BS ISO 22958:2021 pdf download – Textiles — Water resistance — Rain tests: exposure to a horizontal water spray
This document specifies a test for measuring the resistance of fabrics to the penetration of water by impact. It can be used to predict the probable rain penetration resistance of textile fabrics.
This document is applicable to any textile fabric, whether or not it has been given a water-resistant or water-repellent finish. It is especially suitable for measuring apparel fabrics. Testing at different intensities of water impact gives a complete picture of the penetration resistance of a single fabric or combination of fabrics. The test is particularly suitable when measuring highly water-resistant fabrics with low amounts of water penetration.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
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characteristic indicating the ability to resist wetting and penetration by water 4 Principle
A test specimen, backed by a weighed blotter, is sprayed with water for 5 min under controlled conditions. The blotter is then reweighed to determine the amount of water which has leaked through the specimen during the test.
5 Safety precautions
Good laboratory practice should be followed. Wear safety glasses in all laboratory areas.
6.2 White textile blotting paper, of approximate thickness 0,7 mm ± 0,1 mm, of approximate surface density (often known in the industry as “weight”) 370 g/m 2 ± 36,0 g/m 2 and with an approximate absorbent capacity of 240 %. 2)
6.3 Water, grade 3 water in accordance with ISO 3696 at (27 ± 1) °C or (20 ± 2) °C.
6.4 Laboratory balance, accurate to 0,1 g.
7 Test specimens
A minimum of three specimens measuring approximately 200 mm × 200 mm are cut from the test fabric. Condition the test specimens and blotting paper for a minimum of 4 h. Conditioning and testing shall be carried out in accordance with ISO 139. If so agreed, conditioning and testing may be carried out in the ambient atmosphere.
8.1 The test specimen, backed by a (150 mm ± 3 mm) × (150 mm ± 3 mm) piece of textile blotting paper weighed to the nearest 0,1 g, is clamped in the specimen holder and the assembly is mounted in a vertical, rigid support frame positioned to locate the specimen in the central portion of the spray at a distance of 305 mm from the face of the spray nozzle.
8.2 A horizontal water spray is directed against the specimen and is allowed to continue for a period of 5 min at the specified pressure head. NOTE Most of the time, a specified pressure head is given when this test is requested. However, as stated in 9.2, different pressure heads can be used to obtain a complete overall picture of the penetration resistance of a fabric. If no pressure head is specified, use 600 mm for initial testing.
8.3 At the end of the spray period, the blotter is carefully removed and quickly reweighed to the nearest 0,1 g.
8.4 The number of test specimens required will be governed largely by the degree of accuracy desired, but in all cases a minimum of three specimens from each fabric or treatment should be tested.BS ISO 22958 pdf download.