RAY-8638 Silicone Rubber for LED light,bulb encapsulation use RAY-8638 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 : RAY8638-A viscosity 2500 cps special gravity 0.98 appearance transparency RAY8638-B viscosity 3000 cps special gravity 0.98 appearance transparency Properties after cured : Volume resistivity > 1.0 x 1015 ohm-cm Dielectric strength > 20 Kv/mm Color colorless refraction 1.412 Transmittance% 96% /450nm Shore 85 (Shore A) Lost on heat < 0.3% Operation process : weight Take RAY8638- A and RAY8638- B by 10:1 (weight ratio). Viscosity about 2500 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.
