Metal Silicates are obtained by replacing a part of the acid used during the precipitation by metallic salts. In rubber mixtures these silicates offer processing and product properties which could only hardly be achieved by pure Silica.
Precipitated silica for use as reinforcement filler in the rubber industry.
ULTRASIL® 880 is a precipitated silica with a Calcium admixture and a very low specific BET surface area of approximately 35 m2/g. It gives rubber mixtures excellent residual deformation and extrusion characteristics. ULTRASIL® 880 allows profiles with virtually no swelling and a very smooth surface. Even EPDM mixtures with extremely high filling grades (up to 200 parts per hundred rubber) can still be easily processed. In white mixtures, ULTRASIL® 880 can partially be substituted for titanium dioxide. The effect of sulfur adsorption is negligible.
ULTRASIL® AS 7
Precipitated sodium aluminum silicate for use as a reinforcement filler in the rubber industry.
ULTRASIL® AS 7 is a precipitated aluminum silicate with a low specific BET surface area of approximately 60 m2/g. It combines medium reinforcement properties with particularly trouble-free handling and processing. The latter allows for higher filler parts than would be possible with highly active precipitated silica. Blending with ULTRASIL® VN 3 or inactive fillers makes it possible to adjust the reinforcement effect within a wide range.