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. Old plastic lens can not stand heat cycle on LEDs applications，A new product Silicone resin ,which had heat and weather resistant ,could be apply on optical used.
Uncured properties :
RAY8677-A
viscosity 5000 cps
special gravity 1.01
appearance transparency
RAY8677-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
Dielectric constant(60Hz) 3.8
Color colorless
refraction 1.522
Transmittance% 92% /450nm
Shore 70 (ShoreD)
Lost on heat < 0.1%
Tension strength 20. kg/cm2
Thrinkage 0.1%
Thermal coefficint 0.32 w/m-K
Operation process :
weight Take RAY8677- A and RAY8677- B by 10:1
(weight ratio).
Defoaming place the mixture in vacuum vessel，kept
vacuum lower than 100 mg Hg.
Filler Be careful pouring silicone to the container, avoid
Occur bubble
Harden Preheating(60℃X 15 min then 100℃X 50 min) then Heating 150℃X 50 min.
