EN ISO 12571:2013

Foreword
1 Scope
2 Normative references
3 Terms and definitions, symbols and units
4 Principle
5 Apparatus
6 Test specimens
7 Procedure
8 Calculation and expression of results
9 Accuracy of measurement
10 Test report
Annex A (informative) - Air relative humidities above
        saturated solutions in equilibrium
Annex B (informative) - Preparation of saturated
        solutions
Annex C (informative) - Example of the procedure
        for determining a point on a sorption curve
Annex D (informative) - Method using a glass jar
Bibliography

ISO 12571:2013 specifies two alternative methods for determining hygroscopic sorption properties of porous building materials and products:a) using desiccators and weighing cups (desiccator method);b) using a climatic chamber (climatic chamber method).The desiccator method is the reference method.ISO 12571:2013 does not specify the method for sampling.The methods specified in ISO 12571:2013 can be used to determine the moisture content of a sample in equilibrium with air at a specific temperature and humidity.