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A roll of plastic wrap

Plastic wrap, cling film, Saran wrap, cling wrap, Glad wrap or food wrap is a thin plastic film typically used for sealing food items in containers to keep them fresh over a longer period of time. Plastic wrap, typically sold on rolls in boxes with a cutting edge, clings to many smooth surfaces and can thus remain tight over the opening of a container without adhesive. Common plastic wrap is roughly 12.7 μm (0.0005 in) thick.[1][2] The trend has been to produce thinner plastic wrap, particularly for household use (where very little stretch is needed), so now the majority of brands on shelves around the world are 8, 9 or 10 μm thick.

Materials used

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Plastic wrap was initially[when?] created from polyvinyl chloride (PVC), which remains the most common component globally. PVC has an acceptably-low permeability to water vapor and oxygen,[3] helping to preserve the freshness of food. There are concerns about the transfer of plasticizers from PVC into food.[citation needed] Pliofilm was made of various kinds of rubber chloride. Used in the middle of the 20th century, it could be heat-sealed.[4]

A common, cheaper alternative to PVC is low-density polyethylene (LDPE). It is less adhesive than PVC, but this can be remedied by adding linear low-density polyethylene (LLDPE), which also increases the film's tensile strength.[5]

In the US and Japan, plastic wrap is sometimes produced using polyvinylidene chloride (PVdC), though some brands, such as Saran wrap, have switched to other formulations due to environmental concerns.[6]

Food use

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Purpose

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Bread wrapped in plastic wrap

The most important role plastic wrap plays in food packaging is protection and preservation. Plastic wrap can prevent food from perishing, extend its shelf-life, and maintain the quality of food. Plastic wrap generally provides protection for food from three aspects: chemical (gases, moisture, and light), biological (microorganisms, insects and animals), and physical (mechanical damage). In addition to food protection and preservation, plastic wrap can also reduce food waste, tag food information, ease the distribution processes, and increase product visibility and microwavability.[7]

Health concern

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Plastic materials are widely used in the food industry due to their low price and convenience; however, there has been an increased health concern because of the possibility of releasing undesirable chemicals from plastic materials into food products. Plastic packages are made of various materials such as polyethylene, low-density polyethylene, etc. Additives, including lubricants, plasticizers, UV-absorbers, colorants, and antioxidants, are added into plastic materials in order to improve the quality and properties of the plastics. Besides, plastic materials are often coated and printed in the final processes, in which inks and varnishes are used. Although the barrier properties of the plastic packages provide protection of foods from external contaminations, the additives and coating materials in the plastic packages are able to penetrate into foods and cause health-related issues.[8]

"It is true that substances used to make plastics can leach into food," says Edward Machuga, Ph.D., a consumer safety officer in the FDA's Center for Food Safety and Applied Nutrition. "But as part of the approval process, the FDA considers the amount of a substance expected to migrate into food and the toxicological concerns about the particular chemical." A couple of cases have caught media attention in recent years. One case is in regard to diethylhexyl adipate (DEHA). DEHA is a plasticizer, a substance added to some plastics in order to make them flexible. There are public concerns about DEHA exposure while consuming food with plastic wraps. There are potentials of exposure to DEHA; however, the levels of the exposure are much lower than the no toxic effect levels in animal studies. Another case is in regard to the dioxins, labeled as "likely human carcinogen" by the Environmental Protection Agency. The public has been misled by the claims that plastics contain dioxins [citation needed], while Machuga stated that no evidence that shows plastic containers or films contain dioxins was seen by the FDA [citation needed]. According to writing in FDA Consumer Magazine as of November 2002, when used properly the use of plastic wrap in food preparation does not pose danger to human health.[9]

Environmental concerns

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The accumulation of plastic debris on the Earth is seen as a threat to both wildlife and the environment. Plastic debris might choke or trap wildlife, and it could also penetrate toxic compounds into ecosystems. This land-originated problem has become a problem in ocean ecosystem as well since streams and rivers which are close to the land have carried the plastic debris into the coast, and currents transfer it to everywhere in the ocean. Plastic debris is a potential danger to all forms of aquatic life. Some marine species, like sea turtles, take plastic as prey items by mistake. Also, some species might even pick up plastics to feed their offspring, which cause huge problems on growth and even cause mortality. Toxic compounds in plastics can disrupt hormone regulation in the cells of organisms, which can lead to alteration of animals' mating behavior, reproductive ability, and even cause the development of tumors.[10]

A study shows that using recycled plastic materials can reduce the environmental impacts significantly as a result of minimizing exploration, mining and transportation of natural gas and oil. One of the possible ways to increase the recycling rate is adding fibrous reinforcement into plastics. The environmental impact has been assessed using the life cycle assessment method. The results showed that plastics with fibrous reinforcement added can sharply reduce resource usage and global warming in civil applications.[11]

