I have four tiny but very expensive O-rings used for dust scraping around pistons in motorcycle brake calipers. Thay have expanded due to an oil leakage and I hope that it's possible to shrink them again somehow.
I know very little of polymers, but the O-rings are brake fluid resistant and apparently not transmission oil resistant. Looking at this list:
The rings could be made of EPDM (Ethylene Propylene) but that is just an unqualified guess.
The rings feel like they haven't changed properties beside the expansion which makes me hope that it is possible to shrink them again. What do you, dear readers, think of this?
Thanks in advance.