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GB/T 18886-2019 English PDF

GB/T 18886-2019 (GB/T18886-2019, GBT 18886-2019, GBT18886-2019)
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Standards related to: GB/T 18886-2019

BASIC DATA
Standard ID GB/T 18886-2019 (GB/T18886-2019)
Description (Translated English) Textiles -- Tests for colour fastness -- Colour fastness to saliva
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard W04
Classification of International Standard 59.080.01
Word Count Estimation 6,636
Date of Issue 2019-06-04
Date of Implementation 2020-01-01
Drafting Organization China Textile Standard Inspection and Certification Co., Ltd., Shenzhen Beilishuang Industrial Co., Ltd., Haosha Industrial (Fujian) Co., Ltd., Lufeng Weaving and Dyeing Co., Ltd., China National Accreditation Center for Conformity Assessment
Administrative Organization National Textile Standardization Technical Committee (SAC/TC 209)
Proposing organization China National Textile and Apparel Council
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 18886-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.01 W 04 Replacing GB/T 18886-2002 Textiles - Tests for colour fastness - Colour fastness to saliva ISSUED ON: JUNE 04, 2019 IMPLEMENTED ON: JANUARY 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the PRC. Table of Contents Foreword ... 3  1 Scope ... 5  2 Normative references ... 5  3 Principle ... 6  4 Equipment and materials ... 6  5 Samples ... 8  6 Operating procedures ... 9  7 Test report ... 10  Textiles - Tests for colour fastness - Colour fastness to saliva 1 Scope This Standard specifies the test method for the determination of the colour fastness to saliva of textiles. This Standard applies to all kinds of textiles. 2 Normative references The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing change in colour GB/T 251 Textiles - Tests for colour fastness - Grey scale for assessing staining GB/T 6151 Textiles - Tests for colour fastness - General principle of testing GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 7568.1 Textiles - Tests for colour fastness - Specification for wool adjacent fabric GB/T 7568.2 Textiles - Tests for colour fastness - Standard adjacent fabrics - Part 2: Cotton and viscose GB/T 7568.3 Textiles - Tests for colour fastness - Standard adjacent fabrics - Part 3: Polyamide GB/T 7568.4 Textiles - Tests for colour fastness - Specification for polyester adjacent fabric GB/T 7568.5 Textiles - Tests for colour fastness - Specification for acrylic adjacent fabric Other devices which can achieve the same result can be used. 4.2 Thermostat KEEP the temperature at (37±2) °C. 4.3 Artificial saliva 4.3.1 Formula composition The reagents used are chemically pure. USE Grade 3 water (4.12) to prepare the test solution. Prepared when used. Each liter of test solution contains: Magnesium chloride hexahydrate (MgCl2 • 6H2O) 0.17 g Calcium chloride dihydrate (CaCl2 • 2H2O) 0.15 g Dipotassium hydrogen phosphate trihydrate (K2HPO4 • 3H2O) 0.76 g Potassium carbonate (K2CO3) 0.53 g Sodium chloride (NaCl) 0.33 g Potassium chloride (KCl) 0.75 g USE hydrochloric acid solution with a mass fraction of 1% to adjust the pH of the test solution to 6.8±0.1. 4.3.2 Preparation method DISSOLVE the prescribed amount of sylvite and sodium salts in 900 mL of Grade 3 water (4.12); ADD magnesium chloride and calcium chloride and stir until they are completely dissolved. Immerse the calibrated pH meter (4.11) electrode in the solution; ADD slowly 1% hydrochloric acid solution; STIR gently to make the solution pH reach 6.8±0.1. ADD Grade 3 water (4.12) to dilute to 1000 mL; SHAKE well and store in the dark. 4.4 Adjacent fabric (See GB/T 6151) Choose any one of 4.4.1 and 4.4.2. 4.4.1 A multifibre adjacent fabric shall conform to GB/T 7568.7. 4.4.2 Two single-fibre adjacent fabrics shall conform to GB/T 7568.1~7568.6, GB/T 7568.8, GB/T 13765. a) TAKE a piece of sample of (100±2)mm×(40±2)mm; CONTACT the front to a piece of (100±2)mm×(40±2)mm multifibre adjacent fabric (4.4.1). Sew along a short side to form a combined sample. b) TAKE a piece of sample of (100±2)mm×(40±2)mm and sandwich it between two (100±2)mm×(40±2)mm single-fibre adjacent fabrics (4.4.2). Sew along a short side to form a combined sample. 5.2 For yarn or loose-fibre samples, the mass of yarn or loose fibre taken is approximately equal to half the total mass of the adjacent fabric. According to one of the following methods, prepare a combined sample: a) SANDWICH it between a piece of (100±2)mm×(40±2)mm multifibre adjacent fabric and a piece of (100±2)mm×(40±2)mm non-dyeable fabric (4.4.3). Sew along the four sides (See GB/T 6151) to form a combined sample. b) SANDWICH it between two prescribed (100±2)mm×(40±2)mm single-fibre adjacent fabrics. Sew along the four sides to form a combined sample. 6 Operating procedures 6.1 At room temperature, the combined sample is placed flat in a flat-bottomed container (4.10). Inject artificial saliva (4.3) to completely wet it at a bath ratio of 50:1. PLACE it at room temperature for 30 min. From time to time, PRESS down and stir, to ensure that the test solution can penetrate fully and evenly. TAKE the sample out; POUR off residual solution; USE a suitable method (such as two glass rods) to clip the excess test solution off the combined sample. The combined sample is placed flat between two glass or acrylic acid resin plates (4.9) and placed in test devices (4.1) to be pressurized (12.5±0.9)kPa. Note: A maximum of 10 combined samples can be placed simultaneously for each test device. Each sample is separated by a plate (11 pieces in total). If less than 10 samples, 11 plates are still used, to keep the pressure constant. 6.2 PLACE the test devices (4.1) with the combined sample in the thermostat (4.2); HOLD at (37±2)°C for 4 h; PLACE the test devices (4.1) horizontal (Figure 1) or vertical (Figure 2). ...