Оптовый боросиликатный стеклянный

Main composition:

1) SiO₂: 80±0.5%

2) B₂O₂: 13± 0.2%

3) Al₂O₃: 2.4±0.2%

4) Na₂O (+K₂O): 4.3±0.2%

Chemical properties:

1) Coefficient of mean linear thermal expansion (20°C/300°C): 3.3±0.1 (10-6K-1)

2) Transformation temperature: 525±15°C3)

Working point: 1,260±20°C4)

 Softening point: 820±10°C5)

 Density at 20°C: 2.23g/cm²6)

Hydrolytic resistance at 98°C: ISO719-HGB17)

Hydrolytic resistance at 121°C: ISO720-HGA18)

Acid resistance class: ISO1776-1 9)

 Alkali resistance class: ISO695-A2

Thermal conductivity cal/cm·s°C   0.0028

Resistivity lgρ(25°C)   15

Thermal shockv resistance ΔT°C  230

specific heat capacity(0-100°C)0.195cal/g

Features

1.High Resistance to Thermal Shock

2.High Hydrolytic Resistance

3.High Chemical Resistance

4.Good processility-marking different shapes: round, flat, profiles,etc

5.Fire polished/cut neat/anneal

6.PT moulding technology

7.No wave on tube,less stone.knots

Usage

1) for lab ware glass tube

2) for solar evacuated collector tube

3) for handicraft or lighting glass tube