ISO 12572:2016
Hygrothermal performance of building materials and products — Determination of water vapour transmission properties — Cup method
ISO 12572:2016 specifies a method based on cup tests for determining the water vapour permeance of building products and the water vapour permeability of building materials under isothermal conditions. Different sets of test conditions are specified.
The general principles are applicable to all hygroscopic and non-hygroscopic building materials and products, including insulation materials and including those with facings and integral skins. Annexes give details of test methods suitable for different material types.
The results obtained by this method are suitable for design purposes, production control and for inclusion in product specifications.
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Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions
3.2 Symbols and units
3.3 Subscripts
4 Principle
5 Apparatus
6 Test specimens
6.1 General principles for preparation of test specimens
6.2 Dimensions of test specimens
6.2.1 Shape and fit
6.2.2 Exposed area
6.2.3 Thickness of test specimens
6.3 Number of test specimens
6.4 Conditioning of test specimens
6.5 Testing low resistance specimens
7 Procedure
7.1 Test conditions
7.2 Preparation of specimen and test assembly
7.3 Test procedure
8 Calculation and expression of results
8.1 Mass change rate
8.2 Density of water vapour flow rate
8.3 Water vapour permeance
8.4 Water vapour resistance
8.5 Water vapour permeability
8.6 Water vapour resistance factor
8.7 Water vapour diffusion-equivalent air layer thickness
9 Accuracy of measurement
9.1 General
9.2 Specimen area
9.3 Specimen thickness
9.4 Sealants
9.5 Weighing precision
9.6 Control of environmental conditions
9.7 Variations in barometric pressure during test
10 Test report
Annex A (normative) Methods suitable for self-supporting materials
Annex B (normative) Methods suitable for loose fills
Annex C (normative) Methods suitable for membranes and foils
Annex D (normative) Methods suitable for mastics and sealants
Annex E (normative) Methods suitable for paint, varnishes, etc.
Annex F (normative) Correction for the effect of a masked edge of a specimen
Annex G (normative) Correction for resistance of air layers
Annex H (normative) Method for calculating the water vapour resistance of the air layer in the cup
Annex I (informative) Weighing repeatability, weighing interval and specimen size needed to achieve desired accuracy
Annex J (informative) Conversion table for water vapour transmission units
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions
3.2 Symbols and units
3.3 Subscripts
4 Principle
5 Apparatus
6 Test specimens
6.1 General principles for preparation of test specimens
6.2 Dimensions of test specimens
6.2.1 Shape and fit
6.2.2 Exposed area
6.2.3 Thickness of test specimens
6.3 Number of test specimens
6.4 Conditioning of test specimens
6.5 Testing low resistance specimens
7 Procedure
7.1 Test conditions
7.2 Preparation of specimen and test assembly
7.3 Test procedure
8 Calculation and expression of results
8.1 Mass change rate
8.2 Density of water vapour flow rate
8.3 Water vapour permeance
8.4 Water vapour resistance
8.5 Water vapour permeability
8.6 Water vapour resistance factor
8.7 Water vapour diffusion-equivalent air layer thickness
9 Accuracy of measurement
9.1 General
9.2 Specimen area
9.3 Specimen thickness
9.4 Sealants
9.5 Weighing precision
9.6 Control of environmental conditions
9.7 Variations in barometric pressure during test
10 Test report
Annex A (normative) Methods suitable for self-supporting materials
Annex B (normative) Methods suitable for loose fills
Annex C (normative) Methods suitable for membranes and foils
Annex D (normative) Methods suitable for mastics and sealants
Annex E (normative) Methods suitable for paint, varnishes, etc.
Annex F (normative) Correction for the effect of a masked edge of a specimen
Annex G (normative) Correction for resistance of air layers
Annex H (normative) Method for calculating the water vapour resistance of the air layer in the cup
Annex I (informative) Weighing repeatability, weighing interval and specimen size needed to achieve desired accuracy
Annex J (informative) Conversion table for water vapour transmission units
Bibliography