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Message: [QUOTE="tpbeebejr, post: 1432342, member: 124429"] Rich, you are right on all counts. I study polymers as part of my research and indeed one must match the o-ring material to the application. Viton is excellent for its chemical resistance to petroleum-based fuels, as is BUNA-nitrile at about half the cost. The PDF that I referred to above is now ready for posting, but I was disappointed to find that the size limit for PDF files here is 73kB or something incredibly small. Can I please send you my PDF file (1.7 MB) so that you can read it and decide if it is useful for this forum? Then you can use your administrator privileges to override the posting limit if you see fit. Please tell me how I can send the file to you. Thanks, Tom (tpbeebejr) [/QUOTE]