O-Rings

Great Western Seal and Gasket offers all 369 AS568 standard size O-Rings and a wide array of metric and non-standard size O-rings.  We create custom O-ring kits to meet our customer's specific requirements.

Buna-N (NBR) O-Rings

Acrylonitrile-Butadiene O-Rings, more often referred to as Buna, Nitrile or NBR, are the most common type of O-Rings .  These are available in a wide variety of sizes including all 369 AS568 standard inch sizes, the most popular standard in the United States, and ISO 3601 standard metric sizes.  Buna O-rings are available in 70 or 90 durometer hardness and black in color.

Viton® (FKM) O-Rings

Fluorocarbon (FKM) O-Rings, more often referred to as Viton°, a registered trademark of the Chemours Company, are known for their high chemical resistance. These are available in a wide variety of sizes including all 369 AS568 standard inch sizes, the most popular standard in the United States, and ISO 3601 standard metric sizes.  Viton° (FKM) O-rings are available in 75 or 90 durometer hardness and black or brown in color.

Silicone (VMQ) O-Rings

Vinyl-methyl-silicone O-Rings are available in a wide variety of sizes including all 369 AS568 standard inch sizes and ISO standard metric sizes. Silicone O-Rings are available in 70 durometer hardness and orange in color.

Teflon® (PTFE) Polytetrafluoroethylene O-Rings

Polytetrafluoroethylene (PTFE) O-Rings, more often referred to as Teflon° a registered trademark and a brand name owned by the Chemours Company, are a high-performance fluoropolymerare O-Ring. These are available in a wide variety of sizes including all 369 AS568 standard inch sizes, and a variety of metric sizes.  Teflon° (PTFE) O-rings are available in white.