... and water 3. Sample for free 1. Manufacturing process Furnace: Automatic temperature control ,≥1200°c;There production lines.The borosilicate glass product ... conductive .The borosilicate glass tube ,its Melting temperature is1680°C,Softening temperature is 830 °C ,Coefficient of thermal expansion is 3.3×10-6K ... for processing high-grade daily necessities 5.The package . teapot, borosilicate 3.3 glass