They have a huge on line catalog. They have a search tool so enter "gaskets" You can find all the materials with info on what each type is good for plus find out all the materials they sell by the linear ft. That should get you what you want. Even if you don't buy it there you can learn about all the materials.
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
Yours Aye! Rick ~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^ "It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"