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| Saran Wrap | |
|---|---|
| Name | Saran Wrap |
| Caption | Saran brand plastic wrap roll |
| Type | Cling film |
| Current owner | Dow Chemical Company |
| Origin | United States |
| Introduced | 1949 |
| Markets | Worldwide |
Saran Wrap is a brand of thin, clear plastic film primarily used for sealing food containers and preserving perishable items. Introduced in the mid-20th century, it became a common household product associated with home economics, kitchenware, and food storage. The product has featured in discussions involving industrial chemistry, consumer safety, and environmental regulation.
Saran Wrap was developed from wartime research into polymers and film technology by scientists linked to Dow Chemical Company and associated research programs influenced by innovations at DuPont and laboratories collaborating with United States Department of Defense initiatives. Early commercial rollout occurred in the post-World War II era amid consumer shifts documented alongside figures such as Betty Crocker and institutions like Good Housekeeping. Marketing and distribution networks expanded through partnerships with retailers exemplified by Sears, Roebuck and Co. and grocery chains such as Safeway Inc. and A&P. Over subsequent decades, changes in corporate ownership, trade policy debates involving North American Free Trade Agreement and product standards influenced manufacturing locations and global sales strategies involving multinational corporations like 3M and chemical industry associations such as the American Chemistry Council.
The original formulation used polyvinylidene chloride (PVDC), synthesized from the monomer vinylidene chloride produced by petrochemical processes tied to feedstocks from companies such as ExxonMobil and refinery suppliers associated with Shell plc. PVDC film production involved polymerization reactors and film-extrusion lines similar to equipment supplied by manufacturers like Brückner Group and Hosokawa Micron. Later formulations transitioned toward low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) matrices with cling additives due to supply-chain and regulatory pressures intersecting with standards from agencies such as the U.S. Food and Drug Administration and trade groups including International Organization for Standardization. Additives and processing aids supplied by specialty chemical firms like BASF and AkzoNobel adjusted film clarity, tensile strength, and barrier properties. Quality control incorporated testing protocols influenced by standards promulgated by organizations such as ASTM International.
The film exhibits properties governed by polymer chemistry explored in contexts like research at Massachusetts Institute of Technology, California Institute of Technology, and industrial labs at DuPont Central Research. Key characteristics include optical clarity, oxygen and moisture barrier performance, puncture and tear resistance, and surface tackiness resulting from polymer polarity and processing conditions investigated in publications associated with American Chemical Society journals. PVDC variants provided superior barrier performance against oxygen and aroma compared with polyethylene lipids, influencing shelf-life extension studies observed in collaborations with institutions such as Cornell University and University of California, Davis. Thermal behavior, including melt temperature and softening point, relates to analytical methods used at facilities such as National Institute of Standards and Technology and in instrumental analyses by companies like Thermo Fisher Scientific.
Primary applications remain in food preservation and short-term storage in households, restaurants, and institutions including university dining services at Harvard University and hospital food services affiliated with Mayo Clinic. Commercial uses include packaging for bakeries, delis, and produce supply chains managed by firms such as Sysco Corporation and US Foods. Beyond food, specialized film variations serve in industrial contexts for protective overwrap in electronics distribution channels managed by companies like Apple Inc. and Intel Corporation, and in laboratory settings for sealing containers in research at institutions such as National Institutes of Health and Lawrence Berkeley National Laboratory.
Health considerations have centered on potential migration of monomers, additives, and plasticizers under heat or solvent exposure, topics examined by regulatory bodies including the U.S. Food and Drug Administration, European Food Safety Authority, and public health researchers at World Health Organization. Consumer advisories from agencies like Food and Drug Administration and public-interest groups such as Consumer Reports recommend avoiding direct contact with hot surfaces or use in microwave heating beyond manufacturer guidelines to minimize migration risks. Occupational safety in manufacturing aligns with standards from Occupational Safety and Health Administration and industry best practices promoted by entities such as National Safety Council.
Environmental assessments reference lifecycle analyses conducted by universities such as Stanford University and agencies including Environmental Protection Agency, addressing persistence of synthetic polymers, microplastic generation studied by researchers at Scripps Institution of Oceanography, and waste management practices coordinated with municipal authorities exemplified by New York City Department of Sanitation. Recycling streams often exclude cling films in curbside programs administered by organizations like Waste Management, Inc., prompting collection programs and film recycling initiatives run by retailers such as Walmart and Target Corporation in partnership with recycling companies like Trex Company. Regulatory frameworks, corporate sustainability commitments by firms like Dow Inc., and international agreements on plastics pollution such as discussions at United Nations Environment Programme influence material substitution, compostability research, and producer responsibility schemes.
Category:Packaging materials