ISO 9237 pdf download

ISO 9237 pdf download.Textiles一Determination of the permeability of fabrics to air 1 Scope This International Standard describes a method for measuring the permeability of fabrics to air and is ap- plicable to most types of fabrics, including industrial fabrics for technical purposes, nonwovens and made-up textile articles that are permeable to air. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards. ISO 48:1994, Rubber, vulcanized or thermoplastic – Determination of hardness (hardness between 10 IRHD and 100 IRHD). ISO 139:1973, Textiles – – Standard atmospheres for conditioning and testing. ISO 10012-1:1992， Quality assurance requirements for measuring equipment – Part 1: Metrological confirmation system for measuring equipment. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 air permeability: Velocity of an air flow passing perpendicularly through a test specimen under speci- fied conditions of test area, pressure drop and time. 4 Principle The rate of flow of air passing perpendicularly through a given area of fabric is measured at a given pressure difference across the fabric test area over a given time period. 5 Sampling Select samples either in accordance with the pro- cedure laid down in the material specification for the fabric, or as agreed between the interested parties. In the absence of specification, follow the example of sampling given in annex B. 6 Atmospheres for conditioning and testing The atmospheres for preconditioning， conditioning and testing shall be as specified in ISO 139. 7 Apparatus Metrological confirmation of the test apparatus shall be carried out in accordance with ISO 10012-1. 7.1 Circular specimen holder, with an orifice al- lowing the test to be carried out on an area of 5 cm*, 20 cm’. 50 cm2 or 100 cm2. The tolerance on the test area shall not exceed 士0,5 %. NOTE 1 Adequate support of the test specimen, particu- larly for large test surfaces, is recommended. 7.2 Means for clamping, to secure the specimen without distortion. NOTE 2Care should be taken to prevent leakage of air around the...