The latest update to the ASTM E544 standard has been published as ASTM E544-24, effective from 6 September 2024. This update revises the previous ASTM E544-18 standard, which was issued in 2018. The original ASTM E544 standard was first introduced in 1999.
ASTM E544-24 provides essential guidelines for referencing the odour intensities of odorants within the suprathreshold region, using the ASTM Odour Intensity Referencing Scale. The updated standard continues to outline two primary methods for this purpose:
- Procedure A (Dynamic Scale Method): Utilises a dynamic-dilution apparatus equipped with sniffing ports to deliver constant concentrations of the reference odourant, 1-butanol (n-butanol), at stable volumetric flow rates.
- Procedure B (Static Scale Method): Involves using Erlenmeyer flasks containing known concentrations of 1-butanol in water.
These methods ensure consistent comparisons between the test sample and a series of 1-butanol concentrations, providing odour intensity measurements.
The reasons for the update from ASTM E544-18 to ASTM E544-24 have not been detaileddetailed.
For more information and to access the full updated standard, visit the ASTM website.
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