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optical moulding | Technology


technology is generating tremendous interest from OEMs along the entire LED value chain and opening new horizons of reliability and applications,” says Eric Peeters, vice president of Dow Corning Electronic Solutions. The company offers a number of special optical products within its Xiameter line of silicones. Wacker’s Lumisil LR7600 series of liquid silicones -


Above: Arburg says over- moulding can reduce cycle time for


production of thick LED


lenses, such as these PMMA parts


additions include the Lux-G line, which is formulated to provide the long term heat ageing performance required for long lifetime LED systems, and the Lux-T line, which is designed to minimise the risk of bubble formation in parts with large wall thickness differences. Bayer MaterialScience also offers PC grades optimised for LED optics. Its Makrolon LED2643 grade is said to offer high levels of light transmission along with the stability to heat and high fl ux required for use with LED light sources. It also carries an f1 rating for outdoor use in accordance with the UL 746C standard. For ap plications requiring fi re retardance, the company has developed Makrolon FR7087, a transparent polycarbonate suitable for lenses and covers that carries UL 94 5VA fl ame resistance rating at 3.0 mm.


Flexible thinking on materials Meanwhile, Dow Cornin g of the US and Wacker of Germany are both promoting LSR for LED optical applications. Silicones are already widely used to produce the simple domed cap over the LED chip. However, both companies believe the unique processing and performance properties of specially developed optical LSR grades will challenge PC and PMMA in more complex secondary optic applications. “As designs of LEDs and LED lamps and luminaires rapidly become more sophisticated, optical silicone


available in four hardness values between 50 and 80 Shore A – have been specifi cally developed for LED and optical applications. The LSR products offer high transparency to visible light, can withstand tempera- tures up to 200˚C, and are said to show no tendency to yellow after extended exposure periods. As the LED lighting market matures, applications


will inevitably become more complex and it seems designers and producers will need to select from an ever widening range of processes and materials to come up with the most cost-effective and best perform- ing solutions. As Carclo’s Grassi puts it: “New solutions will drag further innovation. That will lead to more clever designs and more complex mechanical limita- tions in what we are trying to achieve. Yes, I would defi nitely say things are going to get more complex.”


Click on the links for more information:  www.carclo-ctp.comwww.arburg.comwww.altuglas.comwww.kc-wzb.de (Kronacher)  www.ewikon.comwww.fpt.dewww.engelglobal.comwww.krallmann.dewww.materialscience.bayer.comwww.sumitomo-shi-demag.euwww.gwk.comwww.sabic-ip.comwww.dowcorning.comwww.wacker.com


AMI Strategy Seminars


These one-day seminars are given by an AMI director and provide invaluable insights into market trends and industry strategies. They are held in small groups and provide ample opportunities for questions and discussions.


15 October 2013: Cologne, Germany 30 October 2013: Philadelphia, USA 9 December 2013: Dubai, UAE


Contact: Katy Cheng, kb@amiplastics.com, +44 117 924 9442 www.amiplastics.com/seminars


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