Borosilicate 3.3 profile glass tube thermal shock,Hydrolytic, chemical resistance wide application in lighting and decoratio Borosilicate 3.3 profile tube in varing profiles Physical performanceCoefficient of mean linear thermal expansion(20,300) 3.3±0.1 10-6K-1Transformation temperature 525±15Softening point 820±10Working point 1260±20Density at 20 2.23±0.02g/cm3Mean thermal conductivity(20-100) ...