- Functions:Reinforcement
- Chemical Family:Silica
- Features:Smooth Surface Finish, Good Extrusion Properties, Good Compression Set, Low Die Swell, Good Processability
- Synonyms:Calcium hydrosilicate, Calcium monosilicate, Calcium polysilicate, Calcium silicate, E 552
ULTRASIL® 880 is a precipitated silica that contains a calcium admixture and has a very low specific N2 surface area of approximately 35m²/g. When added to rubber mixtures, it provides excellent residual deformation and extrusion characteristics. ULTRASIL® 880 also enables the creation of profiles with minimal swelling and a very smooth surface. Even EPDM mixtures with extremely high filling grades (up to 200 parts per hundred of rubber) can still be processed with ease. In white mixtures, ULTRASIL® 880 can be used in partial substitution for titanium dioxide. The impact of sulfur adsorption is negligible.