Medical use

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See also

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References

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Plastic wrap

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Plastic wrap is a thin, flexible, transparent plastic film primarily used to seal containers and cover food items, thereby preserving freshness by restricting oxygen exposure and moisture loss. It is most commonly manufactured from low-density polyethylene (LDPE) for general food-safe applications or polyvinyl chloride (PVC) enhanced with plasticizers for stronger cling adhesion.[1][2] The material originated from polyvinylidene chloride (PVDC), discovered accidentally in 1933 by Dow Chemical lab worker Ralph Wiley during equipment cleaning, when a residue proved resistant to solvents; this led to the development of Saran Wrap, first commercialized for industrial use in 1949 and households in 1953.[3][4] Widely applied in kitchens for wrapping leftovers, steaming vegetables, and preventing freezer burn, plastic wrap has enabled efficient food storage and reduced spoilage-related waste, though its persistence in the environment raises concerns over microplastic pollution and wildlife entanglement; empirical assessments nonetheless show that such films lower net ecological footprints by curbing food waste emissions relative to less durable alternatives.[1][5][6]

History

Invention and early development

In 1933, Ralph M. Wiley, a laboratory assistant and college student at Dow Chemical Company in Midland, Michigan, accidentally discovered polyvinylidene chloride (PVDC) while cleaning glassware used in experiments related to dry cleaning solvents and adhesives.[7][8] Wiley observed a clear, film-like residue coating the inside of a flask that resisted dissolution in common solvents, prompting further analysis which revealed it as a novel polymer formed from vinylidene chloride monomers.[9][4] This serendipitous finding marked the initial identification of PVDC, distinct from earlier cellulosic films like cellophane, which Swiss chemist Jacques E. Brandenberger had invented in 1908 as a transparent, regenerated cellulose sheet for packaging but lacked inherent adhesiveness and superior chemical stability.[10][11] Early evaluations highlighted PVDC's unique properties, including strong clinginess due to its tacky surface, exceptional resistance to oils, greases, and corrosive chemicals, and high impermeability to gases and moisture—qualities that surpassed cellophane's limitations in barrier performance and durability under varied conditions.[7][8] These attributes stemmed from PVDC's chlorinated structure, which provided denser molecular packing and lower permeability compared to cellophane's more porous, hygroscopic cellulose base.[12] Dow chemists recognized its potential for thin-film applications, initiating laboratory-scale polymerization studies to control the radical-initiated reaction of vinylidene chloride, yielding consistent, flexible sheets rather than brittle residues.[4][8] Through the late 1930s, pre-World War II research at Dow focused on refining PVDC synthesis, including copolymerization techniques to enhance processability and reduce crystallinity for extrudable films, laying the groundwork for scalable thin-film production without immediate commercial intent.[7][8] By 1940, Dow formally registered the polymer, solidifying its foundational role in developing durable, cling-forming wraps superior to wax papers or early cellophane variants in laboratory sealing and containment tests.[8][4]

Commercialization and material shifts

Dow Chemical Company commercialized Saran Wrap in 1949 for industrial applications, followed by its national household launch in 1953 as the first dedicated cling film designed specifically for food preservation. Formulated from polyvinylidene chloride (PVDC), the product offered exceptional adhesion and moisture/oxygen barrier properties, enabling effective sealing of fresh foods and leftovers without refrigeration dependency. Within five years of the consumer rollout, over 200 million rolls were sold, establishing it as a staple in post-World War II kitchens and transforming routine food storage practices.[4][7][8] By the early 2000s, formulations began shifting from PVDC and polyvinyl chloride (PVC) dominance due to escalating processing challenges and regulatory scrutiny of chlorine-containing polymers. In 2004, S.C. Johnson & Son, then owner of the Saran brand, replaced PVDC with low-density polyethylene (LDPE), emphasizing environmental benefits like reduced chlorine emissions during production, though the change compromised original cling strength, heat tolerance, and gas barrier efficacy without substantiating direct health risks from PVDC residues in approved food contact uses. This transition prioritized manufacturability and compliance costs over maintaining superior performance metrics.[13][14][3] Post-2000 adaptations accelerated globally toward non-chlorinated options such as LDPE or linear low-density polyethylene (LLDPE) for broader cost savings in extrusion and recyclability, particularly in North American markets where chlorinated variants faced stricter disposal regulations. Outside the United States, PVC-based films retained prevalence in cling wrap due to their inherent tackiness from plasticizer formulations, sustaining demand in regions with less emphasis on chlorine phase-outs. These material evolutions reflected pragmatic responses to supply chain economics and policy incentives rather than uniform performance mandates.[3][15]

Composition and Production

Primary materials and formulations

Plastic wrap formulations primarily utilize polyvinyl chloride (PVC) as the base polymer, valued for its inherent flexibility, clarity, and cling properties derived from its linear chain structure with polar chlorine atoms.[16] Polyvinylidene chloride (PVDC) serves as a key alternative or blend component, offering superior gas barrier performance with an oxygen permeability coefficient of 1.2 cm³·mm/(m²·24 h·MPa).[17] Low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) are employed in non-PVC variants for their chemical inertness and compatibility with recycling streams.[18] To achieve desired cling and processability, PVC-based formulations incorporate plasticizers such as di(2-ethylhexyl) adipate (DEHA) at concentrations ranging from 22% to 28.3% by weight.[19][20] These additives reduce the glass transition temperature, enabling thin-film extrusion while maintaining adhesion without natural tackiness in pure LDPE or PVDC polymers.[16] Formulations are typically tuned for film thicknesses of 10 to 30 micrometers, balancing tensile strength and barrier efficacy; modern blends often employ co-extrusion of PVC outer layers with PVDC cores to enhance oxygen impermeability while preserving overall flexibility.[21][22]

