Lh-1640 Silicone adhesive for LED light,bulb encapsulation use Introduction: lh-640 is a kind of additional type silicone gel special designed for optical encapsulating/packaging use which need stronge transpaent color and reflective properties. After cured, this silicone gel has very good reflective and transparent color and suitable for LED, lighting metal and some kinds of plastic mold side and backing coating use. , Physical properties: Uncured properties: LH-1640 Pt-100 Viscosity : 90000 cps 1000cps Color : Clear clear liquid Properties after cured : Color : transparent Hardness : 40 (Shore A) Shrinkage : 0.01% Thermal conductivity : 0.28 w/m-K Volumn resistivity: > 3.0 x 1010 ohm-cm Dielectric strength: > 12Kv/mm Operation process : Weight : Take Lh-1640A and LH-1640B with 10A:1B weight ratio well mixed. Feforming : place the mixture in vacuum vessel,kept vacuum lower than 500 mg Hg. Coating : Careful coat the silicone on the surface of the substance. During the coating process, must be careful to avoid occuring bubble. Harden : Put the coated mold into the 80 oC over for 30 min to curing.