Low Conductivity Water (LCW) Seals

[PeterIgg]

Hi

Anyone had experience in working with this fluid that they would care to share, specifically seal materials? I am aware of viton and EPDM being acceptable and Graphite and Ptfe definitely NOT. Any others? UHMWPE perhaps? Acetal (Delrin)?

Any pitfalls that we should be aware of?

Cheers.

 

[btrueblood]

UHMW and Acetal are okay, but don't exceed their upper temperature limits. UHMW just gets soft and creeps/relaxes under load. Acetal actually breaks down (crumbles) due to hydrolysis attack by water above about 140F.

- Ben T.