Manufacturing processes

The manufacturing of plastic wrap primarily relies on extrusion processes, where thermoplastic polymer resins, such as polyvinyl chloride (PVC) or polyethylene (PE), are melted and shaped into continuous thin films. In the standard flat-die extrusion method, resin pellets are fed into a screw extruder, heated to temperatures between 150°C and 250°C to achieve a molten state, and then forced through a narrow flat die to form a thin sheet of uniform thickness, typically ranging from 5 to 20 micrometers. The extruded film is immediately cooled on chilled rollers to solidify it, preventing crystallization and maintaining clarity and flexibility, before being slit into narrower widths and wound onto rolls for further processing or packaging.[23][24] For enhanced barrier properties, co-extrusion techniques are employed to produce multi-layer films by simultaneously melting and extruding different polymer formulations through a multi-manifold die, allowing precise layering of materials like PVC with polyvinylidene chloride (PVDC) or PE to optimize cling, puncture resistance, and gas permeability. This process supports high-throughput production, with modern lines capable of outputs exceeding 500 kg per hour per extruder, facilitating scalability for industrial demands. Blown film extrusion variants, particularly for PVC cling wrap, involve extruding molten polymer through a circular die to form a tube, which is inflated with air, stretched, and cooled to achieve biaxial orientation and superior cling characteristics.[25][26] Post-extrusion quality controls include corona treatment, where the film surface is exposed to a high-voltage electrical discharge in air to generate ozone and reactive species, increasing surface energy from around 30-35 dynes/cm to 38-42 dynes/cm or higher, thereby improving wettability for printing, coating, and lamination without altering bulk properties. Uniformity is ensured through automated gauging and edge trimming, while the thin gauge of the films results in relatively low energy consumption per unit length, often under 5 MJ per kg of output due to efficient heat transfer and minimal material use in high-speed lines. These steps enable consistent production of defect-free rolls suitable for end-use.[27][28]

Physical and Chemical Properties

Key mechanical and barrier properties

Plastic wrap demonstrates tensile strength ranging from 10 to 30 MPa, permitting the film to endure applied stresses during stretching without fracturing.[29] Its elongation at break commonly exceeds 300%, facilitating extensive deformation prior to rupture and contributing to conformability around irregular shapes.[29] Cling adhesion, essential for self-sealing, derives from triboelectric charging in unmodified films or incorporation of tackifying agents, quantifiable via peel force per ASTM D5458 standards.[30] Barrier performance features low oxygen transmission rates, with PVDC formulations achieving values below 1 cc/100 in²/day at 23°C and 0% RH, substantially outperforming waxed paper or uncoated alternatives that exhibit higher gas permeability and thus reduced efficacy against oxidative spoilage.[31] [32] Water vapor transmission rates remain minimal, typically under 5 g/m²/day for common thicknesses, enhancing moisture retention compared to porous paper substrates even when waxed.[33] Thermal stability in PVC-based wraps supports integrity up to 80-100°C, beyond which softening or decomposition risks emerge due to plasticizer volatility and polymer chain scission.[34] Optical properties include high visible light transmittance exceeding 90%, ensuring product visibility while minimizing haze for clarity in packaging inspection.[35]

Variations across material types

Polyvinyl chloride (PVC) films exhibit high cling properties due to inherent electrostatic adhesion, superior stretchability, and flexibility, with tensile strength typically around 20-30 MPa and elongation at break exceeding 200%. These attributes enable thin gauges while maintaining form-fitting coverage, though PVC shows moderate barrier performance with water vapor transmission rates (WVTR) of 5-10 g/m²/day and oxygen transmission rates (OTR) of 500-600 cc/m²/day at standard conditions.[36][37][38] Polyvinylidene chloride (PVDC), frequently incorporated as a coating or layer in multilayer films, delivers the highest barrier efficacy among common plastic wrap polymers, achieving WVTR values below 1 g/m²/day (often 0.05-0.2 g/m²/day for 25 µm thickness) and OTR under 2 cc/m²/day. This stems from its dense, crystalline structure, which restricts gas and moisture permeation more effectively than PVC or polyethylene, albeit with reduced flexibility and higher processing demands.[39][40] Low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) prioritize mechanical robustness, with LLDPE offering tensile strengths of 20-40 MPa, superior puncture resistance, and elongation comparable to PVC but lower cling reliant on additives. Barrier properties are inferior, registering WVTR of 10-30 g/m²/day and OTR of 2000-8000 cc/m²/day, often requiring increased film thickness (e.g., 50-100% thicker than PVC equivalents) to approximate similar protection levels.[36][41][42]
MaterialWVTR (g/m²/day)OTR (cc/m²/day)Tensile Strength (MPa)Elongation at Break (%)
PVC5-10500-60020-30>200
PVDC<1<240-50100-200
LDPE/LLDPE10-302000-800020-40300-600
These variations necessitate trade-offs: PVC balances cling and economics with adequate barriers, PVDC excels in impermeability for demanding preservation but at elevated cost, and polyethylene variants emphasize durability and processability despite permeation limitations.[36][39][37]

