ISO 4920-2012 pdf free download.Textile fabrics – Determination of resistance to surface wetting (spray test). ISO 4920 specifies a spray test method for determining the resistance of any fabric, which might or might not have been given a water-resistant or water-repellent finish, to surface wetting by water. It is not intended for use in predicting the rain-penetration resistance of fabrics, since it does not measure penetration of water through the fabric. 2 Normative references The following referenced documents are indispensable for the application 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 arid testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. spray rating measure of the resistance of the surface of a fabric to wetting 3.2 face fabric surface that is intended to be the outer visible side in an end product 4 Principle A specified volume of distilled or fully deionized water is sprayed on a test specimen that has been mounted on a ring and placed at an angle of 45 so that the centre…