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ISO 8655-3 is a part of the ISO 8655 series of standards that specifies requirements for the use of piston-operated volumetric apparatus. Here's a summary of ISO 8655-3:

ISO 8655-3 specifically focuses on piston burettes. It outlines requirements for their performance, construction, and testing, ensuring accurate and reliable measurement of volumes. The standard covers various aspects including design, materials, dimensions, and calibration procedures.

Key points addressed in ISO 8655-3 include:

1. Construction: The standard specifies the design and materials used in the construction of piston burettes to ensure their durability and suitability for accurate volume measurement.

2. Performance requirements: ISO 8655-3 defines performance criteria such as accuracy, precision, and linearity that piston burettes must meet to provide reliable volume measurements.

3. Calibration: The standard details procedures for the calibration of piston burettes, including the use of appropriate reference standards and the determination of calibration uncertainty.

4. Testing: ISO 8655-3 outlines methods for testing piston burettes to verify their compliance with the standard's requirements. This includes tests for functionality, leakage, and repeatability.

Overall, ISO 8655-3 provides guidelines to ensure that piston burettes meet strict quality standards, enabling accurate and precise volumetric measurements in laboratory settings.