Material 

High COE3.3 borosilicate glass

Color

clear,amber, dark blue, green, purple, pink, black , white

Outside Dimaeter 

5-315mm, 

Wall thickness 

0.8-9mm 

Package

carton

Physical performance

Numerical Value

Coefficient of mean linear thermal expansion(20°C,300°C)

3.3±0.1 10-6K-1

Transformation temperature

525±15 °C

Softening point

820±10 °C

Working point

1260±20 °C

Density at 20°C

2.23±0.02 g/cm3

Mean thermal conductivity(20°C-100°C)

1.2 w/m2k

Refractive index

1

Main Composition

SiO2: 81   B2O3:13   Na2O+K2O: 4     Al2O3: 2

Hydrolytic resistance at 98°C

ISO719-HGB 1

Hydrolytic resistance at 121°C

ISO720-HGA 1

Acid resistance Class

ISO1776-First Class