Silicone gel/rubber for optical 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.
RAY-8636H is high heat resistant additional type silicone rubber.
Uncured properties :
RAY8636H-A
Viscosity : 2500 cps
special gravity : 1.01
appearance : transparency
RAY-8636H-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
refraction : 1.412
Transmittance% : 92% /450nm
Shore : 70 (Shore A)
Heat resistance: : 260 ℃ over 30 min.
Operation process :
Weight : Take RAY8636H-A與RAY8636H-B by10:1（weight ratio）well mixed（viscosity after mixed about 2000 cps）
Defoaming : place the mixture in vacuum vessel，kept
vacuum lower than 500 mmHg.
Filler : Be careful pouring silicone to the container, avoid
occur bubble
Harden : Preheating(60℃X 15 min then 100℃X 50 min). then Curing，后150℃X 240 min.
