09/25/2013

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Momentive: UV-curing LSR

The displayed Engel e-mac 170/50, including the viper 6 robot, is set up as a standard plastics injection moulding machine (see also p. 165 et seqq.). The Elmet mould is designed to cure the LSR by UV light transmission through the pre-moulded PP part, enabling the cold curing process in short cycle time. Another innovation is Elmet's dedicated pumping and feeding equipment, optimised for UV-curing LSR.The UV-curing LSR has expanded the range of design possibilities involving multi-component injection moulding. Traditionally, two-component or multi-component designs using silicone elastomers had been limited to the combination of heat stable resins such as PA or PBT due to the moulding temperatures that were required to vulcanise the silicone. Now, UV-curing LSR can be combined with more affordable, lower melting point resins such as PP, enabling new concepts.  Designers can explore new integrated material approaches in devices such as valves, syringe components, lab ware, diagnostic devices, catheters, respiratory devices, and kitchenware, or they can develop totally new products.Other new products include the ultra clear Silopren LSR 7000 series for applications where the combination of high transparency, excellent heat and radiation resistance with high yield production in low cycle times is relevant. These types of applications include automotive lighting, electronics, and interior/exterior lighting. The Silopren oil-bleed LSR 3696/25 is a self-lubricating material with low compression set, low hardness and low modulus, well-suited for example for mat seals in connector applications. With the introduction of its new Silplus HT grades, Momentive adds high consistency rubber (HCR) bases with high heat resistance to its Silplus portfolio. The new grades, available in 40, 70 and 80 Shore A hardness, can enable the development of highly heat-stable silicone compounds for a variety of applications with heat exposure from 200?-?300 °C. Potential applications include pressure hoses such as in turbocharger systems, seals and gaskets for aerospace and aviation, as well as mould making with jewellery casting, for example. Momentive has also developed a new fibre-reinforced LSR. Targeted at the consumer market, sample testing has indicated that the use of this LSR may be in compliance with applicable FDA regulations and ISO 10993. Momentive recommends the fibre-reinforced LSR as a good solution to consider where elastomeric properties have to be combined with very high modulus at low elongations.The company will also inform about its coatings range including Silfort UVHC5000 Hardcoat with improved weatherability to protect for example clear polycarbonate parts against abrasion, chemical damage, and UV degradation. Potential fields of application include headlamp lenses for forward lighting and exterior architectural sheets. Other Silfort products are recommended for uses in wind­shields for motorcycles, ATVs and golf carts, as well as helmet visors (FHC615), on printed surfaces  for use in applications such as architectural products and signage (UVHC9000), or as hardcoats for PC and PMMA surfaces (PHC XH100).Hall 8a, stand G45

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