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GB/T 18886-2019 (GBT 18886-2019)

GB/T 18886-2019_English: PDF (GBT18886-2019)
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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).