NBR Shore A 20-95 / Products

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NBR Shore A 20-95

Basic Property
Economy of Material	1
Compression Set Resistance	1
Resilience (Rebound)	2
Tear Strength	2
Heat Aging Resistance	3
Ozone Resistance	4
Resistance to Oil & Grease	2
Fuel Resistance	4
Water Swell Resistance	2
Gas Impermeability	2
Dynamic Service / Abrasion Res.	2
High Temperature - Standard	212
High Temperature - Special	250
Low Temperature - Standard	-22
Low Temperature - Special	-60

Very Good = 1

Good = 2

Average = 3

Poor = 4

Temperature in °F

NITRILE (NBR)
Nitrile is the most widely used elastomer in the seal industry. The popularity of nitrile is due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of -22°F to 212°F. Nitrile is a copolymer of butadiene and acrylonitrile. Variation in proportions of these polymers is possible to accommodate specific requirements. An increase in acrylonitrile content increases resistance to heat plus petroleum base oils and fuels but decreases low temperature flexibility. Military AN and MS O ring specifications require nitrile compounds with low acrylonitrile content to insure low temperature performance. Nitrile provides excellent compression set, tear, and abrasion resistance. The major limiting properties of nitrile are its poor ozone and weather resistance and moderate heat resistance, but in many application these are not limiting factors.	Temperature Range (dry heat)
	low	high
	-22 °F -30 °C	212 °F 100 °C
	Application Advantages
	» excellent compression set, » superior tear resistance » abrasion resistance
	Application Disadvantages
	» poor weather resistance » moderate heat resistance
	Modifications
	» acrylonitrile content (ACN) from 18% to 50% » peroxide vs. sulfur donor cure system » XNBR improved wear resistance formulation
Primary Uses	Specialized Applications
O-rings, rubber seals and custom molded rubber components for: » Oil resistant applications » Low temperature applications » Fuel systems, automotive, marine, and aircraft » General Industrial Use	» NBR NSF standard 61 for potable water applications » NBR WRc, KTW water applications » NBR FDA white list compounds