Dinglab,Quartz Glass Tube,Quartz Sleeve,Fused Quartz Tubing,Fused Silica Tube,Made By Vycor Glass,Thcik 1mm,5Pcs/Pack Outer Diameter 22mm 20mm 18mm 16mm 15mm 14mm 12mm 10mm 8mm Thickness is 1mm Made From Quartz Glass Quantity: 5Pcs/Lot Annealing Point ------1140℃ Linear Coefficient of Expansion------ (5.3～5.8)×10^(－7) Softening Point-----1730℃ DINGLAB Science Supply