Applications

Food packaging and preservation

Plastic wrap functions primarily as a barrier in food packaging by sealing out oxygen, moisture, and airborne contaminants, thereby inhibiting oxidation, dehydration, and microbial proliferation that accelerate spoilage.[43] This mechanism is particularly effective for perishable items stored under refrigeration or freezing conditions, where it maintains product integrity by minimizing exposure to environmental factors that degrade quality.[44] Empirical studies demonstrate its preservation efficacy; for instance, in the supply chain for cucumbers imported from Spain to Switzerland, plastic wrapping reduces retail-level food losses by 4.8 percentage points, from 9.4% to 4.6% of total volume.[45] Similarly, for meats and cheeses, the cling properties of plastic wrap limit surface drying and lipid oxidation compared to uncovered alternatives, supporting extended refrigerated storage without compromising texture or flavor.[46] Introduced commercially in the mid-20th century, plastic wrap gained global adoption post-1950s amid rising household refrigeration and consumer demand for convenient preservation methods.[8] It is available in versatile formats, including continuous rolls with integrated dispensers for home and professional kitchens, and pre-cut perforated sheets for quick retail wrapping of sandwiches, produce, or deli items.[47][48] These options facilitate airtight coverage tailored to varying food shapes and sizes, enhancing usability in both domestic and commercial settings.[49]

Industrial and protective uses

Stretch film variants of plastic wrap are extensively used in logistics for palletizing goods, where the material is stretched and applied around stacked loads to provide unitization, stability, and resistance to tampering or shifting during transit. This application reduces product damage by up to 50% in some shipping scenarios through load containment and cushioning against vibrations and impacts.[50] [51] The film's high elongation—at rates exceeding 200%—allows it to conform tightly to irregular shapes, with common thicknesses ranging from 12 to 25 microns for optimal tension without film breakage.[52] In manufacturing and construction, plastic films function as temporary protective barriers over equipment, components, and surfaces to prevent contamination from dust, moisture, or construction debris. Polyethylene-based films, often 50-100 microns thick, are selected for their conformability and low-tack adhesives that avoid residue upon removal, enabling use on metals, plastics, and glass during fabrication, transport, or site work.[53] [54] These coverings withstand environmental exposure for periods up to several months, with tear resistance exceeding 100 N/mm in high-duty formulations.[55] Agricultural applications include silage wrapping, where multi-layer plastic films—typically 25 microns thick and composed of linear low-density polyethylene—encase baled forage crops to establish anaerobic conditions for lactic acid fermentation, thereby inhibiting aerobic spoilage and preserving protein content at levels above 90% of fresh values.[56] Four to six overlapping layers are standard to achieve oxygen permeability below 50 cm³/m²/day, with UV stabilizers extending field durability to 12 months or more.[57] [58] This method supports bulk fodder storage, reducing dry matter losses to under 5% compared to unwrapped methods.[59]

Medical and sterile applications

Cling film, particularly polyethylene variants, is employed in healthcare for secondary packaging of sterile medical supplies, including bandages, gauze pads, and dressings, where its tight adherence and barrier qualities help preserve sterility against environmental contaminants during storage and transport. Market analyses indicate this usage stems from the film's ability to form a conformal seal that minimizes microbial ingress without requiring specialized equipment.[60][61] In wound management, plastic wrap serves as a temporary protective cover over dressings to shield sites from water and debris during activities like showering, enabling visibility of the wound while maintaining a moist environment conducive to healing. Clinical recommendations from reconstructive surgery contexts endorse this practice for short-term use, citing the material's impermeability to liquids and ease of application. Evaluations of specific products, such as Press'n Seal cling film, have verified its capacity to retain sterility in intraoperative settings like hyperthermia treatments, attributing efficacy to properties including surface adhesion, optical clarity, and thermal retention, with no contamination observed in sterility tests.[62][63] Adoption in sterile applications remains constrained by the need for biocompatibility validation under standards like ISO 10993, which mandates tests for cytotoxicity, sensitization, and irritation to confirm suitability for skin-contact devices. Polyethylene-based films, often breathable to permit moisture vapor transmission, undergo these assessments to mitigate risks of adverse tissue reactions, ensuring limited but targeted deployment in non-invasive roles such as instrument overwraps or procedural barriers rather than primary surgical drapes.[64][65]

Benefits and Impacts

Reduction of food waste and economic efficiency

Plastic wrap contributes to the reduction of food waste primarily by forming an airtight barrier that limits oxygen ingress, moisture loss, and microbial contamination, thereby extending the shelf life of perishable foods such as fruits, vegetables, meats, and baked goods. Empirical studies demonstrate this effect on specific items; for example, wrapping guava fruits individually in cling film extended marketable shelf life from 6 days at ambient temperature for unwrapped samples to 12 days, with reduced weight loss and decay incidence. Similarly, cling film wrapping of cauliflower curds maintained firmness, minimized weight loss (under 5% over 10 days at 5°C), and lowered respiration rates compared to unwrapped controls, preserving quality for retail and consumer use. [66] [67] On a broader scale, flexible plastic films like those used in wrap applications enable packaging innovations that prevent substantial food losses in supply chains. In the United States, where approximately 60 million tons of food are wasted annually—equivalent to 40% of the food supply—strategies incorporating improved plastic packaging design could divert over 1 million tons of surplus food from waste each year by optimizing portion sizes, enhancing barrier properties, and delaying spoilage. This waste avoidance equates to avoiding economic losses valued in billions, given that U.S. food waste carries an estimated annual cost of $218 billion in retail, wholesale, and consumer expenses. [68] [69] Plastic wrap's economic efficiency stems from its minimal material requirements and low production costs relative to the value preserved. Typically consisting of thin polyethylene or polyvinyl chloride films (8-20 microns thick), it uses grams of material per application while outperforming heavier alternatives like glass or metal in weight reduction and transport efficiency, lowering logistics expenses in global food distribution. Economic analyses indicate that the value recovered from averted food spoilage—factoring in production, retail, and disposal savings—exceeds packaging costs by factors of 2 to 10 in modeled scenarios for perishables, as the high embedded value of food (often $1,000+ per ton) dwarfs the fractional cent per unit cost of wrap. [70] [71]

