Seals Eastern 7204 Ethylene-Propylene Rubber

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Seals Eastern 7204 Ethylene-Propylene Rubber
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Y267-Type EPDM for geothermal steam service. Ultra-Low compression set. Information provided by Seals Eastern, Inc.
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Physical Properties	Metric	English	Comments

Specific Gravity	1.121 g/cc	1.121 g/cc	ASTM D297, 15

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	>= 85	>= 85	ASTM D2240, Type A
	92	92	AVG; ASTM D2240, Type A
Tensile Strength at Break	>= 13.1 MPa	>= 1900 psi	ASTM D412 Method A
	15.29 MPa	2218 psi	AVG; ASTM D412 Method A
Tensile Stress at Strain	8.322 MPa @Strain 25 %	1207 psi @Strain 25 %	ASTM D412 Method A
	11.85 MPa @Strain 50 %	1719 psi @Strain 50 %	ASTM D412 Method A
	13.80 MPa @Strain 100 %	2001 psi @Strain 100 %	ASTM D412 Method A
Elongation at Break	>= 80 %	>= 80 %	ASTM D412 Method A
	85 %	85 %	AVG; ASTM D412 Method A
Modulus of Elasticity	0.02974 GPa	4.314 ksi	ASTM D412 Method A
Poissons Ratio	0.50	0.50	Calculated
Shear Modulus	0.009915 GPa	1.438 ksi	ASTM D412 Method A
Secant Modulus	0.02797 GPa	4.056 ksi	ASTM D412 Method A
Tear Strength Test	146	146	(psi); ASTM D624, Die B
Compression Set	13 % @Temperature 125 °C, Time 252000 sec	13 % @Temperature 257 °F, Time 70.0 hour	ASTM D395, Test B

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	191 °C	375 °F	ASTM D1329
Glass Transition Temp, Tg	-51.1 °C	-60.0 °F	ASTM D1329

Descriptive Properties
Strain Energy / Unit Volume at 20% Elongation (psi)	119

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