glass shell 1) Made from borosilicate 4.0 glass 2) Used for HID lamps. 3)Machine blowing glass shell1.Material: high borosillicate glass 4.02.Used for HID lamps3.Machine blowingWe manufacture borosilicate lighting glass shell, The total output of machine-blowing hard bulbs, sealing glass tubes and energy saving light tubes can reach 30,000tons per year, Now, the company has reached the advanced ...