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WACKER at K 2013: to Launch POWERSIL® 570 PLUS, a Solvent-free Silicone Coating for Insulators

Published on 2013-07-02. Author : SpecialChem

MUNICH -- WACKER, the Munich-based chemical group, will feature a new silicone coating for electrical insulators at the 19. International Trade Fair for Plastics and Rubber K 2013. The POWERSIL® 570 PLUS solvent-free one-component emulsion serves to coat glass or porcelain insulators. The product is sprayed on glass or porcelain parts and then cures to form a water-repellent silicone coating. The coating considerably increases the reliability and fail-safe characteristics of insulators for transmission and distribution (T&D) substations and overhead power lines. K 2013 takes place in Düsseldorf, Germany, from October 16 to 23.

Porcelain insulators coated with POWERSIL® 570 PLUS during the salt-fog test. WACKER, the Munich-based chemical group, is presenting this solvent-free silicone coating at K 2013. The product is permanently erosion-resistant and thus suitable for outdoor use in the T&D sector.

Insulators made of glass or porcelain are often used to insulate outdoor power lines. However, these kinds of insulators can quickly get dirty in coastal areas and industrial regions with high levels of air pollution, which may have serious consequences in terms of safety. Dirt, dust or salt deposits can influence the insulating capacity of such materials, particularly when moisture is present. This results in electrical discharges or even so-called pollution flashover.

To avoid this scenario, dirty porcelain and glass insulators must be cleaned regularly, which is complex and expensive. That is why WACKER, the Munich-based chemical group, has been offering specialty silicone coatings for glass and porcelain insulators for many years. Such coatings are not just excellent insulators, they are also highly hydrophobic (i.e. water-repellent). The silicone coating's long-term water-repellent effect even extends to deposits that can form on the insulator's surface over the years. It enables silicone coatings to reliably prevent the formation of wet pollution layers. Thus, the typical flashover scenario - wet film layer with an increased leakage current, dry band arcing, bridging of individual insulator sheds and finally the electrical flashover - is impossible.

With POWERSIL® 570 PLUS, WACKER is marketing the first insulator coating based on a patented silicone-in-water emulsion technology. The ready-to-use product is solvent-free and free of tin-containing constituents. Its viscosity displays a strong dependence on its shear rate, which leads to perfect spray behavior. The emulsion coating can be applied in a single spray cycle in the desired final layer thickness.

POWERSIL® 570 PLUS adheres to ceramic and glass substrates without adhesion promoters and displays excellent hydrophobic properties. Insulators coated with POWERSIL® 570 PLUS reliably pass the 1,000-hour salt-fog test as per IEC 62217. This test is considered the most important criterion for the safe outdoor use of electrical insulating materials in the T&D sector.

About WACKER

WACKER has a global network of production sites spanning all key regions. 16,300 employees on five continents devise innovative solutions locally for maximum customer benefit and generate synergies for efficient collaborations. To this end, WACKER maintains and further develops an integrated management system in accordance with ISO, GMP and sustainable development, as well as actively participate in the global Responsible Care® program .

Source: WACKER


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