Description

Borosilicate glass 3.3

1.Property: Hight resistant to chemical corrosion and temperature change (thermal shock)

2.Application: Used for laboratory ware (test tubes, etc), domestic cooking ware (oven dishes, etc), high-power lamps and other technical glass wares, borosilicate glass 3.3 serves as a material of true function and wide application

3.Chemical Composition

SiO2: *1%
B2O3: *3%
Na2O+K2O:4%
Al2O3: 2%

4.Chemical Data
 
Hydrolytic Resistance at *8℃ ISO***-HGB 1
Hydrolytic Resistance at **1℃ ISO***-HGA 1
Acid Resistance Class ISO****-First Class
Effects of a Boiling Aqueous Solution of Mixed Alkalis (in accordance with ISO **5) A2 or better
 
 
5.Physical Property
                        
                   According to ISO ***5 and CSN ISO ***5 standards
Physical Performance Numerical Value Unit
Coefficient of Mean Linear Thermal Expansion(ISO ***1) 3.3±0.1 ***6K*1
Transformation Temperature **5±*5 â„ƒ
Softening Point (ISO *****6) **0±*0 â„ƒ
Working Point (ISO *****2, ISO *****5) ***0±*0 â„ƒ
Upper Cooling Temperature (ISO *****7) **0 â„ƒ
Lower Cooling Temperature (ISO *****7) **0 â„ƒ
Density at *0℃ 2.*3±0.*2 g/cm3
Thermal Conductivity (*0℃****0℃) 1.2 w/m2K
Specific heat capacity at constant pressure 0.8× **3  J×/Kg•K
Modulus of elasticity *4 × **3 MPa
Tensile strength *****0 MPa
Poisson constant 0.2 
Refractive Index 0.*2