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