O Ring Materials

Because of the range of materials available determining which o ring is appropriate for use in a specific application is a process whose importance cannot be overstated.
O ring materials. O ring material family chemical compatibility temperature resistance and other properties all factor in to o ring material selection for an application. Some of the common types of o ring materials include ptfe nitrile buna neoprene epdm rubber and fluorocarbon viton. Typical part number for a metric o ring id x cs material shore hardness 2x1n70 defines this o ring as 2mm id with 1mm cross section made from nitrile rubber which is 70sh. Metric o rings are usually defined by the internal dimension x the cross section.
O ring materials and types. Fkm also known as viton a registered trademark name of the chemours company is fluorocarbon a brand of synthetic rubber and fluoropolymer elastomer. Safety datasheets are available here. This popular o ring material family comparison shows basic rubber material family properties and performance plastic properties.
Silicone and kalrez o ring materials are also widely used especially in high temperature applications. Bs o rings are defined by a standard reference. Below is a summary of the different commonly used o ring materials and types. Each material page has a table with the available datasheets in pdf.
The information below along with consultation with the resources.