Pressure Seal 3918 Nitrile

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Pressure Seal 3918 Nitrile - Butadiene
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Compound 3918 is a 90 durometer black colored Buna N elastomer, it is formulated with Teflon to provide internal lubrication. All materials in this compound are FDA approved. This compound will meet or exceed the specifications listed and has the following physical properties: ASTM D2000 6 BG 915 A14 B14 B343 EO14 EO34; 7 BG 915 B14 EA14 EF11 EF21 EO14 EO34; 4 BK 915 A14 B14 EF11 EO14 Information provided by Pressure Seals Inc.
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Physical Properties	Original Value	Comments

Specific Gravity	1.31 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Shore A	94
	85 @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	92 @Temperature 100 °C, Time 252000 sec	Distilled water aged
	92 @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
	93 @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	94 @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	94 @Temperature 100 °C, Time 252000 sec	Heat Aged
	96 @Temperature 125 °C, Time 252000 sec	Heat Aged
	96 @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
Tensile Strength	3408 psi
	2443.5 psi @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	2784.3 psi @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	2842.3 psi @Temperature 125 °C, Time 252000 sec	Heat Aged
	2842.3 psi @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
	3295.5 psi @Temperature 100 °C, Time 252000 sec	Heat Aged
	3496.6 psi @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	3523.9 psi @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
Elongation, Ultimate	126 %
	57.96 % @Temperature 125 °C, Time 252000 sec	Heat Aged
	57.96 % @Temperature 125 °C, Time 252000 sec	Heat Aged, Test Tube Method
	93.6 % @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel A
	97.02 % @Temperature 100 °C, Time 252000 sec	Heat Aged
	102.1 % @Temperature 23.0 °C, Time 252000 sec	ASTM Reference Fuel B
	114.03 % @Temperature 100 °C, Time 252000 sec	ASTM Oil #1
	121.97 % @Temperature 100 °C, Time 252000 sec	ASTM Oil #3
100% Modulus	126 psi
Tear Strength	263 pli	Die C
	413 pli	Die B
Compression Set	9.2 % @Temperature 100 °C, Time 79200 sec	Solid
	12.4 % @Temperature 125 °C, Time 79200 sec	Solid
	13.9 % @Temperature 100 °C, Time 252000 sec	Solid
	19.9 % @Temperature 100 °C, Time 79200 sec	Plied
	27 % @Temperature 125 °C, Time 79200 sec	Plied
	27.4 % @Temperature 100 °C, Time 252000 sec	Plied

Thermal Properties	Original Value	Comments
Brittleness Temperature	4.00 °F
Shrinkage	-0.400 % @Temperature 100 °C, Time 252000 sec	Volume, ASTM Oil #1
	1.1 % @Temperature 23.0 °C, Time 252000 sec	Volume, ASTM Reference Fuel A
	4.6 % @Temperature 100 °C, Time 252000 sec	Volume, Distilled water aged
	5.9 % @Temperature 100 °C, Time 252000 sec	Volume, ASTM Oil #3
	27.5 % @Temperature 23.0 °C, Time 252000 sec	Volume, ASTM Reference Fuel B

Descriptive Properties
Color	Black

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PPRESL033 / 318243

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