High Temperature Resistant Clear Quartz Glass Tube No Bubbles Fused Silica Pipe for Semiconductor Diffusion Furnace Product Characteristics SiO₂ Content 99.9% Density 2.2 g/cm³ Hardness (Moh's Scale) 6.6 Melting Point 1732℃ Working Temperature 1100℃ Max Short-term Temperature 1450℃ Visible Light ...