One of the popular choices for seals for the intense, high pressure, corrosive, high temperature environments found in the oil and gas industry is a combination of a PTFE spring-energized seal with a PEEK back-up ring (BUR) installed on the downstream side of the seal gland. Why?
Need more information? Check out these PEEK resources and articles rom the Advanced EMC Technologies:
Cryogenic seals must not only handle unbelievable low temperatures, but also perform under high
pressure conditions. If you aren’t familiar with cryogenic seals, a cryogenic seal is a special type polymer seal used with media at temperatures below -238°F and down to -460°F (absolute zero). Cryogenic seals can be found in a variety of industries, from LNG compressors and loading arms in the petroleum industry to rocket propulsion systems in the aerospace industry.
Other important articles on Cryogenic Seals from Advanced EMC Technologies: