02/10/2014

www.gupta-verlag.de/rubber

Heat-resistant solid silicones for automotive and household appliances

Depending on the heat stabiliser added during compounding, the vulcanisates can withstand temperatures up to 300 °C, even over relatively long periods of time. The new silicone grades also offer a low compression set. As a result, components made from Elastosil R 756 maintain a good seal. This makes these new grades ideal for use in self-cleaning ovens and stoves or in automotive applications such as the engine compartment.According to Wacker, the new grades are designed in such a way that their properties unfold by interaction with the heat stabilisers added to the base rubber during the compounding process. The thermal stability of the vulcanisate is influenced by the type and amount of the chosen stabiliser. The new grades can be processed via compression moulding, injection moulding or extrusion.The latter method, however, requires the use of a suitable heat stabiliser that is compatible with the crosslinker. Elastosil R 756 is offered both as a base rubber blend without additives and as ready-to-process compounds that already contain effective heat stabilisers. The new product line currently includes two grades that can be processed to elastomers with hardness values of 60 or 70 Shore A. Other hardness grades are currently being developed.

www.gupta-verlag.de/rubber