MUNICH—Wacker A.G. is expanding its product range with a new liquid silicone rubber for the production of automotive gaskets.
Molded parts made from the new silicone are resistant to heat and coolant and exhibit low compression set even under permanent stress. Elastosil RT 728, as the new silicone grade is called, can be injection molded or mechanically dispensed straight onto the part to be sealed.
The firm said gaskets made from Elastosil RT 728 exhibit no more than 30 percent compression set after 1000 hours in coolant at a temperature of 105°C. After 1000 hours at 125°C, the permanent deformation is still less than 65 percent as soon as the stress is removed.