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July 09, 2018 02:00 AM

Wacker silicone can stand 'the heat in the kitchen'

European Rubber Journal Report
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    Elastosil R plus 4350/55 is described as a silicone rubber for formulating heat-resistant, addition-curing silicone elastomers that attains optimum properties when combined with heat stabilizers.

    NUREMBERG, Germany— Wacker's presentations at DKT2018 included a new solid silicone rubber for sealing profiles and tubing used at temperatures of up to 300°C for several days.

    Elastosil R plus 4350/55 is described as a silicone rubber for formulating heat-resistant, addition-curing silicone elastomers that attains optimum properties when combined with heat stabilizers.

    "The type of stabilizer and the amount used have a significant influence on the heat resistance of the cured rubber, which is easy to process in extruders," explained Wacker.

    Heat-aging tests, it added, show that mechanical properties, such as Shore A hardness and elongation-at-break, change very little at temperatures above 200°C even after 2,000 hours.

    After it has cured, Elastosil R plus 4350/55 achieves a Shore A hardness value of 55, and is said to be suitable for manufacturing heat-resistant profile gaskets, such as for oven and stove doors or for engine-compartment parts.

    Post-cured grades, Wacker noted, comply with the requirements of the German Federal Institute for Risk Assessment and the U.S. Federal Drug Administration for food contact.

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