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Viton has low gas permeability. This property makes it a good selection for high vacuum applications. This fluorocarbon has excellent chemical resistance over a wide temperature range (-20 C to 200 C). Resists aliphatic and aromatic compounds, but not recommended for use with ketones, esters and ethers. Viton is a copolymer of hexafluoropropylene and 1,1-difluoroethylene and has good mechanical and electrical properties.