ISO 18787:2017

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Foodstuffs — Determination of water activity

Published By	Publication Date	Number of Pages
ISO	2017-11	14

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Categories: 67.050 - General methods of tests and analysis for food products, ISO

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Description

ISO 18787:2017 establishes basic principles and specifies requirements for the methods of determining water activity (a_w) of food products for human consumption and animal feed within a measurement range of 0 to 1.

The measurement principles are based on the dew-point measurement or on the determination of the change in electrical conductivity of an electrolyte or in the permittivity of a polymer.

The method does not apply to products stored below their freezing point (equivalent to the temperature at which ice crystals appear in the product), neither to products corresponding to a water-in-fat emulsion, nor to crystal products such as sugars, salt or minerals.

For products containing volatile compounds, such as alcohols, specific equipment adaptations may be necessary to apply the method.

The results of the interlaboratory studies that were carried out are given in Annex B.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	2017-11
Pages Count	14
Language	France
Edition	1
File Size	307.2 KB
ICS Codes	67.050 - General methods of tests and analysis for food products

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ISO 18787:2017

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