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]
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
Hazards and Safety
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
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Saran_%28plastic%29 (Accessed Sept. 14, 2005)