Adopts ISO 5636-4:2013, which specifies the Sheffield method for determining the air permeance of paper and board using the Sheffield apparatus. It is applicable to papers and boards which have air permeances between 0.02μm/(Pa.s) and 25μm/(Pa.s) when tested with the Sheffield apparatus. It is unsuitable for rough-surfaced materials, which cannot be securely clamped to avoid leakage.
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1
5.2
5.3
5.4
5.4.1
5.4.2
5.5
5.6
5.7
6 Sampling
7 Conditioning
8 Preparation of test pieces
9 Calibration
9.1 Variable-area flow-measuring device
9.2 Electronic flow-measuring device
10 Procedure
11 Expression of results
11.1 Calculation of air permeance
11.2 Reporting the results
11.3 Standard deviation and coefficient of variation
