... : 200 times the glass product, almost no risk of fracture.(4)Light transmission: up to 93% transmittance excellent, soft light and ... A)Absorption Rate%0.13ASTM D 570:1998(24h IMMERSION)Thermal Expansion1/°C4.9*10KS M 3015:2003 Application:1.Lamps ... . The preparation of a variety of instrumentation dial, casing, dial. 4. Preparation of optical fiber. 5. Windows, commercial advertising billboards. 6 ...