ISO 18787:2017

ISO 18787:2017

November 2017
International standard Current

Foodstuffs - Determination of water activity

ISO 18787:2017 establishes basic principles and specifies requirements for the methods of determining water activity (aw) 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.

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Main informations

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International ISO standards

Publication date

November 2017

Number of pages

9 p.

Reference

ISO 18787:2017

ICS Codes

67.050   General methods of tests and analysis for food products

Print number

1
Sumary
Foodstuffs - Determination of water activity

ISO 18787:2017 establishes basic principles and specifies requirements for the methods of determining water activity (aw) 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.

Replaced standards (1)
ISO 21807:2004
September 2004
International standard Cancelled
Microbiology of food and animal feeding stuffs - Determination of water activity

<p>ISO 21807:2004 gives basic principles and requirements for physical methods of determining the water activity of products intended for human consumption and the feeding of animals.</p> <p>Water activity can be used to predict microbial growth and determine the microbiological stability of a food product, and it also provides an important, quantitatively determinable criterion for estimating the times for which a foodstuff can be kept.</p>

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