Burettes in Titration: Why Class A Accuracy Matters

Burettes are central to titration work, where even the smallest deviation in volume can change the outcome of an experiment. Whether in research, education, or industry, choosing a burette with the correct accuracy class ensures reliable and reproducible results. For Australian laboratories, BORO 3.3 borosilicate burettes with PTFE stopcocks are the standard for durability and performance.

Class A burettes, calibrated according to ISO 385 and ASTM E287, provide the highest accuracy with the tightest tolerances. They are essential for analytical chemistry, pharmaceutical testing, and quality control labs, where data integrity is critical. Class B burettes, while less precise, are suitable for teaching environments where cost-effectiveness and durability may be prioritised over exact measurement.

The choice of stopcock also affects performance. PTFE keys offer chemical resistance and smooth operation, reducing the risk of leakage during titration. Glass stopcocks, though traditional, require more maintenance and may be less durable under heavy use. LabChoice Australia supplies a full range of Class A burettes, ensuring compliance with ISO and ASTM standards while maintaining affordability for education and industry alike.

FAQs

What is the main difference between Class A and Class B burettes?
Class A offers tighter tolerances and higher accuracy, required for professional and research use.

Why is BORO 3.3 glass important in burettes?
It provides chemical resistance and stability under repeated cleaning and use.

Are PTFE stopcocks better than glass?
Yes, PTFE is more durable, chemical-resistant, and easier to maintain.

Which burettes are best for teaching labs?
Class B burettes are often chosen for cost-effectiveness, but many schools also use Class A for consistency.

Do LabChoice burettes comply with international standards?
Yes, they are manufactured to ISO 385 and ASTM E287 specifications.

References

• ISO 385: Laboratory Glassware – Burettes
• ASTM E287: Standard Specification for Laboratory Glass Burettes
• ACS Laboratory Analytical Chemistry Guidelines
• University of Melbourne Chemistry Laboratory Manual
• NIST Burette Calibration Standards