SILICONE RUBBER
DESCRIPTION AND PRODUCT CHARACTERISTICS :
AFTER VULCANISATION THE GENERAL APPEARANCE OF EXPANDED SILICONE IS A FINE NON-INTERCONNECTING CELL STRUCTURE ENCAPSULATED BY A SOFT SMOOTH OUTER SKIN. DENSITY OF STRUCTURE IS VARIED TO SUIT THE REQUIRED APPLICATION. SKIN TEAR RESISTANCE VARIES WITH DENSITY. DUE TO THE SEVERE BLOWING ACTION DURING VULCANISATION THERE CAN BE AN ELEMENT OF CURVE ALONG THE LENGTH AND CROSS SECTIONAL SURFACE OF THE EXTRUSION AND IS PARTICULARLY EVIDENT ON THIN WIDE STRIP. EVERY EFFORT IS MADE TO MINIMISE THIS EFFECT.
GENERAL PROPERTIES :
RESISTANCE TO ULTRA-VIOLET LIGHT, CORONA, ARCING AND OZONE IS GOOD. OXIDATION, WHICH QUICKLY DESTROYS ORGANIC ELASTOMERS IS VIRTUALLY NON EXISTENT WITH SILICONE RUBBER. WITH A LOW DEGREE OF MOISTURE ABSORPTION THE MECHANICAL PROPERTIES SHOW LITTLE CHANGE, EVEN AFTER LONG PERIODS OF IMMERSION. HOWEVER, SUPERHEATED WATER WILL CAUSE THE SILICONE TO BREAK DOWN AFTER CONTINUOUS IMMERSION. EXPANDED SILICONE POSSESSES VALUABLE NON-STICK PROPERTIES. SILICONE RUBBER IS LITTLE AFFECTED BY MOISTURE IN THE FORM OF FREE STEAM. HOWEVER, WITH INCREASED PRESSURE, EFFECTS UPON THE STRUCTURE OF THE RUBBER BECOME GREATER. EXPANDED SILICONE IS NOT RECOMMENDED FOR LONG TERM SERVICE WHERE STEAM PRESSURE EXCEEDS 50 PSI. EXPANDED SILICONE IS EXCELLENT FOR VIBRATION DAMPING, PROTECTING AND CUSHIONING COMPONENTS, SEALS AND GASKET.
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