Last updated: 2026-11-05
Bottom line. The metric that matters for borosilicate 3.3 is its coefficient of linear expansion, (3.3±0.1)×10⁻⁶/K, which corresponds to a thermal shock resistance of 280°C. Soda-lime glass sits at roughly 9.0×10⁻⁶/K and about 120°C. The lower the expansion coefficient, the less likely the glass is to crack under rapid temperature change. If a vessel is directly heated, repeatedly autoclaved, or moves quickly between hot and cold, the material premium is a predictable insurance cost. For room-temperature holding and transfer, the standard low-borosilicate configuration is sufficient.
All figures below come from our Glassware page, which states data based on ISO 3585.
| Property | Borosilicate 3.3 | Soda-lime |
|---|---|---|
| Coefficient of expansion | (3.3±0.1)×10⁻⁶/K | ~9.0×10⁻⁶/K |
| Thermal shock | 280 °C | ~120 °C |
| Softening point | ~820 °C | — |
| Light transmission | >92% | — |
| Chemical stability | Excellent | Moderate |
Glassware is supplied with borosilicate 3.3 as the main material; reagent, dropping and screw-cap bottles are low-borosilicate as standard, with borosilicate 3.3 available as an upgrade. The exact material is confirmed on each product page.
This is a use-case match rather than a cost compromise: ambient holding and transfer do not require 3.3, whereas heating, autoclaving and rapid thermal cycling do.
No. The difference lies in expansion coefficient and thermal-shock ceiling — a difference in application, not in quality tier.
No. Identification depends on the material stated on the product page, not on clarity or hand-feel. RichTech states the actual material on every product page.
Vessels of different materials can coexist. What deserves attention is a single ground-joint assembly — where expansion coefficients differ substantially, fit precision may be affected under temperature change.