GB/T 40264-2021 English PDF (GBT40264-2021)

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GB/T 40264-2021: Textiles - Tests for colour fastness - Colour fastness to urine
GB/T 40264-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles - Tests for color fastness - Color fastness to
urine
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Principles ... 5 
5 Equipment and materials ... 5 
6 Specimens ... 8 
7 Operating procedures ... 8 
8 Test report ... 9 
Textiles - Tests for color fastness - Color fastness to
urine
1 Scope
This document specifies the test methods, for determining the color fastness to
urine of various textile products.
This document applies to all types of textile products.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 250 Textiles - Tests for color fastness - Grey scale for assessing
change in color
GB/T 251 Textiles - Tests for color fastness - Grey scale for assessing
staining
GB/T 6151 Textiles-Tests for color fastness - General principle of testing
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 7568.1 Textiles - Tests for color fastness - Specification for wool
adjacent fabric
GB/T 7568.2 Textiles - Tests for color fastness - Standard adjacent fabrics -
Part 2: Cotton and viscose
GB/T 7568.3 Textiles - Tests for color fastness - Standard adjacent fabrics -
Part 3: Polyamide
GB/T 7568.4 Textiles - Tests for color fastness - Specification for polyester
adjacent fabric
GB/T 7568.5 Textiles - Tests for color fastness - Specification for acrylic
structure of the test device shall ensure that, the pressure on the specimen
remains unchanged, after the weight is removed during the test.
If the size of the combined sample is not (40 ± 2) mm × (100 ± 2) mm, the
nominal pressure, which is applied by the weight to the specimen, shall be (12.5
± 0.9) kPa.
It may use other devices, that can achieve the same result.
5.2 Thermostat
Keep the temperature at (37 ± 2) °C.
5.3 Artificial urine
The reagents used are chemically pure. The test solution is prepared by the
grade 3 water, in accordance with GB/T 6682. It is prepared before use.
Each liter of test solution contains:
Urea (NH2CONH2): 26.50 g
Sodium chloride (NaCl): 8.30 g
Potassium dihydrogen phosphate (KH2PO4): 2.50 g
Disodium hydrogen phosphate dodecahydrate (Na2HPO4 ·12H2O): 1.80 g
Calcium acetate monohydrate [Ca(CH3COO)2·H2O)]: 0.07 g
Magnesium sulfate heptahydrate (MgSO4·7H2O): 0.05 g
5.4 Adhesive fabric
5.4.1 It shall meet the requirements of GB/T 6151; choose one from a) and b).
a) A piece of multi-fiber lining, which meets the requirements of GB/T 7568.7.
b) Two single-fiber lining fabrics, which shall meet the requirements of GB/T
7568.1 ~ 7568.6, GB/T 7568.8, GB/T 13765. The first piece is made of the
same fibers as the specimen, whilst the second piece is made of the fibers
specified in Table 1. If the specimen is a two-component or more than two-
component fabric, the first piece is made of fibers with a major content;
the second piece is made with fibers with a minor content. OR it is
specified otherwise.
Note: Other types of fibers can be used with reference to the same or similar fibers.
6 Specimens
6.1 For fabric samples, prepare a combined specimen, according to one of the
following methods:
a) Take a specimen of (40 ± 2) mm × (100 ± 2) mm. Make its front side in
contact with a piece of (40 ± 2) mm × (100 ± 2) mm multi-fiber lining fabric
(5.4.1). Stitch along one short side together, to form a combined specimen;
b) Take a specimen of (40 ± 2) mm × (100 ± 2) mm. Sandwich it between two
(40 ± 2) mm × (100 ± 2) mm single-fiber lining fabrics (5.4.1). Make the
front side face the first fiber lining. Stitch along a short side. When testing
the printed fabric, the front side is in contact with half of each piece of the
two lining fabrics. Cut off the other half. Cross-cover them on the back
side. Stitch the two short sides together. If one specimen cannot contain
all colors, it needs taking multiple combined specimens, to contain all
colors.
6.2 For yarn or loose fiber samples, take the yarn or loose fiber, which has a
mass approximately equal to half of the total mass of the lining fabric. Prepare
a combined specimen, according to one of the following methods:
a) Clamp it in between one piece of (40 ± 2) mm × (100 ± 2) mm multi-fiber
lining fabric (5.4.1) and one piece of (40 ± 2) mm × (100 ± 2) mm non-
dyed fabric (5.4.2). Stitch along the four sides (see GB/T 6151), to form a
combined specimen;
b) Clamp it in between two (40 ± 2) mm × (100 ± 2) mm specified single-fiber
lining fabrics (5.4.1). Stitch along the four sides, to form a combined
specimen.
7 Operating procedures
7.1 At room temperature, place a combined specimen flat in a flat-bottomed
container (5.10). Inject the artificial urine test solution (5.3), to make it
completely wet, at a bath ratio of about 50:1. Place it at room temperature for
30 min. Press and toggle from time to time, to ensure that the test solution can
fully and evenly penetrate into the specimen. Take out the specimen. Pour out
the remaining liquid. Use a suitable method (such as two glass rods) to remove
the excess test liquid from the combined specimen.
Place the combined specimen flat, in between two glass or acrylic resin plates
(5.9). Then put it into the test device (5.1), that has been preheated to the test
temperature, to make it withstand a nominal pressure of (12.5 ± 0.9) kPa.