Thick-wall quartz glass tube has characteristics of heat resistance, corrosion resistance, good light transmission and explosion-proof. It is widely used on instrument table, liquid level display, heating tube and the producing of water-heating products. The specification includes square shape hole, circular hole, D-shaped hole, scallop hole and triangle hole. We also produce the products whose outside and inside shape both are square. We can produce the product according to the requirement of customers.