Contributions to food security and supply chain

Plastic wrap, as a form of flexible plastic film, facilitates the extension of shelf life for perishable foods during transportation, enabling the distribution of fresh produce over extended distances and supporting international trade in agricultural goods. This preservation capability reduces spoilage rates, which is particularly vital in developing countries where infrastructure limitations exacerbate post-harvest losses; for instance, plastic packaging protects against contamination and physical damage, ensuring safer and more efficient global exports of items like fruits and vegetables.[72][73] In regions with variable climates and longer supply chains, such as parts of Africa and Asia, this contributes to stabilizing food availability by minimizing losses estimated at 20-40% for certain commodities without adequate barriers.[74] At the consumer level, plastic wrap enables household-level food preservation, allowing low-income families to store leftovers or bulk purchases longer, thereby decreasing the need for frequent grocery trips and associated transportation costs. By creating an airtight seal that limits exposure to oxygen and moisture—key factors in oxidation and microbial growth—this application supports portion control and extends usability of affordable proteins and produce, indirectly bolstering access in resource-constrained settings.[1][75] The broader flexible packaging films sector, encompassing plastic wrap, underscores its economic role in food supply chains, with the global market valued at $291.56 billion in 2024 and projected to reach $368.82 billion by 2029, driven by demand for efficient preservation technologies that enhance distribution resilience and market access.[76] This scale reflects investments in materials that prioritize barrier properties, fostering supply chain vitality amid rising global food demands.[71]

Health Considerations

Potential chemical migration and exposure pathways

Chemical migration from plastic wrap primarily occurs through direct contact with food, where additives such as di(2-ethylhexyl) adipate (DEHA), a common plasticizer in polyvinyl chloride (PVC)-based films, leach into the contacted material.[77] This process is diffusion-driven, with DEHA partitioning from the polymer matrix into food simulants or fatty matrices, as DEHA's solubility in lipids facilitates transfer.[77] Studies have quantified DEHA migration from PVC films containing approximately 28% DEHA, yielding levels up to 18.9 mg per square decimeter of film surface under contact conditions.[77] Migration rates increase significantly under thermal stress, such as temperatures above 100°C, or in the presence of high-fat foods, which act as solvents for lipophilic additives.[78] For instance, experimental contact with meats resulted in DEHA concentrations of 49 to 151 mg/kg in the food matrix, particularly when films were applied during heating or storage of lipid-rich products like cheeses.[77] [79] Phthalate plasticizers, though less prevalent in food-grade PVC wraps due to regulatory preferences for alternatives like DEHA, can similarly migrate under analogous conditions if present in non-compliant or older formulations.[80] Microplastic shedding represents another exposure pathway, arising from mechanical wear, abrasion, or thermal degradation of the film during handling, cutting, or wrapping.[81] Particles generated this way, typically in the micro- to nanometer range, can transfer directly to food surfaces via physical contact or become airborne for potential inhalation, with detected quantities in food contact scenarios on the order of nanograms per gram.[82] Heat exposure, including non-microwave sources like hot food wrapping, exacerbates fragmentation and release.[83] Indirect pathways include trace incorporation via recycled content in downstream packaging, where residual additives persist through processing.[84] Volatilization of additives from plastic wrap remains insignificant at room temperature, as these compounds exhibit low vapor pressure under ambient conditions, limiting gaseous exposure routes.[85] Primary human exposure thus stems from ingestion during consumption of wrapped foods, with dermal or respiratory uptake secondary and minimal in typical domestic use.[86]

