The company can supply high borosilicate glass series, such as H-PZ33, H-PZ36 and H-PZ48, which the thermal expansion coefficient range is (3.3-4.8)×10^-6（K^-1）. This kind of glass has excellent heat resistance, chemical stability, mechanical property and permeability. The products include lamp cup, lamp cover, and gobs, strips & casting blocks for lamp lens. It is widely used in general and special lighting, projection, automotive, astronomy and other industries.