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The scope of this paper is to determine the affects that non-petroleum based fuels such as: rapeseed methyl ester (RME) and soy methyl ester (SME) have on thermoset elastomers. The thermoset elastomers that have been evaluated are NBR (Nitrile Butadiene Rubber), NBR/PVC (Nitrile Butadiene Rubber & Polyvinyl Chloride), Epichlorohydrin homo- (Homopolymer of Epichlorohydrin), co- (Copolymer of Epichlorohydrin), ter- (Terpolymer of Ecpichlorohydrin), and Di-, and ter FKM (Fluorinated Rubber). The different elastomers have been subjected to aging in neat fatty acid methyl esters, RME and SME, at a variety of durations and temperatures. The effects of this exposure on the properties of thermoset elastomers are described in this paper.