O ring nbr has good heat resistance.O ring nbr has a temperature range of operation of-40°C to+125°C.It is resistant to mineral oil and has good wear resistance,stable heat resistance,and adjustable hardness.It is the most representative material used in O ring.O ring mainly rely on the sealing action generated by the cross-sectional deformation of the assembly state,and it can be used as various fluid media(such as lubricating oil,hydraulic oil,fuel oil,and water)in suitable chambers.