Nitrile elastomers are copolymers of acrylonitrile and butadiene. Silicone and kalrez o ring materials are also widely used especially in high temperature applications.
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Nbr o ring material. There are a number of common variations of nitrile compounds. Buna n o rings also referred to as nbr o rings and nitrile o rings are the most widely used o ring material in the word because of low cost good mechanical performance with resistance to water most basic oils lubricants and some fuels many pneumatic hydraulic systems and the default choice for basic applications. As the nbr content increases resistance to petroleum base oils and hydrocarbon fuels increases but low temperature flexibility decreases. O ring material family chemical compatibility temperature resistance and other properties all factor in to o ring material selection for an application. Nitrile rubber nbr o rings also known as buna n are one of the most commonly used sealing elastomers due to resistance to petroleum based fuels and lubricants and its relatively low price. Kootans nitrile rubber o ring kit o rings assortment kit set 24sizes 1200pcs oil resistant nbr metric o ring sealing assortment kit for air plumbing fuel jnjector and faucet seal o rings 42 out of 5 stars 39.
The nitrile o ring is commonly referred to as a buna o ring or nbr o rings. For general purpose applications such as pneumatics hydraulics and fuel systems nitrile o rings provide cost effective sealing performance especially when hydrogenated versions or specialty material compounds are used. The term buna n is really not much more specific than the term steel. Effective from 40c to 120c. Nitrile provides excellent compression set tear and abrasion resistance. This popular o ring material family comparison shows basic rubber material family properties and performance plastic properties.
The guide includes generalized recommended o ring mateiral uses and non recommended uses with typical material mechanical properties. Acrylonitrile content varies in commercial products from 18 to 50. Nbr nitrile chemically is a copolymer of butadiene and acrylonitrile. Buna n o rings buna n o rings. Nitrile o rings also known as buna n o rings or nbr o rings are one of the most common types of o ring materials because of their low cost performance in basic water oils fuels and lubricants. For the purposes of this article we will focus on just three common rubber types found in o rings and similar automotive seals.
Some of the common types of o ring materials include ptfe nitrile buna neoprene epdm rubber and fluorocarbon viton. Note that each type is actually a family of rubber compounds. We offer o ring materials in custom and industry standard sizes. This material has a desirable set of properties including low compression set high resistance to abrasion and good tensile strength. Buna n viton and epdm. Datwyler offers a complete selection of both the standard as568 o ring and metric o ring sizes.
O ring material quick reference guide rubber sealing materials. Also called nbr or buna n nitrile o rings are probably the most economical and widely used elastomer out there.
Gallery of Nbr O Ring Material
