Pressure Seal 3720 Nitrile

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Pressure Seal 3720 Nitrile - Butadiene
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Compound 3720 is a 70 durometer black colored Buna N elastomer, it is specifically formulated for resistance to hot petroleum based oils and dry heat. It exhibits very good resistance to compression set and hot water, and is recommended for low temperature service where fuel resistance is required. This compound is peroxide cured. This compound will meet or exceed the specifications listed and has the following physical properties: ASTM D2000 2 BF 720 B14 B34 EO14 EO34; 2 BG 720 B14 B34 EO14 EO34 EF11 EF21 EA14 F17; 3 BG 720 B14 EO14; 4 BG 720 A14 B14 EO14; 5 BG 720 A14 B14 B34 EO14 EO34; 2 CH 720 A25 B14 B34 EO15 F17; 3 CH 720 A25 B14 B34 EO16; 5 CH 720 A25 B14 B34 F14; 6 CH 720 A25 B14 B34 F17 SAE J 120 R1 C1.I AMS 7270 Information provided by Pressure Seals Inc.
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Physical Properties	Original Value	Comments

Specific Gravity	1.19 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Shore A	74
	63 @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel C
	64 @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	67 @Temperature 125 °C, Time 252000 sec	ASTM Oil #3
	69 @Temperature 150 °C, Time 252000 sec	ASTM Oil #3
	70 @Temperature 100 °C, Time 252000 sec	Distilled water aged
	71 @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
	72 @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	74 @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	74 @Temperature 125 °C, Time 252000 sec	ASTM Oil #1
	74 @Temperature 150 °C, Time 252000 sec	ASTM Oil #1
	76 @Temperature 100 °C, Time 252000 sec	Heat Aged
	80 @Temperature 125 °C, Time 252000 sec	Heat Aged
	80 @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
Tensile Strength	2319 psi
	1103.8 psi @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel C
	1416.9 psi @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	1797.2 psi @Temperature 150 °C, Time 252000 sec	ASTM Oil #3
	1834.3 psi @Temperature 125 °C, Time 252000 sec	ASTM Oil #3
	1878.39 psi @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	2256.4 psi @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
	2411.76 psi @Temperature 100 °C, Time 252000 sec	Heat Aged
	2437.3 psi @Temperature 125 °C, Time 252000 sec	ASTM Oil #1
	2441.9 psi @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	2543.9 psi @Temperature 125 °C, Time 252000 sec	Heat Aged
	2543.9 psi @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
	2710.9 psi @Temperature 150 °C, Time 252000 sec	ASTM Oil #1
Elongation, Ultimate	277 %
	137.9 % @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel C
	157.89 % @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	168.97 % @Temperature 150 °C, Time 252000 sec	ASTM Oil #3
	203.3 % @Temperature 150 °C, Time 252000 sec	ASTM Oil #1
	209.1 % @Temperature 125 °C, Time 252000 sec	ASTM Oil #3
	214.952 % @Temperature 125 °C, Time 252000 sec	Heat Aged
	214.952 % @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
	232.1 % @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
	232.13 % @Temperature 100 °C, Time 252000 sec	Heat Aged
	232.96 % @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	252.07 % @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	270.9 % @Temperature 125 °C, Time 252000 sec	ASTM Oil #1
100% Modulus	712 psi
Tear Strength	151 pli	Die C
	160 pli	Die B
Compression Set	4.7 % @Temperature 100 °C, Time 79200 sec	Solid
	8.6 % @Temperature 100 °C, Time 252000 sec	Solid
	9.0 % @Temperature 125 °C, Time 79200 sec	Solid
	9.3 % @Temperature 100 °C, Time 79200 sec	Plied
	13.8 % @Temperature 125 °C, Time 252000 sec	Solid

Thermal Properties	Original Value	Comments
Brittleness Temperature	-50.0 °F
Shrinkage	-2.90 % @Temperature 100 °C, Time 252000 sec	Volume, ASTM Oil #1
	-2.80 % @Temperature 150 °C, Time 252000 sec	Volume, ASTM Oil #1
	-2.20 % @Temperature 125 °C, Time 252000 sec	Volume, ASTM Oil #1
	1.9 % @Temperature 100 °C, Time 252000 sec	Volume, Distilled water aged
	2.8 % @Temperature 23.0 °C, Time 252000 sec	Volume, ASTM Reference Fuel A
	12 % @Temperature 100 °C, Time 252000 sec	Volume, ASTM Oil #3
	14.7 % @Temperature 150 °C, Time 252000 sec	Volume, ASTM Oil #3
	15 % @Temperature 125 °C, Time 252000 sec	Volume, ASTM Oil #3
	36.1 % @Temperature 23.0 °C, Time 252000 sec	Volume, ASTM Reference Fuel B
	63.7 % @Temperature 23.0 °C, Time 252000 sec	Volume, ASTM Reference Fuel C

Descriptive Properties
Color	Black

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