Continuous melting opal quartz glass tube 

-Outer Diameter:5-30mm 

-Wall Thickness:1.5-5mm 

-Elements: Fe: 0.8ppm, Li: 0.8ppm,Al:25ppm, K:1.2ppm, Na: 2ppm Ca:0.8 Mg:0.25 

-Application:Infrared lamp,electrical heating tube