Nitrile vs Silicone O Rings: How to choose

Nitrile butadiene rubber, also known as NBR, is a synthetic rubber copolymer that offers superior resistance to oils, acids and other chemicals. The material’s most high-profile use is the gloves used by doctors, nurses, lab techs and cleaners. It also resists punctures well.

We supply a wide range of nitrile O rings, including those suitable for use with food and potable water, with a shore hardness rating of 40 – 90. We can provide nitrile O rings that have been treated with a talc finish or specially formulated to work at temperatures down to -40 in different colours.

Silicone, not to be confused with the chemical element silicon, is a remarkably versatile and flexible material. We see it everywhere from the latest home baking trays to baby bottle nipples. Because of its excellent heat resistance, silicone is used widely in the aerospace and automotive industries. Silicone O rings protect airplane equipment from the extreme temperatures encountered at altitude.

Our silicone O rings feature a shore hardness rating of 30 – 90 and a working low temperature down to -50. We offer silicone O rings that can be used with potable water and in food processing in a variety of colours.

With so much overlap, it is not always easy to decide between nitrile vs silicone O rings. Applications with significant chemical exposure generally call for nitrile O rings, which those with extreme temperatures tend to require silicone. But given the potential damage from using the wrong kind of O ring, it is best not to guess. We’re always happy to review your needs and help you decide on nitrile vs silicone O rings for your equipment.