three-cavity tube

  The standard for the high borosilicate glass 3.31.Physical and Chemical PerformanceExpansion Coefficient:(32.5±0.5)×10-7/oCDensityg/cm32.23±0.02Water-resistance:First ClassAcid-resistance: First ClassAlkali-resistance: Second ClassSoftening Point: 820oCTemperature of Divitrification: 695oC-1180oC  Technical Data                      Melting Temperature(oC): 1680Forming Temperature (oC) :1260Softening Temperature (oC)830Annealing Point(oC): 560Hardness:7
three-cavity tube