2008-03-27 Manufacturing News

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The invisible team player for liquid silicone rubber products

Technical Information brochure for rubber products describing the specialized role of silicas during production, processing, and application of liquid silicone rubber.

LSR (liquid silicone rubber) products are used in many industries such as automotive, construction, electrical engineering, and, thanks to their easy sterilizability, also in medical technology and the food industry. The products could be tiny, light as a feather at 0.05g or they could weigh up to 80 kilos. Gigantic or minute, they have one thing in common: silica. Synthetic silicas have been known in the silicone industry for many years. Evonik has now produced a twenty page Technical Information brochure for these products describing the specialized role of silicas during production, processing, and application of liquid silicone rubber.

Which product should be used?
In principle, both fumed and precipitated silicas from the Evonik product range are suitable for the production of LSR products. But the compounds must be carefully chosen according to the properties important for processing in the particular application concerned, for example low rheology, rapid vulcanization, or good storage stability. If high-grade mechanical and optical properties are desired, only fumed silicas, which allow attainment of extraordinarily high transparencies, are used. The fumed silicas' pronounced hydrophobic (water-repellent) properties allow rapid processing and very good dispersibility, so that processing aids are unnecessary. Special hydrophobic silicas developed specifically for liquid silicone rubber applications are distinguished particularly by a very low thickening effect.

These products, whose structure has been further modified by an additional processing step, are therefore used mainly in the production of highly free flowing formulations. Other fumed silicas that are used in LSR applications are AEROSIL* 200, AEROSIL 300, and AEROSIL 380. These are water wettable or hydrophilic, and are typically used with processing aids such as Evonik silanes marketed under the Dynasylan* brand name. Precipitated silicas like SIPERNAT* 160 are used, for example, in the production of silicone rubber keyboard mats because they have good dynamic properties, notably a low compression set.

The new Evonik Technical Information describes in detail not only the properties of fumed AEROSIL*, but also the production of LSR systems and the requirements placed on the silica. A section on experimentation and product recommendations rounds off the brochure.

Additional information is available on the Evonik and Aerosil websites.

* Trademarks of the perspective owners.

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