Freudenberg N431 Nitrile Elastomer (NBR)

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Freudenberg N431 Nitrile Elastomer (NBR) (discontinued **)
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	General Purpose; Internal Lubricant. Inferior resistance to ozone, sunlight and natural aging; poor resistance to oxygenated solvents. All testing done on AS568-214 size o-rings This product was formerly sold under the Freudenberg Simrit division; now Freudenberg Sealing Technologies.
Key Words:	CHEMIGUM® , HYCAR® , PARACRIL® , PERBUNAN®, KRYNAC®, NYSYSN®
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Mechanical Properties	Original Value	Comments

Hardness, Shore A	60	Original Properties; ASTM D2240
	50	ASTM Reference Fuel B Immersion, 70 hours; ASTM D2240
	61	ASTM Fuel A Immersion, 70 hours; ASTM D2240
	63	Air Aging, 70 hours; ASTM D2240
	63	ASTM IRM-903 Oil Immersion, 70 hours; ASTM D2240
	64	Water Resistance, 70 hours; ASTM D2240
Tensile Strength, Ultimate	12.9 MPa	Original Properties; ASTM D412 Die C
	7.4304 MPa	ASTM Reference Fuel B Immersion, 70 hours; ASTM D412 Die C
	13.18 MPa	ASTM Fuel A Immersion, 70 hours; ASTM D412 Die C
	13.66 MPa	Air Aging, 70 hours; ASTM D412 Die C
	15.82 MPa	ASTM IRM-903 Oil Immersion, 70 hours; ASTM D412 Die C
Elongation at Break	486 %	Original Properties; ASTM D412 Die C
	292 %	ASTM Reference Fuel B Immersion, 70 hours; ASTM D412 Die C
	379.08 %	Air Aging, 70 hours; ASTM D412 Die C
	448 %	ASTM IRM-903 Oil Immersion, 70 hours; ASTM D412 Die C
	476.28 %	ASTM Fuel A Immersion, 70 hours; ASTM D412 Die C
Compression Set	13 % @Temperature 100 °C, Time 79200 sec	ASTM D395

Descriptive Properties
Volume Change (%), ASTM D471	-1.1	ASTM IRM-903 Oil Immersion, 70 hours at 100°C
	-1.2	ASTM Fuel A Immersion, 70 hours at 23°C
	17.1	ASTM Reference Fuel B Immersion, 70 hours at 23°C
	-4.8	Water Resistance, 70 hours at 100°C

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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PSIMR140 / 79102

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