NBR (Nitrile, Buna-N)
Selection Guide
Nitrile is the term used to describe a copolymer of acrylonitrile and butadiene. The amount of acrylonitrile used in the copolymer varies between compounds and has a profound effect on the mechanical and physical properties of the material, O-rings, gaskets, & custom molded parts. Generally, Nitrile O-rings, gaskets, & custom molded parts are very oil-resistant, have strong mechanical properties, are resistant to wear, and are relatively inexpensive. These properties make Nitrile the most commonly used general purpose O-ring, gasket, & custom molded part material. TKF Tech carries a huge variety of Nitrile based seals, O-rings, gaskets, & custom molded parts and supplies thousands of customers in a diverse range of industries.
Specific physical and chemical resistances vary by compound formulation. Basic NBR O-rings, gaskets, & custom molded parts are not resistant to weathering or ozone without special formulation. Hydrogenated versions of NBR (HNBR) O-rings, gaskets, & custom molded parts are more resistant to temperature, chemicals, and ozone.
Common names include: NBR (acrylonitrile butadiene rubber), Buna-N, Nitrile Trade Names: CHEMIGUM®, HYCAR®, PARACRIL® , PERBUNAN®, KRYNAC®, NYSYSN®
Features of NBR
-
NBR O-rings, gaskets, & custom molded parts have a relative low cost
-
NBR O-rings, gaskets, & custom molded parts have good resistance to compression set and tear/abrasion
-
NBR O-rings, gaskets, & custom molded parts have good resistance to many petroleum oils/greases, hydraulic fluids, alcohol, ambient water, silicone greases, mineral oil and grease
-
NBR O-rings, gaskets, & custom molded parts have good resistance to many fuels and aliphatic hydrocarbons (propane, butane, diesel fuel, fuel oils) as well as ethylene-glycol based fluids
-
NBR O-rings, gaskets, & custom molded parts are compatible with HFA, HFB and HFC fluids
-
NBR O-rings, gaskets, & custom molded parts are available in multiple compounds to meet performance and cost requirements
Limitations of NBR
-
NBR O-rings, gaskets, & custom molded parts are not compatible with ozone, direct sunlight, UV, or weathering
-
NBR O-rings, gaskets, & custom molded parts have poor resistance to aromatic fuels, glycol-based brake fluids, polar solvents, non-flammable hydraulic fluids (HFD), aromatic/chlorinated hydrocarbons, and strong acids
-
NBR O-rings, gaskets, & custom molded parts have a 15 year shelf life
-
NBR O-rings, gaskets, & custom molded parts have a Service temperature range of (varies with application) Typically -20°F to 200°F (-30°C to 100°C) *Special formulations allow range of -65°F to 275°F (-54°C to 135°C)
Please consult a TKF Tech Engineer about your specific application and we will use our decades of experience to formulate a solution that fits your need.
TKF Tech is a proud partner of Canyon Components, LLC and can provide Canyon Components materials, O-rings, and custom parts. Click here to see what Canyon has to offer.