borosilicate color glass tube
Crystal Chen
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Basic Information
| Place of Origin | Hebei China (Mainland) |
|---|---|
| Brand Name | TIANYUAN |
| Model Number | opaque black |
Main composition: a) SiO2: 80 ±0.5% b) B2O3: 13 ±0.2% c) Al2O3: 2.4 ±0.2% d) Na2O (+K2O): 4.3 ±0.2%Chemical properties: a) Coefficient of mean linear thermal expansion (20/300 °C):3.3±0.1 (10-6K-1)b) Transformation temperature: 525±15°C c) Working point: 1,260 ±20°C d) Softening point: 820 ±10°C e) Density at 20°C: 2.23g/cm²f) Hydrolytic resistance at 98°C: ISO719-HGB1g) Hydrolytic resistance at 121°C: ISO720-HGA1 h) Acid resistance class: ISO1776-1 i) Alkali resistance class: ISO695-A2
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