These three new two-part high refractive index (HRI) silicone encapsulants serve the light-emitting diode (LED) market and offer increased light output, a range of hardnesses to suit a variety of applications, and reportedly superior resistance to heat, chemical and ultraviolet (UV) light exposure. These HRI encapsulants are available in three formulations, each optimized for different uses and manufacturing processes. The OE-6665 A and B offer maximum hardness along with low viscosity. The OE-6630 A and B offer a softer formulation with similarly low viscosity. The OE-6635 A and B also offer a softer composition, but with twice the viscosity. All three products are highly transparent, with a refractive index of 1.53, compared with 1.4 for other silicone encapsulants on the market. Dow Corning Corp., Midland, MI, www.dowcorning.com.
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