Conceived to obtain an excellent level of sealing whatever the pressure level or temperature, the O rings are used in all the fields of industry, in static and dynamic application. It is the integration of a ring with circular section (torus) in a throat dimensioned according to the diameter of the joint which ensures the perfect sealing of the product.

O rings PTFE require a weak tightening torque and adapt to a large range of operating conditions:
- resistance to temperatures of - 200 to + 260 °C
- adaptation to all the aggressive chemical fluids, with cryogenics, the vacuum and the gas
- diameters available from 1 to 12 mm according to the standards
- various materials of composition: rubber, materials plastic or various metals.

Available out of PTFE, silicone, Viton®, EPDM, nitrile, fluorocarbon, chloroprene, perflouélastomère, the Group Eynard Robin also proposes a broad range of O rings metal or covered out of alloy nickel, stainless steel or hastelloy (EYTOR and EYCAP).