Borosilicate Clear Glass borosilicate glass tubes are widely used in the laboratories, chemical factories

Borosilicate Clear Glass Physical data sheet No. Physics performance Numerical Value Unit 1 coefficient of mean linear thermal expansion(20ºC;300 ºC) 3.3±0.1 10-6 K-1 2 Transformation Temperature 525±15 ºC 3 Softening point 820±10 ºC 4 Working point 1260±20 ºC 5 Density at 20ºC 2.23±0.2 g/cm2 6 Mean thermal conductivity(20ºC-100ºC) 1.2 W/m.K 7 Refractive Index 0.92 l Chemical Composition in approximate weight %( main components) Item . SiO2 B2O3 AL2O3 Na2O +K2O % 81 13 2 3.08                                                                            Chemical Data:Hydrolytic resistance at 98ºC          ISO719-HGB 1Hydrolytic resistance at 121ºC         ISO720-HGB 1water resistance                       Grade 1              Test method: ISO1776Acid resistant Class                   Grade 1              Test method: ISO1776

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