What is ISO 4787 about?
ISO 4787 provides methods for the testing, calibration, and use of volumetric instruments made from glass and plastic to obtain the best accuracy in use.
ISO 4787 is applicable to volumetric instruments with nominal capacities in the range of 100 μl to 10 000 ml. These include single-volume pipettes, graduated pipettes, burettes, volumetric flasks, and graduated measuring cylinders.
Note1: ISO 4787 provides methods that are not intended for testing volumetric instruments with capacities below 100 μl such as micro-glassware.
Note2: ISO 4787 does not deal specifically with pycnometers
ISO 4787 specified procedures for the determination of the volume of glassware can also be followed for the determination of a pycnometer volume.
Who is ISO 4787 for?
ISO 4787 on volumetric instruments is applicable for:
- Laboratory glass manufacturers and suppliers
- Volumetric instruments manufacturers
Why should you use ISO 4787?
Volumetric glassware calibration is essential to ensure accurate results in all laboratory settings.
ISO 4787 specifies the general procedure for testing the capacity (volume) and for use is based upon a determination of the volume of water, either contained in or delivered by the volumetric instrument. This volume of water is based upon knowledge of its mass under consideration of buoyancy and its density (gravimetric method).
ISO 4787 provides methods for calibration which will help you manufacture volumetric instruments compliant with regulatory authorities which ensures reliable products.
What’s changed since the last update?
BS EN ISO 4787:2021 supersedes BS EN ISO 4787:2011, which is withdrawn.
The main changes BS EN ISO 4787:2021 compared to the BS EN ISO 4787:2011 are as follows:
- New information on meniscus adjustment of the convex meniscus has been added; namely, the altered procedure “upper edge of the graduation line is horizontally tangential to the highest point of meniscus” as compared to older procedure “upper edge of the graduation line is horizontally tangential to the lowest point of the meniscus”
- New test room ambient conditions have been added
- New information regarding repeatability and uncertainty has been added