Empirical evidence on risks and regulatory evaluations

Animal studies have demonstrated that high-dose exposure to phthalates like di(2-ethylhexyl) phthalate (DEHP), commonly used in polyvinyl chloride (PVC) plastic wrap, can induce endocrine disruption, including reproductive toxicity and developmental effects in rodents.[87] However, these effects occur at doses orders of magnitude higher than typical human exposure levels from food contact materials, and direct extrapolation to humans remains limited due to species differences in metabolism and sensitivity.[88] Human epidemiological studies report associations between urinary phthalate metabolites and outcomes such as reduced semen quality, altered neurodevelopment, and increased childhood asthma risk, but evidence of causation specifically from plastic wrap exposure is weak, confounded by multi-source exposures (e.g., cosmetics, medical devices) and lacking randomized controlled trials (RCTs) to establish dose-response causality at consumer levels.[89] For instance, meta-analyses of prenatal DEHP exposure show inconsistent reproductive outcomes in humans compared to robust animal data, with no clear links to diabetes, cancer, or cardiovascular disease directly attributable to cling film use.[90] Recent 2021-2025 cohort studies detecting phthalates in blood or linking broad exposure to heart disease mortality (e.g., estimating 91,000-107,000 U.S. premature deaths annually) fail to isolate plastic wrap as a causal vector and rely on observational correlations without mechanistic proof at low doses.[91][92] Regulatory bodies evaluate risks based on migration limits and toxicological thresholds. The U.S. FDA permits specific phthalates in food contact substances, including plastic wrap, with overall migration not exceeding safe intake levels derived from no-observed-adverse-effect levels (NOAELs) in animal data, affirming compliance for non-thermal uses like room-temperature wrapping.[93] In the EU, Regulation (EU) No 10/2011 sets specific migration limits (SML) for phthalates such as DEHP at 1.5 mg/kg food, alongside an overall migration limit of 60 mg/kg, with amendments through 2023 tightening restrictions while allowing authorized uses; evaluations conclude that approved levels pose negligible risk under intended conditions.[94] These thresholds incorporate uncertainty factors (e.g., 100-fold for interspecies extrapolation) and prioritize empirical toxicology over precautionary assumptions, reflecting that detected exposures from compliant packaging do not exceed reference doses associated with harm.[95] Overall assessments indicate that while phthalate detection in human biomonitoring confirms ubiquitous low-level exposure, robust causal evidence tying typical plastic wrap use to adverse health outcomes is absent, with hygiene and contamination prevention benefits empirically outweighing hypothetical risks in population-level data.[96] No large-scale RCTs or longitudinal studies have demonstrated elevated disease incidence from standard consumer practices, underscoring regulatory confidence in current limits despite ongoing surveillance.[97]

Environmental Evaluation

Lifecycle assessments and comparative impacts

Lifecycle assessments (LCAs) of plastic wrap, primarily polyethylene (PE) films, evaluate cradle-to-grave environmental impacts, including raw material extraction, production, use-phase benefits from food preservation, and end-of-life disposal. These analyses often employ functional units such as kilograms of food protected or volume packaged to account for performance differences across materials. When incorporating food waste avoidance—where plastic wrap extends shelf life and reduces spoilage—PE films demonstrate net environmental advantages over alternatives like paper, glass, or aluminum in greenhouse gas (GHG) emissions and energy use.[98][99] A 2025 comparative LCA of PE packaging versus paper, glass, aluminum, and steel alternatives across multiple applications found average global warming potential (GWP) savings of approximately 70% for PE, driven by lower fossil energy demand and reduced food waste emissions. This holds particularly for flexible films used in food wrapping, where the lightweight nature of PE (density ~0.92 g/cm³) minimizes material inputs compared to denser substitutes like glass (2.5 g/cm³). Production energy for PE films is around 70-80 MJ/kg, but per functional unit of preserved food, it yields lower total impacts due to superior barrier properties that cut downstream waste-related methane and transport emissions.[100][101] Specific case studies reinforce these findings; for instance, wrapping cucumbers in thin PE film versus loose storage results in a net positive environmental balance, as the packaging prevents dehydration and spoilage, avoiding GHG emissions equivalent to 2-3 times the film's production footprint over the product's lifecycle. Broader meta-analyses of LCAs confirm that flexible plastic packaging outperforms rigid formats (e.g., bottles or trays) in 80% of impact categories, including eutrophication and acidification, when use-phase efficiencies are factored in. These outcomes challenge narratives emphasizing only production-phase burdens, as full-system evaluations reveal plastics' role in offsetting higher impacts from alternative materials' greater weight and poorer preservation efficacy.[98][102]

Waste accumulation, recycling, and degradation

Plastic wrap, primarily composed of low-density polyethylene (LDPE) films, contributes to waste streams dominated by landfill disposal and incineration, with approximately 85-90% of post-consumer plastic waste in the United States directed to these fates rather than recycling.[103][104] Flexible films like plastic wrap face structural barriers to diversion, including their low bulk density and tendency to entangle in processing machinery, exacerbating accumulation in municipal solid waste.[105][106] Recycling rates for plastic films remain below 10%, often cited at around 2-3% for flexible packaging, due to persistent contamination from food residues and the material's flexibility, which hinders sorting and mechanical separation at scale.[107][108] In practice, clean LDPE films from industrial sources can achieve higher recovery through dedicated streams, but post-consumer plastic wrap typically enters mixed waste, leading to rejection in curbside programs and dominance of landfilling or energy recovery via incineration, where plastics constituted 16.3% of combusted municipal solid waste in 2018.[109][110] These challenges stem from economic factors, such as low market value for recycled LDPE and high processing costs relative to virgin material.[111] LDPE in plastic wrap is non-biodegradable under typical environmental conditions, persisting as an inert material with degradation rates on the order of decades to centuries via slow photo-oxidation and minimal biological breakdown, without significant greenhouse gas emissions in landfills.[112] While fragmentation can produce microplastics, contributions from plastic packaging are dwarfed by dominant sources like tire wear particles, which account for up to 45% of total microplastics in terrestrial and aquatic environments.[113][114] Recent mechanical recycling advancements, including pilot programs from 2023 onward, have targeted clean LDPE films through improved sorting and compatibilization techniques, yielding up to 50% material recovery in optimized processes by reducing contamination losses and enhancing pellet quality for reuse.[115] These efforts, often involving enzymatic or advanced washing pretreatments, demonstrate potential for higher efficiency in controlled streams but remain limited for contaminated consumer waste like used plastic wrap.[116]

