Glass Burettes

Class A burettes meet ISO 385 tolerances and carry individual batch certificates, making them the correct choice for pharmacopoeial assays, standardisation, and any titration where results must be traceable. Class B burettes have tolerances twice as wide and are suitable for routine school practicals and non-critical work where a certificate is not required.

PTFE rotaflow stopcocks require no grease, are chemically resistant to most acids and solvents, and are the standard choice for general laboratory use. Glass stopcocks are preferred when the reagent attacks PTFE or when very high operating temperatures are involved. For everyday titration work, the grease-free convenience of PTFE is the practical choice.

A 50 mL burette is the standard for most school and university titrations. Use a 25 mL burette when reagent economy matters or when working with expensive titrants. A 10 mL microburette is suited to micro-scale titrations where small sample sizes require higher precision per graduation. The smaller the capacity, the finer the graduation intervals and the more precise the reading.

Borosilicate glass burettes resist most laboratory acids, bases, and organic solvents. They are not suitable for hydrofluoric acid or prolonged use with hot concentrated alkali, which etches borosilicate glass over time. PTFE stopcocks are compatible with a wider range of reagents than glass keys, but if the reagent attacks PTFE, specify a glass stopcock when ordering.

Our glass burettes meet Class A (Grade A) accuracy as defined by ISO 385, which specifies tolerances for laboratory volumetric glassware. Class A burettes carry individual calibration certificates and are suitable for pharmacopoeial work, standardisation, and all analytical titrations requiring traceable accuracy.

PTFE (Teflon) stopcocks require no grease and resist most solvents and acids, making them the preferred choice for general laboratory use. Glass stopcocks are chemically inert across a wider temperature range and are required where PTFE's operating limits are a concern, such as in very high-temperature applications.

Rinse burettes with distilled water immediately after use. Store vertically in a burette stand with the stopcock open to prevent the bore from seizing. Inspect the stopcock for chips or cracks before each use, and never heat a sealed burette.

Yes. SmartLabs supplies Class A glass burettes in bulk to schools, colleges, and university chemistry departments. Contact us for a quote on set quantities with matching burette stands, clamps, and funnels.