ISO 2528:2017
Sheet materials — Determination of water vapour transmission rate (WVTR) — Gravimetric (dish) method
ISO 2528:2017 specifies a method for the determination of the water vapour transmission rate (often erroneously called "permeability") of sheet materials.
This method is not generally recommended for use if the transmission rate is expected to be less than 1 g/m2 per day or for materials thicker than 3 mm. In such cases the method specified in ISO 9932 is preferred.
The method cannot be applied to film materials that are damaged by hot wax or that shrink to an appreciable extent under the test conditions used.
For some purposes it may be necessary to determine the transmission rate of creased material; a procedure for this is given in Annex A.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and material
6 Sampling
7 Conditioning
8 Preparation of test pieces
9 Preparation of dishes
9.1 General
9.2 Use of wax and a cover template [5.3 b)]
9.3 Use of wax and a ring template [5.3 a)]
10 Procedure
10.1 General method
10.2 Use of blank assemblies
10.3 Creased sheet
11 Expression of results
12 Precision
13 Test report
Annex A (normative) Method for determination of water vapour transmission rate of creased materials
Annex B (normative) Test conditions
Annex C (informative) Sealing waxes
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and material
6 Sampling
7 Conditioning
8 Preparation of test pieces
9 Preparation of dishes
9.1 General
9.2 Use of wax and a cover template [5.3 b)]
9.3 Use of wax and a ring template [5.3 a)]
10 Procedure
10.1 General method
10.2 Use of blank assemblies
10.3 Creased sheet
11 Expression of results
12 Precision
13 Test report
Annex A (normative) Method for determination of water vapour transmission rate of creased materials
Annex B (normative) Test conditions
Annex C (informative) Sealing waxes
Bibliography