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BSI
BS 7406:1991

BS 7406:1991

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Methods for determination of water vapour transmission rate of sheet materials (paper and board) by dynamic sweep and static gas methods

Available format(s)

Hardcopy , PDF

Superseded date

03-03-2021

Language(s)

English

Published date

31-01-1991

Publisher

British Standards Institution

Committees responsible
National foreword
Method
1. Scope
2. Normative references
3. Definitions
4. Method A: Dynamic sweep gas method
5. Method B: Static gas method
6. Sampling
7. Preparation of test pieces
8. Procedure
9. Expression of results
10. Precision
11. Test report
Annexes
A. Saturated saline solutions
B. Calibration
C. Comparison of dynamic method with gravimetric
     method
Figures
1. Schematic diagram of dynamic system
2. Schematic diagram of static system
C.1 Dynamic method compared with gravimetric method

Can measure WVTR\'s as low as 0.05 g/(m2.d) and be used on materials up to 38 mm thick.

This International Standard describes general test methods for determining the water vapour transmission rate of sheet materials by means of a dynamic gas method or a static gas method. Depending on the method and specific apparatus employed, materials up to 38mm thick and with water vapour transmission rates in the range 0,05g/(m2 · d) to 65g/(m2 · d) can be tested. The basis of the function of the instrumental techniques is briefly described. Advice on calibration is given in AnnexB.

Committee
PAI/11
DevelopmentNote
Also numbered as ISO 9932 Supersedes 89/39832 DC (10/2005) Reviewed and confirmed by BSI, November 2013. (10/2013)
DocumentType
Standard
Pages
14
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

DEFSTAN 81-147/1(2017) : 2017 WATER-VAPOUR RESISTANT MATERIAL AND BAGS FOR PACKAGING
DEFSTAN 81-75/3(2005) : 2005 BARRIER MATERIAL, ALUMINIUM FOIL LAMINATE, FLEXIBLE, HEAT SEALABLE, WATER-VAPOUR RESISTANT
DEFSTAN 93-116/1(2000) : 2000 POLYETHYLENE (LOW DENSITY) FILM FOR PACKAGING TYPES 1, 2 AND 3
DEFSTAN 81-75/2(1997) : 1997 BARRIER MATERIAL, ALUMINIUM FOIL LAMINATE, FLEXIBLE, HEAT SEALABLE, WATER-VAPOUR RESISTANT
BS 2782-8:Method 820A:1996 Methods of testing plastics. Other properties Determination of water vapour transmission rate (dish method)

BS 3177:1959 Method for determining the permeability to water vapour of flexible sheet materials used for packaging

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Hardcopy - English
PDF - English
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