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Thank you both. With that and the other information I found on my own, I'm seeing these as "common", some obviously more so than others: NBR, dramatically varying grades/quality levels, some interact poorly with a variety of common fluids HNBR Polyurethane Viton, in areas known to run hot PTFE...

Hey, first post for me, let’s see what comes of it… I want to know what seal materials are the most common in new farm equipment’s hydraulic systems and transmissions. NBR? Viton? Polyurethane? I can make an educated guess, but hopefully some of you have real knowledge. Other surfaces that...