3.3×10⁻⁶/K
Borosilicate Glass 3.3 / 硼硅玻璃 3.3
Lab-grade heat-resistant borosilicate, CTE 3.3×10⁻⁶/K — the industry baseline
Physical & chemical properties
| Parameter | Value |
|---|---|
| 线膨胀系数 (20–300℃) Linear expansion (20–300℃) | 3.3×10⁻⁶/K |
| 软化点 Softening point | 820 ℃ |
| 最高使用温度（连续） Max service temp (continuous) | 500 ℃ |
| 最高使用温度（短时） Max service temp (short) | 600 ℃ |
| 耐温急变 ΔT Thermal shock resistance | ≈200 ℃ |
| 密度 Density | 2.23 g/cm³ |
| 透光率 Visible transmission | ≥90% |
| 耐水性 (ISO 719) Hydrolytic resistance | HGB 1 级（最高） |
| 耐酸性 Acid resistance | 优 (ISO 1776) |
| 耐碱性 Alkali resistance | 中 |
| 对应标准 Standards | DIN 58920 / ISO 3585 / ASTM E438 I |
Selection note Direct flame and oven safe; avoid prolonged contact with HF and hot concentrated alkali.
Typical applications
Reactors, condensers, distillation apparatus, chromatography columns, separatory funnels, ground-glass joints — the default for heating, thermal cycling and chemical exposure.
Usage notes
Direct flame and oven safe; avoid prolonged contact with HF and hot concentrated alkali.