Boro Glass Tube

transparent borosilicate glass tubing, pyrex glass tube
Physical performance
Coefficient of mean linear thermal expansion(20,300)   3.3±0.1 10-6K-1
Transformation temperature                                        525±15
Softening point                                                          820±10
Working point                                                           1260±20
Density at 20                                                            2.23±0.02g/cm3
Mean thermal conductivity(20-100)                             1.2w/m2k
Refractive index                                                         0.92
Main Composition
SiO2                     81
B2O3                    13
Na2O+K2O       4
Al2O3                    2
Chemical Property
Hydrolytic resistance at 98         ISO719-HGB 1
Hydrolytic resistance at 121       ISO720-HGA 1
Acid resistance Class                ISO1776-First Class