Fnord wrote:as well as the limit of my collar-bone's impact strength.
UHMWPE does stretch enough. When I was making my check-valved piston, I put the piston into a vise to tap for the valve housing, but when I screwed in the bolt, I found it had increased significantly in diameter and had to be put back into the drill press and made smaller.
Do we have any numbers on heat resistance? The source of all data on plastics has data on UHMWPE, but I can't find anything substantial on nitrile rubber.