Borosilicate Glass is one of transparent colourless glass, through wavelength is between 300 nm to 2500 nm, transmissivity is more than 90%. Coefficient of thermal expansion is 33a. It can acidproof and alkalifast ,the high temperature resistant is about 200·c. If course handling , the high temperature resistant can reach 400·cor so. Apply to lighting fixture , chemical industry , electron, high temperature equipment and so on.