GB/T 5453-2025 Textiles - Determination of the permeability of fabrics to air
1 Scope
This document describes a method for measuring the permeability of fabrics to air.
This document is applicable to a variety of textile fabrics and products, including apparel fabrics, domestic fabrics and industrial fabrics.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing (GB/T 6529-2008, ISO 139:2005, MOD)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for textile testing (ISO 6330:2012, MOD)
3 Terms and definitions
For the purposes of this document, the following term and definition apply.
3.1
air permeability
velocity of an air flow passing perpendicularly through a test specimen under specified conditions of test area, pressure drop and time
4 Principle
The flowrate of air passing perpendicularly through a given area of fabric is measured at a given pressure drop across the fabric test area over a given time period.
5 Specimen preparation
5.1 Sampling
Either select samples in accordance with those specified in the product specification, or as agreed between the interested parties. Representative parts shall be selected for testing, and there shall be no creases, wrinkles, holes, dirt or other abnormalities in the sampling parts, and the distance from the selvage edge shall be more than 150 mm.
In the absence of specification, follow the example of sampling given in Annex A.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Specimen preparation 6 Standard atmospheres for conditioning and testing 7 Apparatus 8 Test conditions 9 Test procedure 10 Calculation and expression of results 11 Test report Annex A (Informative) Sampling Bibliography
