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. ↑ 1.0 1.1 Erhan, Selim M.; Kleiman, Robert (March 1973). "Factice from oil mixtures". Journal of the American Oil Chemists' Society. 70 (3): 309–311. Retrieved March 16, 2012.
  2. ↑ 2.0 2.1 Simpson, Richard B. (ed.) (2002). Rubber Basics. Rapra Technology Ltd. p. 133. ISBN 1-85957-307-X.