GB/T 18886-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18886-2019 | English | 85 |
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Textiles - Tests for colour fastness - Colour fastness to saliva
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| GB/T 18886-2002 | English | 70 |
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Textiles -- Tests for fastness -- Colour fastness to saliva
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GB/T 18886-2019: Textiles - Tests for colour fastness - Colour fastness to saliva---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18886-2019
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
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 18886-2002 “Textiles - Tests for fastness - Colour
fastness to saliva”. As compared with GB/T 18886-2002, the main changes are
as follows.
- In “Normative references”, refer to GB/T 7568.1~7568.8 instead of the
abolished GB 7564 ~ GB 7568 and GB 11404; ADD GB/T 6151, GB/T 6682,
GB/T 13765, GB/T 32598, and GB/T 32616 (See Clause 2; Clause 2 of the
2002 edition).
- ADD the tolerance of intensity of pressure for the test devices (See 4.1).
- INCORPORATE “test solution preparation” into “Equipment and materials”;
modify the formula composition of artificial saliva; ADD the control index
and preparation method of artificial saliva pH (See Clause 4; Clause 7 of
the 2002 edition).
- In requirements for adjacent fabrics, ADD a note, that is. Other types of
fibres may be used with reference to similar or alike fibres (See 4.4.2).
- ADD some equipment and materials (See 4.7~4.11).
- In “Operating procedures”, ADD a note, that is. 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 (See 6.1).
- ADD placement method of the combined sample (See 6.2).
- ADD an optional method of instrumental assessment of change in colour of
the sample and staining of the adjacent fabric (See 6.4).
- In “Test report”, ADD items a), b), d), e), f), and g); ADD the instrument
assessment result and the indication of assessment method to item c) (See
Clause 7).
This Standard was proposed by China National Textile and Apparel Council.
This Standard shall be under the jurisdiction of National Technical Committee
209 on Textiles of Standardization Administration of China (SAC/TC 209).
Drafting organizations of this Standard. China Textile Testing & Certification
Services, Shenzhen Baliso Industrial Co., Ltd., Hosa Industry (Fujian) Co., Ltd.,
Lufeng Weaving & Dyeing Co., Ltd., China National Accreditation Service for
Conformity Assessment.
Main drafters of this Standard. Yang Xiaoxiao, Li Zhien, Fu Wei, Li Chun, Zhang
Zhanqi, Xu Qiusheng, Huang Bixian, Chang Xiangzhen.
The previous editions of the standard replaced by this Standard were released
as follows.
- GB/T 18886-2002.
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
GB/T 7568.6 Textiles - Tests for colour fastness - Specification for silk
adjacent fabric
GB/T 7568.7 Textiles - Tests for colour fastness - Standard adjacent fabrics
- Part 7.Multifibre
GB/T 7568.8 Textiles - Tests for colour fastness - Standard adjacent fabric -
Part 8.Secondary acetate
GB/T 13765 Textiles - Tests for colour fastness - Specification for
STANDARD adjacent fabric of linen and ramie
GB/T 32598 Textile - Tests for colour fastness - Method for the instrumental
assessment of staining of adjacent fabrics
GB/T 32616 Textiles - Tests for colour fastness - Instrumental assessment of
change in color for determination of grey scale rating
3 Principle
Attach the sample to the prescribed adjacent fabric. After being treated in
artificial saliva, REMOVE the excess test solution; PLACE between two flat
plates in the test device and apply a prescribed intensity of pressure; KEEP
under a prescribed condition for a certain period of time. Then, DRY the sample
and the adjacent fabric respectively; USE a grey scale or an instrument to
assess the change in colour of the sample and the staining of the adjacent fabric.
4 Equipment and materials
4.1 Test devices
Each set of test devices consist of a stainless-steel frame and a heavy hammer
of about 5 kg in mass and 115 mm×60 mm in bottom area; and a glass plate or
acrylic acid resin plate of about 115 mm×60 mm×1.5 mm in size. When the
combined sample of (100±2)mm×(40±2)mm is sandwiched between the plates,
the combined sample may be subjected to an intensity of pressure of
(12.5±0.9)kPa. The structure of the test devices shall be such that the intensity
of pressure applied to the sample remains unchanged after the heavy hammer
is removed during the test.
If the size of the combined sample is not (100±2)mm×(40±2)mm, the nominal
intensity of pressure applied to the sample by the heavy hammer used shall be
(12.5±0.9)kPa.
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.
4.5 Grey scale for assessing change in colour shall conform to the provisions
of GB/T 250.
4.6 Grey scale for assessing staining shall conform to the provisions of GB/T
251.
4.7 The colorimeter or colour difference meter for assessing change in colour
and staining shall comply with the provisions of GB/T 32616 and GB/T 32598.
4.8 Balance. The division value is 0.01 g.
4.9 A set of 11 glass or acrylic acid resin plates.
4.10 Corrosion-resistant flat-bottomed container.
4.11 pH meter. The measurement accuracy is at least accurate to 0.1.
5 Samples
5.1 For fabric samples, according to one of the following methods, prepare a
sample.
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.
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).
7 Test report
The test report shall include the following.
a) This Standard’s number;
b) Sample description;
c) Assess the level of change in colour of the sample and indicate the
assessment method (eye method or instrument method);
d) For single-fibre adjacent fabrics, assess the staining level and indicate the
assessment method (eye method or instrument method);
e) For multifibre adjacent fabric, assess the staining level of each fibre;
indicate the type of multifibre adjacent fabric used and the assessment
method (eye method or instrument method);
f) The state of placement of the sample in the thermostat (horizontal or
vertical);
g) Any deviation from the details of this Standard.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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