Evaluation of the Chemical Resistance of Epichlorohydrin and Fluorocarbon Elastomers to Hydrocarbon Fill Fluids
DEFENCE RESEARCH ESTABLISHMENT ATLANTICDARTMOUTH (NOVA SCOTIA)
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The chemical resistance of an epichlorohydrin elastomer and three fluorocarbon elastomers to Bayol 35, Voltesso 35, and Marcol 72 hydrocarbon fill fluids has been investigated. Absorption of fill fluid and the resulting change in the glass transition temperature were used to evaluate the chemical resistance of the elastomers. The weight change of the fluorocarbon elastomers was less than 0.1 by weight indicating that these elastomers have excellent chemical resistance to the fluids. The epichlorohydrin elastomer absorbed approximately 0.6 Bayol 35, 2.0 Voltesso 35, and 3.25 Marcol 72 and the Tg of the epichlorohydrin elastomer decreased slightly following immersion in the fill fluids. This elastomer has good to excellent resistance to the fill fluids. The Tg of the four elastomers studied here are high enough to cause concern about these elastomers undergoing a rubber to glass transition in low temperature, high frequency applications. Epichlorohydrin based copolymer or terpolymer elastomers have lower Tgs and should remain rubbery at low temperature and higher frequencies. Evaluation of these elastomers is warranted.
- Elastomers and Rubber