CONVENTIONAL SILICA

Since several decades, precipitated silica is used in rubber compounds with continuously increasing demand. In the begining, main applications have been technical rubber articles like shoe soles or products for the automotive industry. The ability to ink the finished products or their transparency were reasons for the usage of silica as well as the improved tear resistance and the increased adhesion of textile and steel cord. The potential of silica in treads of truck tires has been discovered soon in order to improve the so called Cut& Chip behavior and to reduce the heat development. Due to the implementation of the “Green Tire” in 1992 the usage of silica in tread compounds for passenger car tires increased.

An optimum reinforcement is only obtained by using silica in combination with organosilanes, such as Si 69®, Si 75®, Si 266® or VP Si 363®. The silanes form a chemical bond between silica and rubber and lead to improved reinforcement and, in particular, to optimized dynamic properties.

ULTRASIL VN 3 / VN 3 GR
ULTRASIL® VN 3 GR is a mechanically compacted granulate. On account of the granulation process it leads to less dust development during mixing.

ULTRASIL® VN 3 GR has a high reinforcing potential and imparts to rubber compounds high Shore hardness, tensile strength, tear resistance and abrasion resistance. In order to achieve optimum rubber-technical data the addition of activators like glycols, amines or other alcaline accelerators is necessary. On account of the higher surface area ULTRASIL® VN 3 GR can provide vulcanizates of excellent transparency. Application fields are: Tires, mechanical rubber goods, cables and shoe soles of all kinds.

ULTRASIL 360
ULTRASIL® 360 has a significantly lower specific surface area than highly active silicas. Due to its very good processability, ULTRASIL® 360 is particularly well suited for extrusion, calendering and injection molding compounds. It also allows the use of high levels of filler loading. ULTRASIL® 360 imparts a low compression set and excellent dynamic vulcanizate properties to mechanical rubber goods. Application fields are: Mechanical rubber goods.

ULTRASIL VN 2 / VN 2 GR
ULTRASIL® VN 2 GR is a mechanically compacted granulate. On account of the granulation process it leads to less dust development during mixing.

Due to its lower specific surface area, ULTRASIL® VN 2 GR has a slightly lower reinforcing potential compared to ULTRASIL® VN 3. It imparts to rubber compounds high Shore hardness, tensile strength, tear resistance and abrasion resistance and offers advantages concerning compound viscosity and processing. In order to achieve optimum rubber-technical data the addition of activators like glycols, amines or other alcaline accelerators is necessary. Application fields are: Tires, mechanical rubber goods.