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By certification 
Product name: fuel resistant o rings
Size: Standard and non standard
Color: Common is black, can be produced as you need
Hardness: 40-90 Shore
What type of O rings are fuel resistant o rings?
The most common use material for fuel resistant is NBR, also known as Buna and Nitrile, and FKM. According to the actual specific working conditions, also can choose HNBR, Fluorosilicone, ACM, ACR, etc.
http://www.sjkseal.com/
