Precision Polymer Engineering S50N Silicone Rubber

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Precision Polymer Engineering S50N Silicone Rubber
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE); Silicone
Material Notes:	Silicone Rubber, 45-55 °IRHD. Silicone rubber having both methyl and vinyl substituent groups on the polymer chain. ASTM & ISO designation = VMQ. To meet UK Ministry of Defence Aircraft Materials Specification DTD5582A Grade 50. Applications: Particularly suitable in fluid sealing applications where low compression set is of prime importance in O-rings and gaskets. Can be used in contact with heavy mineral and certain diester-based oils within the quoted temperature range. Unsuitable for use in contact with petroleum based fuels, light mineral oils or greases derived from them. Excellent ozone resistance.
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Mechanical Properties	Metric	English	Comments

Hardness, Shore A	50	50	°IRHD; ASTM D1415
	47 - 55	47 - 55	°IRHD, -3/+5 change after 336 hours @ 200°C; ASTM D1415
Tensile Strength, Yield	3.84 MPa	557 psi	-20% change after 336 hours @ 200°C; ASTM D412
	4.80 MPa	696 psi	ASTM D412
Elongation at Break	140 %	140 %	-30% change after 336 hours @ 200°C; ASTM D412
	200 %	200 %	ASTM D412
Compression Set	15 % @Temperature 150 °C, Time 86400 sec	15 % @Temperature 302 °F, Time 24.0 hour	ASTM D395

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	250 °C	482 °F
Minimum Service Temperature, Air	-65.0 °C	-85.0 °F
	-65.0 °C	-85.0 °F	Non-brittle after 3 minutes
Flash Point	>= 300 °C	>= 572 °F

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