Borosilicate 3.3
Low thermal expansion borosilicate glass with high chemical and thermal-shock resistance — the standard for laboratory glassware exposed to heat and reactive media.
Compliance
Standards & Materials
Zenstra products are organized by material, applicable standards, and technical use case so buyers can identify the correct configuration quickly.
Materials
Glassware is offered in the following base materials. Material selection determines thermal, chemical, and mechanical suitability for a given application.
View Borosilicate 3.3 glassware →
Standards
Applicable standards are listed per product. Use the links below to filter the catalog to products conforming to a specific designation.
ISO
DIN
ASTM
Technical reference
Graduation & tolerance guidance
Graduated glassware produced to ISO and DIN standards carries defined volumetric tolerances at each graduation mark. Class A ware meets the tighter limit (typically half the Class B tolerance) and is suitable for precise quantitative analysis. Class B ware is adequate for general preparation work. All Zenstra graduated items state the tolerance class, graduation interval, and the temperature reference (20 °C) on the product label in accordance with the applicable standard.
Material properties
Autoclaving & chemical resistance
Borosilicate 3.3 glassware is routinely autoclavable at 121 °C, 1 bar overpressure for standard sterilisation cycles. The material exhibits hydrolytic resistance Class 1 per ISO 719 and high resistance to most acids, alkalis, and organic solvents. Exceptions include hydrofluoric acid and concentrated phosphoric acid above 110 °C. Soda lime glass is not recommended for autoclaving or thermally demanding applications. Specific chemical compatibility data is available on individual product pages.