Freudenberg N470 Nitrile Elastomer (NBR)

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Freudenberg N470 Nitrile Elastomer (NBR)
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®
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Physical Properties	Original Value	Comments

Specific Gravity	1.24 g/cc	ASTM D297

Mechanical Properties	Original Value	Comments
Hardness, Shore A	75	Original Property; ASTM D2240
	67	ASTM Reference Fuel B Immersion, 168 hours; ASTM D2240
	71	ASTM IRM-903 Oil Immersion, 70 hours; ASTM D2240
	77	Air Aging, 70 hours; ASTM D2240
Tensile Strength, Ultimate	17.8 MPa	Original Property; ASTM D1414
	1320 psi	ASTM Reference Fuel B Immersion, 168 hours; ASTM D1414
	2614 psi	Air Aging, 70 hours; ASTM D1414
Elongation at Break	377 %	Original Property; ASTM D1414
	267.67 %	ASTM Reference Fuel B Immersion, 168 hours; ASTM D1414
	324.22 %	Air Aging, 70 hours; ASTM D1414
Compression Set	64 % @Temperature 125 °C, Time 252000 sec	ASTM D395 Method B

Descriptive Properties
Bend (flat)	Pass	AMS 7270K
Bend Oval	PASS	Low Temp. Brittleness, Fuel B, 48 hours at 23°C, then Fuel A, 48 hours at 23°C, then Fuel A 5 hours at -40°C per AMS-7270K paragraph 4.5.2
Volume Change (%), ASTM D471	-1.4	Low Temp. Brittleness, Fuel B, 48 hours at 23°C, then Fuel A, 48 hours at 23°C, then Fuel A 5 hours at -40°C per AMS-7270K paragraph 4.5.2
	15	ASTM IRM-903 Oil Immersion, 70 hours
	34	ASTM Reference Fuel B Immersion, 168 hours

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PSIMR141 / 79103

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