IS THERE A DIFFERENCE BETWEEN GREEN AND BLACK O-RINGS?

Black O-rings are commonly made from materials like nitrile rubber (NBR) or fluoroelastomers (FKM). Black o rings were primarily the only coloured o rings around prior to 1987; however, as new materials come onto the market, different colours were required to identify the different materials in use, marking out their visibility and allowing businesses to check their suitability for specific and different applications.  Black O-rings are commonly used in a wide range of industrial applications, including automotive, machinery, hydraulics, and pneumatics. They are suitable for sealing applications that involve contact with oils, fuels, hydraulic fluids, and moderate chemical exposure.

Green o rings are hydrogenated Nitrile, also known as highly saturated Nitrile, or more commonly known as HNBR. These o rings have the green colour moulded into their rubber and were introduced with the refrigerant of 134a, suitable for high temperatures and fluctuating stress loads. 

Colored oil seals

SBT provides a range of o rings and can help with colour coding for inventory management.  Our knowledgeable, experienced, and friendly team is on hand to help find the most suitable o ring material for your application.