1) manufacture 2) creative profile 3) delivery time is short composition:1) SiO2: 80±0.5%2) B2O3: 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 ...
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