Temperatures of up to 300 Degrees Celsius
Specifically for such components, WACKER has launched a new line of solid silicone rubbers that synergistically interact with heat stabilizers and thus, when cured, supply an extraordinarily high heat resistance. Sold under the name ELASTOSIL® R 756, these peroxide-crosslinking silicones can withstand temperatures of 250 degrees Celsius even over long periods of time and temperatures of 300 degrees Celsius over the medium term. Long-term exposure to extreme temperatures does not affect the good resilience of the cured rubber. Their compression set, which is a measure of resilience, remains low enough for them to act as elastic seals, for example.
That’s why good resilience after exposure to extreme temperatures is a prerequisite for the use of silicone elastomers in door gaskets of self-cleaning ovens. These kitchen appliances can clean themselves at the press of a button. This is accomplished via pyrolysis – the chemical degradation of organic substances by heating in the absence of an air supply. During the cleaning program, the oven chamber reaches a temperature of approximately 500 degrees Celsius for a certain period of time. At this temperature, grease spots, spilled gravy or cooking juices and food remnants on oven trays carbonize. All that remains is a powdery layer of soot and ash, which can easily be swept up or wiped away. This saves consumers the troublesome task of cleaning the oven manually.