Range of 1.

This design specification of the glass composition and performance.

This design is suitable for the company's production of glass products, such as glass shell, chimney provides reference materials of glass quality and technical requirements.

2. The chemical composition and performance requirements

2.1 chemical composition in accordance with the following requirements: (%)

SiO2:72.0 + / - 1.0 Al2O3:72.0 + / - 0.5 CaO: 6.0 + / - 0.5

MgO style: 2.8 + / - 0.5 B2O3:2.8 + / - 0.2 Na2O: 15.0 + / - 0.5

K2O: 0.5 + / - 0.3 Fe2O3: < 0.5

2.2 performance meet the following requirements:

: expansion coefficient alpha = (90 + 2) x 10-7 t - 1

Softening temperature, Tf = (675 + 20) ℃

Volume resistivity (TK100 ℃) : > 210

Specific gravity (gamma) : 2.9 ~ 2.5 (g/cm3)

Thermal stability: 120 ℃ or higher

The level of resistance to water chemical stability: 4

Glass color: colorless, transparent

3. Raw material:

Quartz sand, soda ash, dolomite, feldspar, fluorite, sodium nitrate, borax, compound clarifying agent