This standard specifies a method for determining the surface moisture resistance of various fabrics with or without water-repellent or water-repellent finishes. This standard is not suitable for determining the water permeability of fabrics and cannot be used to predict the rain penetration of fabrics. GB/T 4745-1997 Determination of the surface moisture resistance of textile fabrics by water-spraying test GB/T4745-1997 Standard download decompression password: www.bzxz.net

ICS 59. 080. 30
National Standard of the People's Republic of China
GB/T 4745—1997
eqyISo4920:1981
Textile fabrics
Determination of resistance to surface wettingSpray test
Published on October 9, 1997
Implemented on May 1, 1998
Published by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Determination of resistance to surface wettingSpray test of textile fabrics
Water test
GB/T 4745—1997
Published by China Standards Press
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Format 880×12301/16 Printing Sheet 1/2 Words Thousands of Words First Edition June 1998 First Printing June 1998 Printing Quantity 1—1500|| tt||Book number: 155066-1-14888
Price 6.00 yuan
Standard 338-16
GB/T4745-1997bZxz.net
This standard is a revision of GB4745-84 based on ISO4920:1981I (19811 edition) provided by the Textile Subcommittee of the ISO/TC38 Technical Committee of the International Organization for Standardization and reconfirmed in April 1992. It is equivalent to the international standard in terms of technical content, and its writing format and method are consistent with ISO 4920. According to GB/T1.1-1993 and the notice of January 12, 1995, the cover and title writing format have been modified, and the foreword and ISO foreword have been added.
According to GB/T1.1-1993, the "reference standard" content and introduction have been added to GB4745-84. Due to the addition of a chapter, the subsequent chapter numbers are postponed. Chapter 5 of GB4745-84 is modified. Article e) is also added to Chapter 9: and the ISO grade order in the appendix of ISO4920 is changed to 100-50. The contents of other chapters remain unchanged or the text is slightly changed. This standard replaces GB4745-84 from the beginning of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed by the China Textile General Association.
This standard is under the jurisdiction of the Standardization Research Institute of the China Textile General Association. The drafting unit of this standard is Shaanxi Textile Science Research Institute. The main drafters of this standard are Mei Zhuoran, Feng Lan and Zhang Shenghui. GB/T4745-1997
ISO Foreword
ISO (International Organization for Standardization) is a worldwide joint organization of national standardization associations (ISO member bodies). The formulation of international standards is carried out by ISO technical committees. Each member body has the right to participate in the committee when it is interested in a project of an established technical committee. International organizations, both governmental and non-governmental, that are in contact with ISO may also participate in the work. Draft international standards adopted by technical committees are submitted to member bodies for approval before they are approved as international standards by the ISO Council.
International Standard ISO 4920 was developed by ISO/TC38 Technical Committee on Textiles and sent to member bodies in October 1979. The international standard was reviewed in November 1990, voted on March 23, 1992, and discussed and further confirmed at the 12th Annual Meeting of ISO/TC38/SC2 held in France in April 1992. 1 Scope
National Standard of the People's Republic of China
Textile fabrics-Determination of resistance to surface wettingSpray test
GB/T 4745—1997
eq150 4920:1981
Replaces GB47484
This standard specifies a method for determining the surface moisture resistance of various fabrics that have or have not been treated with water-resistant or water-repellent finishes. This standard is not suitable for determining the water permeability of fabrics and cannot be used to predict the rain penetration resistance of fabrics. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB6529-86 Standard atmosphere for conditioning and testing textiles (neqISO139:1987) 3 Definitions
This standard adopts the following definitions.
Spray rating
Indicates the degree of moisture resistance of the fabric surface.
4 Principle
The sample is mounted on a clamping ring and placed at an angle of 15° to the horizontal, with the center of the sample located a specified distance below the nozzle. Spray the sample with a specified volume of distilled water or deionized water. Determine its spray rating by comparing the appearance of the sample with the evaluation standard and the picture. 5 Instruments
5.1 The spray device (see Figure 1) consists of a vertically clamped 150mm funnel and a metal nozzle. The nozzle (5.2) and the funnel are connected by a 10mm diameter rubber hose. The distance from the funnel-to-nozzle to the bottom of the nozzle is 190mm. Approved by the State Administration of Technical Supervision on October 9, 1997, and implemented on May 1, 1998
Dimensions in the figure are expressed in millimeters
GB/T4745-1997
Glass funnel 50
Support ring
Rubber hose
Water spray nozzle
Specimen support
Hollow bottom (wooden)
Water dipping instrument
5.2 The metal nozzle (see Figure 2) has a convex circular surface with 19 holes of $0.9 mm uniformly distributed on it. After 250 mL of water is injected into the funnel, the continuous spraying time should be between 80:.
