Which O-Rings are currently available?, The expert answershttps://www.racmet.com/en-ww/which-o-rings-are-currently-available.aspxThe O-Rings currently available are: EPDM (ethylene-propylene diene polymer) O-Rings usually assembled on pressfitting joints; NBR (nitrile rubber) O-Rings; FKM (fluorocarbon rubber) O-Rings; MVQ (silicone rubber) O-Rings; For uses different from traditional uses (water, EPDM, gas NBR, solar FKM), always enquire about compatibility by contacting our Technical Department.