Silicon O-Rings

Silicones, despite containing carbon and hydrogen, are primarily constructed around a robust sequence of silicon and oxygen atoms, rather than featuring a long chain of carbon atoms as found in many hydrocarbons. This silicon-oxygen backbone is considerably stronger than a carbon-based one, rendering silicones highly resistant to extreme temperatures (-54 to +232°C), chemical exposure, and shearing stresses.

Due to the saturation in the polymer’s primary chain, silicones exhibit remarkable resistance to oxygen, ozone, and UV light. However, this saturation necessitates peroxide curing since sulfur curing is not feasible for a saturated polymer.

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Category: O-Rings

Description
Material Selection Guide

Description

ASTM D 1418 Designations: MQ, PMQ, VMQ, PVMQ
ASTM D 2000 / SAE J200 Type / Class: FC, FE, GE
STANDARD COLOR: Red

Trade names:
• KE® (Shin-Etsu Silicones)
• Silastic® (Dow Corning Corp.)
• Silplus® (Momentive Performance Materials Inc.)
• Tufel® (Momentive Performance Materials Inc.)

Relative cost: Medium
General temperature range: -54 to +232° c

Silicone performs well in:
• Engine & transmission oils (mineral oils)
• Ozone
• Dry heat

Silicone does not perform well in:
• Petroleum oils & fuels
• Ketones (MEK, acetone)
• Steam
• Concentrated acids

Material Selection Guide

MATERIAL	NR	SBR	NBR	CR	EPDM	HNBR	ACM	CSM	SILICONE	FKM (VITON)
HARDNESS RANGE (SHORE A)	40-90	35-90	40-90	40-80	40-90	40-90	40-80	40-80	30-80	50-90
HIGH TEMP ^oC	100	120	130	130	150	150	180	150	230	225
LOW TEMP ^oC	-50	-55	-45	-40	-50	-45	-25	-40	-60	-15
STEAM	F	F	F	P	G	G	P	E	E	E

E= EXCELLENT; G= GOOD; F= Fair; P= Poor; A=Available, NA= Not Available This guide is intended for general reference Only. The materials listed are the most commonly used. There are numerous compound variations designed for specific applications for which please forward details to our engineers for recommendation.