4.0–5.0×10⁻⁶/K
High-Borosilicate Glass / 高硼硅玻璃
Domestic high-borosilicate (5.0 class) — balanced heat resistance & cost
Physical & chemical properties
| Parameter | Value |
|---|---|
| 线膨胀系数 (20–300℃) Linear expansion (20–300℃) | 4.0–5.0×10⁻⁶/K |
| 软化点 Softening point | ≈820 ℃ |
| 最高使用温度（连续） Max service temp (continuous) | 450 ℃ |
| 耐温急变 ΔT Thermal shock resistance | ≈150 ℃ |
| 密度 Density | 2.27 g/cm³ |
| 透光率 Visible transmission | ≥90% |
| 耐水性 (ISO 719) Hydrolytic resistance | HGB 1–2 级 |
| 对应标准 Standards | GB/T 15726 / QB/T 5160 |
Selection note Tolerates daily thermal cycling; for precision measurement prefer Borosilicate 3.3.
Typical applications
Heat-resistant drinkware, some lab beakers/cylinders, coffee pots, sight glass, semi-industrial heat parts.
Usage notes
Tolerates daily thermal cycling; for precision measurement prefer Borosilicate 3.3.