It has been 20+ years since I worked with Disogrin so memory is very faded but if memory is correct it was less pliable than buna n but did have some memory and would return to size after being stretched.
If I was you I would take the time to go to a place that sells hydraulic seals. Trying to figure out a seal just by its color is no the best way to go. For example, Buna-n and EPDM are both black. Plus, even seals made from the same type of elastomer may have a different hardness. Take your seal to someone who knows. They can measure the durometer and get you the proper seal.
Eric
-I appreciate you posting (thank you) but I'd already thought of this. That's the first place I would have gone if there was one in the area I trusted. Lots of people work counters, just not a great depth of knowledge most times when I ask technical questions around here. Many nice people live in this area, just not a lot of technical expertise on some subjects. I'll probably have to drive 75 miles to Knoxville for a valid opinion on hydraulic seals. If I still lived in Chicago I would have had the answer already. Life in rural Tennessee is an adjustment for some things.
