On Mon, 20 Oct 2008 20:26:55 -0400, "Mortimer Schnerd, RN"
mschnerdatcarolina.rr.com wrote:



"MLD" wrote in message ...
Any suggestions for lubricating O-Rings that are used for water pumps,
basically I want to extend useful life as much as possible. Someone
suggested lithium grease?

Petroleum Jelly (Vaseline)

I don't think so---will eventually ruin the O ring



Back in the day when I was learning how to rebuild scuba regulators and valves I
was warned NEVER to use petroleum jelly or oil on a rubber o-ring as the
petroleum products would eventually attack and destroy rubber. We used silicon
grease.

EPDM rubber is not compatible with Vaseline. Is this what scuba gear
uses? It may be because respirators use it. This is the same type of
rubber that automotive door seals are made of.

EPDM is not used as O-ring material in pumps.