Policy responses, bans, and alternative materials

In response to environmental concerns over plastic waste, the European Union enacted the Single-Use Plastics Directive (Directive (EU) 2019/904) in 2021, which prohibits or restricts certain single-use plastic items while mandating reductions in others, including plastic films used in packaging; however, essential food wraps like cling film receive exemptions due to their role in preventing spoilage.[117] The forthcoming Packaging and Packaging Waste Regulation (PPWR), proposed in 2022 and advancing toward 2030 implementation, targets bans on single-use plastic packaging for most fresh produce, though flexible films for direct food contact remain partially exempt to avoid supply chain disruptions.[118] In the United States, the voluntary U.S. Plastics Pact outlines 2025 targets for 100% of plastic packaging to be reusable, recyclable, or compostable, alongside efforts to recycle or compost 50% of plastic packaging, but progress reports indicate these goals will likely be unmet due to infrastructure limitations.[119][120] Proposed alternatives to conventional plastic wrap, such as bio-based polyethylene (bio-PE) and polylactic acid (PLA) films, aim to reduce fossil fuel dependency but often entail 20-50% higher production costs and exhibit inferior oxygen and moisture barriers compared to petroleum-based options, per life cycle assessments (LCAs).[121] LCAs reveal that while bio-PE may lower certain impacts like fossil resource use, PLA films frequently yield higher greenhouse gas emissions during production and disposal, especially if composting infrastructure is absent, and their reduced durability can accelerate food spoilage, negating environmental gains.[122] In scenarios where alternatives replace plastics without addressing barrier shortcomings, net waste increases, as evidenced by studies showing plastic films' superior performance in minimizing lifecycle emissions for food preservation applications.[121] Empirical data on plastic bans highlights trade-offs, with restrictions on packaging leading to faster produce spoilage and elevated food waste; for instance, unwrapped fruits and vegetables exhibit 2-3 times higher spoilage rates, driving up replacement production and associated emissions from agriculture and transport.[123] Analyses of bag bans, analogous to film restrictions, demonstrate unintended rises in total waste volumes and consumer costs, as thicker "reusable" substitutes generate more material per use without proportional recycling gains.[124] These outcomes underscore the limitations of precautionary bans, which prioritize waste avoidance over comprehensive evidence; market-driven innovations in recycling and hybrid materials, rather than mandates, better align with causal reductions in net environmental harm by preserving plastics' efficiency in curbing food loss.[125]

