Ray - 8637 Silicone Rubber for LED light,bulb encapsulation use Introductions : Due to the energy saver, best brightness and higher powder LEDs was applied on very field,as general illumination backlight for LCD, and Automotive light. In encapsulation epoxy resin can not stand heat cycle on applications，A new product Silicone rubber ,which had heat and weather resistant ,could be apply on electric circles and LEDs used. Uncured properties : RAY8636-A viscosity 1500 cps special gravity 1.01 appearance transparency RAY8636-B viscosity 1500 cps special gravity 1.01 appearance transparency Properties after cured : Volume resistivity > 1.0 x 1015 ohm-cm Dielectric strength > 20 Kv/mm Color colorless refraction 1.412 Transmittance% 95% /450nm Shore 75 (ShoreA) Lost on heat < 0.2% Tension strength 12. kg/cm2 Shrinkage 0.2% Operation process : weight Take RAY8637- A and RAY8637- B by 10:1 (weight ratio). Viscosty about 1500 cps after mixed Defoaming place the mixture in vacuum vessel，kept vacuum lower than 500 mg Hg. Filler Be careful pouring silicone to the container, avoid occur bubble Harden Preheating 100℃X 50 min. then Curing 150℃X 240 min.
