301 – Silicone Rubber (VMQ)

ASTM D-2000 classification: FC, FE, GE


Temperature Range:

- 65°C to + 232°C (-85°F to +450°F)



Silicone Rubber is made from silicone, oxygen, hydrogen, and carbon; it can be compounded to be electrically resistant, conductive, or flame retardant.

Its unique characteristics include an ability to cope with high extremes of temperature in excess of 240°C it also remains flexible at temperatures as low as -65°C. Whilst in general silicones can exhibit poor tensile strength, tear resistance, and abrasion resistance there are specialist compounds that have been developed which can increase certain properties for more specialised applications, high strength compounds have been made, but their strength still does not compare to natural rubbers.

When cured correctly Silicone compounds are very clean and can be used in many food and medical applications because they do not impart odour or taste. Due to the relatively low tear strength and high coefficient of friction Silicone compounds are not recommended for dynamic O-ring sealing applications. Silicone has low resistance to mineral oils but has excellent resistant to hot air, ozone, UV radiation, engine and transmission oils, animal and vegetable fats and oils, and brake fluids.



Standard Stock Sheet colours: - Translucent, White, Black, Blue, Red Oxide, Grey

An infinite range of colours, including ‘Colour Matched’, are available for bespoke made items.


EMI ReferenceSpecificationHardness IRHD SGTensile Strength (psi)Elongation at Break %Colour
301 - S301Commercial30°1.121090450To Order
301 - S401Commercial40°1.121100450To Order
301 - S406Food Quality40°1.121100450To Order
301 - S407Oil Resistant40°1.121100343To Order
301 - S501Commercial50°1.121700560To Order
301 - S506Food Quality50°1.121700560To Order
301 - S508High Strength50°1.151450600To Order
301 - S601Commercial60°1.161500400To Order
301 - S606Food Quality60°1.161500400To Order
301 - S607Oil Resistant60°1.161450560To Order
301 - S609High Temp60°1.171230350To Order
301 - S701Commercial70°1.191690360To Order
301 - S706Food Quality70°1.191690360To Order
301 - S707Oil Resistant70°1.191650380To Order
301 - S708High Strength70°1.221370475To Order
301 - S801Commercial80°1.211480320To Order
301 - S807Oil Resistant80°1.211565350To Order

Full data sheets for all grades are available on request.

* The information above is supplied in good faith and believed to be correct. This information is supplied upon the condition that persons receiving this will make their own determination as to its suitability for their purposes prior to use. EMI makes no representations or warranties, either expressed or implied with respect to the information or the product to which this information refers.