Factice

Factice is vulcanized unsaturated vegetable or animal oil, used as a processing aid and property modifier in rubber.

Longer chain fatty-acid containing oils such as rapeseed or meadowfoam produce a harder, more desirable factice. Soybean oil produces lower quality factice, though it can be mixed with longer-chain oils to yield factice nearly as good as that made from long chain oils alone.[1] Oil-resistant factice is made with castor oil.[2]

Cross-linking the fatty-acid chains with sulfur (brown factice) or S2Cl2 (white factice) yields a rubbery material that improves the processing characteristics and ozone resistance of rubber.[1] Varying the amount of factice changes the physical properties of the rubber; molded items might be 5-10% factice, extrusions 15-30%. Rubber erasers can have as much as 4 times as much factice as rubber in their composition.[2]

References
  1. Erhan, Selim M.; Kleiman, Robert (March 1973). "Factice from oil mixtures". Journal of the American Oil Chemists' Society. 70 (3): 309–311. doi:10.1007/bf02545313. S2CID 95493744. Retrieved March 16, 2012.
  2. Simpson, Richard B., ed. (2002). Rubber Basics. Rapra Technology Ltd. pp. 133. ISBN 1-85957-307-X.
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