References

  1. Packaging – Plastic Wrap - Center for Research on Ingredient Safety
  2. What Is Plastic Wrap Made Of Materials Uses And Safety Guide
  3. https://uspackagingandwrapping.com/plastic-wrap-101.html
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  7. 1953 Saran Wrap® ad | Vintage Ads | History - Dow Corporate
  8. The Inventor of Saran Wrap - ThoughtCo
  9. The Right Chemistry: Dry cleaning research led to Saran wrap
  10. Sealed with a Wrap | Science History Institute
  11. History of Cellophane - Bioplastics News
  12. The sticky problem of plastic wrap - National Geographic
  13. Saran Wrap Isn't What It Used To Be - Shuttersparks
  14. Why Today's Saran Wrap Is Less Sticky - Taste of Home
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  19. Screening Assessment for the Challenge - Canada.ca
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  21. https://www.packagingsuppliesbymail.com/blog/post/micron-mil-and-gauge
  22. PVC-PVDC-Cling-Film-Extrusion-Line
  23. What is Plastic Extrusion? (A Definitive Process Guide) - TWI Global
  24. The Plastic Extrusion Process Explained - Lakeland Plastics
  25. PVC Cling Film Extrusion Production Line Machine - Benk Machinery
  26. What Is Co-extruded Film? - Polyflex - Industrial Polythene - UK.COM
  27. Why do I need corona treating and how do corona treaters work?
  28. Film Extrusion - Corona, Plasma and Flame Surface Treating
  29. PVC Cling | DINGSHENG
  30. ASTM D5458 Peel Cling of Stretch Wrap Film How to Guide - ADMET
  31. Metallized vs PVDC-Coated Polyester: Which Barrier Wins?
  32. Paper-based products as promising substitutes for plastics in the ...
  33. Wax Coatings for Paper Packaging Applications: Study of the ... - NIH
  34. What Are the Properties of PVC Film - HYF
  35. Transparency of polymeric food packaging materials - ScienceDirect
  36. Comparison of Packaging Films Based on Oxygen (OTR) and Water ...
  37. Comparison of PVC Cling Film and PE Cling Film - Eming
  38. Difference Between PVC & PE Cling Film
  39. https://www.sorbentsystems.com/barrier_film_properties.htm
  40. OTR & WVTR - Key Barrier Indices in Plastic Packaging - VICHEM
  41. Polyethylene Film - an overview | ScienceDirect Topics
  42. Understanding HDPE, LLDPE, LDPE, PP, PVC, PS, PET, and EVA
  43. Plastic Packaging for Food and the Science of Shelf Life
  44. Progresses in Food Packaging, Food Quality, and Safety ... - NIH
  45. To Wrap Or to Not Wrap Cucumbers? - Frontiers
  46. Impact of Packaging Materials on Food Safety and Shelf Life
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  48. Restaurantware 9.75 Inch Plastic Food Wraps, 100 Pre-Cut Plastic ...
  49. https://uspackagingandwrapping.com/perforated-wrap-dispenser.html
  50. https://uspackagingandwrapping.com/stretch-wrap-101.html
  51. Stretch Wrap Market Size, Share, Trends | Growth Report [2032]
  52. The Complete Guide To Stretch Film For Shipping Protection
  53. Construction Film - Protects Surface from Paint, Water, Dust
  54. Protection films for plastic sheets - Polifilm
  55. Temporary protective films for plastic parts and surfaces | Pregis
  56. What is Silage Wrap? - Western Packaging
  57. Use Silage Plastic Film and Get Best Quality Silage - SILOPAK
  58. Bale Wrap | Products - Trioworld
  59. https://eyouagro.com/blog/tear-resistance-in-silage-film/
  60. Cling Films Market Size And Share | Industry Report, 2030
  61. Cling Films Market Size to Reach USD 8.22 Billion by 2031
  62. PROTECTION OF DRESSINGS AND WOUNDS BY CLING FILM
  63. Evaluation of the Sterility of Press'n Seal Cling Film for Use in ... - NIH
  64. [PDF] Use of International Standard ISO 10993-1, "Biological evaluation of ...
  65. Toxic or not toxic? The specifications of the standard ISO 10993-5 ...
  66. Extension of the shelf life of guava by individual packaging with cling ...
  67. EFFECT OF CLING FILM WRAPPING ON EXTENDING THE SHELF ...
  68. Food Waste in America in 2025: Statistics & Facts | RTS
  69. How to Design Packaging to Prevent Food Waste - ReFED, Inc
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  71. The Role of Plastic Flexible Films in Reducing Food Waste
  72. [PDF] Plastic substitution in developing countries - UNCTAD
  73. Why some plastic packaging is necessary to prevent food waste and ...
  74. [PDF] Appropriate food packaging solutions for developing countries
  75. Advantages of Plastic Food Packaging: An In-Depth Look at Daily Use
  76. Flexible Packaging Market Size Forecast [Latest] - MarketsandMarkets
  77. Migration of di(2-ethylhexyl) adipate and acetyltributyl citrate ...
  78. Are Dangerous Chemicals Getting into Your Food from Plastic ...
  79. Migration of di-(2-ethylhexylexyl)Adipate Plasticizer from Food ...
  80. Leaching of Phthalates from Medical Supplies and Their ... - NIH
  81. A systematic review of microplastics emissions in kitchens
  82. Beyond the food on your plate: Investigating sources of microplastic ...
  83. Studies show how microplastics from packaging get into our food
  84. Migration of phthalate and non-phthalate plasticizers from polyvinyl ...
  85. Migration of Chemical Compounds from Packaging Materials ... - MDPI
  86. Microplastics Exposure Routes and Toxicity Studies to Ecosystems
  87. Systematic reviews and meta-analyses of human and animal ... - NIH
  88. Phthalates and Their Impacts on Human Health - PMC - NIH
  89. Human health impacts of exposure to phthalate plasticizers
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  91. Phthalate exposure from plastics and cardiovascular disease: global ...
  92. What We Know About Phthalates in Plastic and Heart Disease
  93. Phthalates in Food Packaging and Food Contact Applications - FDA
  94. 16th amendment to EU Regulation 10/2011 on plastic FCMs now in ...
  95. Update on Phthalates in Food Packaging and Food Contact ... - FDA
  96. Evidence for widespread human exposure to food contact chemicals
  97. Health impacts of exposure to synthetic chemicals in food - PMC - NIH
  98. Replacing Plastics with Alternatives Is Worse for Greenhouse Gas ...
  99. [PDF] Life Cycle Impacts of Plastic Packaging Compared To Substitutes in ...
  100. Certain packaging materials can show 70% lower emissions than ...
  101. Polyethylene packaging shows average 70% lower emissions than ...
  102. A scoping review of food packaging life cycle assessments that ...
  103. At Least 85 Percent of U.S. Plastic Waste Went to Landfills in 2021
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  106. Why Recycling Plastic Film is Challenging (and Why We Do it Anyway)
  107. Implications of scale up flexible plastic packaging recycling in the ...
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  109. America Recycles Day: Package Recycling Stats by the Numbers
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  111. The Challenges of Recycling LDPE: What You Need to Know
  112. Degradation Rates of Plastics in the Environment - ACS Publications
  113. Recent developments in bio-based polyethylene: Degradation ... - NIH
  114. One of the biggest microplastic pollution sources isn't straws ... - PBS
  115. (PDF) Technological Advances in Mechanical Recycling Innovations ...
  116. Life cycle assessment of mechanical recycling of low-density ...
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  118. PPWR and the End of Single-Use Packaging - SGS Digicomply
  119. [PDF] Roadmap to 2025 - U.S. Plastics Pact
  120. U.S. Plastics Pact to miss all 2025 commitments
  121. Replacing Plastics with Alternatives Is Worse for Greenhouse Gas ...
  122. Life cycle assessment of polyethylene packaging and alternatives ...
  123. Opinion: Banning plastic food packaging would be a second big ...
  124. California Is Throwing Away More Plastic After It Banned Plastic Bags
  125. Environmental impact of biodegradable food packaging when ...
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