... offers metallic O-rings (hollow or solid rings)and Rubber O-rings, which are widely used. O ... Rings:They seal over a wide range of pressure, temperature and tolerance, Ease of service, no smearing or ... , an advantage over non-elastic flat seals and crushes type gaskets, The duration of life ... are available in EPDM, Neoprene, Silicon, NBR and FKM, PTFE and also metallic material like SS304, SS316, SS321 ...