Acrylonitrile / Butadiene (NBR)

NBR, Buna-N, and nitrile all represent the same elastomer based on a butadiene and acrylonitrile copolymer. Nitrile is inherently resistant to hydraulic fluids, lubricating oils, transmission fluids and other non-polar petroleum based products due to the polar structure of this elastomer. Nitriles are also resistant to air and water environments.

Utilizing the variety of nitrile polymers and compounding ingredients, Minnesota Rubber and Plastics has derived nitrile compounds to withstand environments that require low compression set, abrasion resistance, low temperature flex, gas permeation resistance, ozone resistance and/or stress-stain properties.

By hydrogenation, carboxylic acid addition, or PVC blending, the nitrile polymer can meet a broader range of physical or chemical requirements.

Compound 366Y

• Excellent petroleum fluid and water resistance
• Outstanding oil resistance to aniline point oils of 130° F to 255° F (55° C to 124° C)
• Good compression set resistance

Compound 372FX

• Good oil and water resistance
• Good compression set resistance
• Low durometer and modulus
• Low temperature resistance

Compound 431 T

• Low swell to petroleum oils and fuels
• Outstanding oil resistance - aniline point oils below 130°F (55°C)
• Low temperature properties to -30°F (-34°C)
• High tensile strength and good abrasion resistance
• Good heat aging

Compound 523HW

• Excellent low temperature performance at -70°F (-57°C)

Compound 525K

• Excellent abrasion and wear resistance
• Good heat resistance and compression set resistance
• Frequently used for ground ball applications
• Excellent contact compatibility properties with plastics

		Tensile		Elongation	Oil Aging  Volume Swell (Change %)  70hr at 100°C/212°F
Compound	Hardness  Shore A	MPa	psi	(%)	ASTM #1	IRM 903
366Y	70	14.1	2050	320	-4	+10
525K	70	17.2	2500	330	-1	+16
431T	70	14.6	2100	340	-13	-5
523HW	70	13.8	2000	330	-9	+19
372FX	50	10.0	1450	400	-10	+20