Transparent quartz tube is made of high purity crystal sand. It was pulled out from high temperature melting furnace. (similar to GE214, GE219, SG25 )

The surface of this kind of tube is smooth and the tube is colorless. The properties of the tube are: High purity(SiO2>99.99% ); Abrasion resistance(except hydrofluoric acid & hot phasphoric acid); Fire resistance(softening point 1700 centigrade); Low coefficient of thermal expansion(5.5x10-7/centigrade, heat the tube to around 1100 centigrade, then put it into ordinary temperature water, the tube won't crack); Transmission of light (penetration efficiency of visible radiation over 93%), transmit ultraviolet; Excerllent insulating property; Long usable life, no contamination. It is widely used in heating, lighting, electronics, semiconductor, ptical fiber field and so on. 

Specifications can be made by the requirement of customers. 

Normal sizes: 8x16mm 11x23mm, 15x32mm