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Evonik Relaunches AEROSIL® SP Fumed Silica

Published on 2010-12-10. Author : SpecialChem

Evonik re-launched the product AEROSIL® 300 SP. The use of AEROSIL® SP fumed silica can improve the transparency of silicone rubber without sacrificing mechanical properties.

The AEROSIL® SP fumed silica grades exhibit properties of pyrogenic and morphology colloidal silicas. Still made through the pyrogenic process, the aggregate/agglomerate structure is altered and the particle size distribution is narrower than standard grades of similar surface area. This process also results in an agglomerate structure that requires less shear force to be applied to achieve equal dispersion. As this force is typically predetermined by the available equipment, this will reduce the time to properly disperse this grade of fumed silica as compared to similar surface area materials.

AEROSIL® 200 SP and AEROSIL® 300 SP have similar physicochemical properties as our established products, AEROSIL® 200 and AEROSIL® 300. There is no change in BET surface area, LoD or tapped density.

The transparency of silicone formulations mainly depends on two factors: particle size distribution of the silica and refractive index of the polymer and filler. Our structure modification process at a given particle size and BET surface area can further improve transparency of various silicone systems such as HTV, LSR and two-component silicone rubbers significantly.

About Evonik Industries

Evonik Industries is the creative industrial group from Germany. In core business of specialty chemicals, the company is one of the global leader. In addition, Evonik is an expert in power generation from hard coal and renewable energies, and one of the largest private residential real estate companies in Germany. The company's performance is shaped by creativity, specialization, continuous self-renewal, and reliability. Evonik is active in over 100 countries around the world. In its fiscal year 2009 about 39,000 employees generated sales of about €13.1 billion and an operating profit (EBITDA) of about €2.0 billion.

Working together with its customers and partners, Evonik develops products and system solutions for and with plastics. The company has a range of services that satisfies market and application requirements.

Evonik is present in all major growth markets around the globe. Its customized products and solutions include raw materials, sophisticated additives and paints, engineering plastics, high-performance polymers, and semi-finished products. They are virtually exactly what is needed for tomorrow's efficient, sustainable, and environmentally friendly ideas.

Source: Evonik


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