The new peroxide-curing solid silicone rubber has been specially developed for extrusion of hoses. ELASTOSIL® 416/70 features superior green strength and a non-tacky surface. As a result, uncured "endless" hose blanks retain their shape during downstream processing. As it cures, the new solid silicone rubber adheres well to fabrics, forming a strong bond with them. This makes it possible to produce fabric-reinforced silicone hoses capable of providing the necessary pressure resistance. When cured, ELASTOSIL® 416/70 delivers all the advantages that typify silicones: high heat resistance and flexibility, high aging and continuous fatigue resistance.
Standard silicone elastomers are not really suitable as sealants in the hot areas of engine cooling circuits as some of their key properties relating to leak-tightness, such as elasticity and high resilience, deteriorate as soon as contact is made with coolant at temperatures exceeding 100 °C.
At K 2013, WACKER is presenting an enhanced silicone rubber for making seals that are perfectly suited to cooling systems. A platinum-cured liquid silicone rubber, ELASTOSIL® 3022/60 features very low compression set. Measurements show that the compression set of ELASTOSIL® 3022/60 is no greater than 50 percent, even after a thousand hours in a coolant at a temperature of 125 °C. In addition, the new silicone rubber exhibits very good low-temperature flexibility down to -45 °C. ELASTOSIL® 3022/60 can be injection molded with ease and thus makes cost-effective mass production of molded parts possible.