The scale in the figure is in millimeters
Figure 2 Nozzle
There are 12 holes of 0.9 uniformly distributed on the circumference of 421.4
There are 6 holes of 40.9 uniformly distributed on the circumference of 0
There is 1 hole of 0.9 in the center
5.3 The sample holder consists of two wooden or metal rings that can cooperate with each other. The outer diameter of the inner ring is 150mmll (like an embroidery frame), and the sample can be tightly clamped in it. During the test, the clamp ring should be placed on a suitable support so that it is inclined at 45 degrees. The center of the test surface is 150mm below the center of the nozzle surface. Note:
17ISO4920:1981 Clause 5.3 has an inner diameter of 150mm\Deleted because it is not suitable for thick fabrics. 2

GB/T 4745-—1997
5.4 Steamed stuffing water or deionized water, the temperature is 20C±2℃ or 27℃±2℃. 6 Humidity conditioning and test temperature and humidity
6.1 Humidity conditioning and test temperature and humidity shall be carried out in accordance with GB6529 in domestic and foreign trade, commodity inspection, brand product evaluation, arbitration and new product assessment.
6.2 Routine inspection or other agreements may be carried out at room temperature or under actual conditions. 7 Samples
Touch as little as possible after sampling. Take at least three 180mm square samples from different parts of the fabric to make the samples as representative as possible. Do not take samples from areas with wrinkles or creases. 8 Test steps
8.1 The sample shall be conditioned for at least 24 hours in the atmospheric conditions specified in Chapter 6. 8.2 After conditioning, clamp the sample with the sample holder 5.3) and place it on the support. The fabric shall face up during the test. Unless otherwise required, the specimen shall be parallel to the direction of water flow.
Quickly and steadily pour 250ml of water (5.4) into the funnel (5.1) so that the watering continues. Once the watering stops, quickly remove the holder together with the specimen so that the fabric is almost horizontal with the front side facing down. Then gently tap it twice against a hard object (once at two opposite points on the radial direction of the stretcher). After the tapping, the specimen is still in the holder. According to the observed degree of wetness of the specimen, use the level closest to the following text description and picture representation to assess its grade. Do not assess the intermediate grade. Note: For dark fabrics.The picture standard is not very satisfactory, and the rating is mainly based on the text description. Water level:
Level 1 - The entire surface of the shower is wetted.
Level 2 - Half of the shower surface is wetted, which refers to the sum of the wetted areas of small unconnected patches. - The shower surface is only wetted by small unconnected areas. Level 3 -
Level 4 - The shower surface is not wetted, but there are small water droplets on the surface. 5
- The shower surface is not wetted, and there are no small water droplets on the surface. 9 Test report
This test report should include the following:
a) Explanation that the test is carried out in accordance with this standard; b) The atmospheric conditions used (standard temperate zone, or standard tropical zone, or other atmospheric conditions); c) Water temperature (20℃ or 27℃, or other temperature), d) The water level of each sample tested, e) The test date.
Instructions for use:
1] Touching the sample with your hands will affect the test results, which is not specified in Chapter 7 of IS4920:1981. Therefore, it is added that "after sampling, try to touch the sample as little as possible". The corresponding ISO grades of this standard are as follows1, GB 5-ISO 5=AATCC 100
GB 4=ISO 4-AATCC 90
GB 3=ISO 3=AATCC 80
GB 2=ISO 2=AATCC 70
GB 1-ISO 1-AATCC 50
ISO 5(100)
ISO) 2(70)
GB/T4745—1997
Appendix A
(Appendix to the standard)
Picture grade
ISO 4(90)
1S0 1(50)
IS0 3(80)
ISO 5—The upper surface is wet or moist; ISO 4°..—The upper surface has a small amount of irregular water or moist; ISO 3—The upper surface is wet at the exposed part; ISO 2—The entire upper surface is partially moist, ISO 1—The entire upper surface is completely wet Figure A1 ISO water test grade chart based on AATCC picture grade Adoption instructions:
1] Here, the ISO grade sequence is changed to 1S0 5 ~ ISO 1, which is consistent with the text of the surrounding film grade. 27 This is inconsistent with the 4th grade in 8.2 of ISO 4920,1981, and should be based on 8.2 of this standard. Article 1. Copyright reserved. No reproduction allowed.
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