Silicones have extraordinary properties when exposed to extreme temperatures. Standard General Purpose grades can withstand -60°C to +200°C. With the addition of a heat stabiliser this can be increased to +250°C, and with special grades up to +300°C is possible.
Designers and Engineers are reminded that Silicone requires the presence of oxygen in order to achieve such extremes, the absence of which would suffer reversion and deteriorate at a much lower temperature.
Using Silicones at the extremes of their capabilities will naturally limit the life of the product, though heat ageing and performance would vary depending on the stresses applied at the time.
As an example, customers that want to use a Silicone product for long periods at +240/+250°C will benefit from using a +300°C Silicone rather than one for +250°C.