Saran film

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Polyvinylidene chloride film

Description

Originally a Dow Chemical tradename for thermoplastic film copolymer of vinylidene chloride and small amounts of vinyl chloride or acrylonitrile. Polyvinylidene, or PVDC, was discovered by accident in 1933, by Ralph Wiley a college student working at Dow. The name Saran was trademarked by Dow Chemical in 1940, but is now a commonly used name for thin polyvinylidene chloride films and fibers. The PVDC films haves very low water permeability and is very inert. It has good chemical resistance to acids and alkalis and does not lose strength in sunlight. Saran plastic is used for fibers, packaging films and acid-resistant pipes. Due to costs, many plastic films currently sold for food packaging are composed of polyethylene.

Synonyms and Related Terms

Saran Wrap [Dow Chemical]

FTIR

Saranfiberkj1.jpg

FTIR

Saran Fiber.jpg

Properties

Resistant to acids, alkalis. May be damaged by ketone, carbon tetrachloride, ethanol, perchloroethylene Resistant to insects and bacteria.

For 1 mil film: Oxygen transmission = 12-16 ml/m2d; Water vapor transmission = 3.8 g/m2d

Melting Point 160-177
Density 1.17

Hazards and Safety

Nonflammable.

Additional Information

° Dow Chemical: Website ° The History of Saran Wrap: Website

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 850
  • Rosalie Rosso King, Textile Identification, Conservation, and Preservation, Noyes Publications, Park Ridge, NJ, 1985
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002