Temperature is critical.

Chemical compatibility of common elastomers

Durometer is one of several measures of hardness of objects like rubber and plastic.

COMMON SEAL FAILURES

Oil seals – often called grease, fluid or dirt seals – very simply need to stop the fluid that is inside from leaking out.

A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates…

When high temperature conditions require high tensile strength and resistance, one elastomer comes to mind:Hydrogenated Nitrile Butadiene Rubber (HNBR).

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We mostly think of back up rings as being used with O-Rings. But they also are used with T-seals (an O-Ring substitute) as well as various styles of piston seals and occasionally with U-Seals.

Compression packing which is also called braided packing or rope packing.

Most fluid systems have fasteners that must be sealed. Face Seals feature an elastomeric sealing element molded in place within a metal retainer (washer).

Thread seals have been designed to seal the threads of machine screws, studs, and similar items.