BS 7406:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Methods for determination of water vapour transmission rate of sheet materials (paper and board) by dynamic sweep and static gas methods
Hardcopy , PDF
03-03-2021
English
31-01-1991
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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.
| 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Superseded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 |
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.
| 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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