GB/T 42942-2023 PDF English
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Textile trim materials in the interior of automobiles - Test method for Schopper abrasion
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GB/T 42942-2023: PDF in English (GBT 42942-2023) GB/T 42942-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
CCS W 04
Textile Trim Materials in the Interior of Automobiles - Test Method
for Schopper Abrasion
ISSUED ON: AUGUST 6, 2023
IMPLEMENTED ON: MARCH 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Principle ... 5
5 Instruments and Materials ... 5
6 Test Conditions ... 8
7 Specimen Preparation ... 8
8 Test Steps ... 9
9 Result Assessment ... 10
10 Test Report ... 10
Textile Trim Materials in the Interior of Automobiles - Test
Method for Schopper Abrasion
1 Scope
This document describes the test method of adopting the mode of Schopper rotational abrasion
for the determination of the abrasion resistance of textile trim materials used in the interior of
automobiles.
This document is applicable to the testing of the abrasion resistance of textile trim materials
mainly made of textile fiber raw materials and used for the seats and door panel decorations of
automobiles.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in this text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 250 Textiles - Tests for Color Fastness - Grey Scale for Assessing Change in Color
GB/T 3820 Determination of Thickness of Textiles and Textile Products
GB/T 6259 Standard Atmospheres for Textiles Conditioning and Testing
GB/T 21196.1-2007 Textiles - Determination of the Abrasion Resistance of Fabrics by the
Martindale Method - Part 1: Martindale Abrasion Testing Apparatus
FZ/T 01047 Standard Light Sources and Conditions for Visual Assessment of Textile Color
Fastness
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 fuzzing
Fuzzing refers to the phenomenon that the fabric is subject to external friction during use,
causing the fibers on the surface of the fabric to protrude or the fiber ends to protrude to form
fuzz.
3.2 pilling
Pilling refers to the phenomenon that the fluff on the surface of the fabric cannot fall off in time
during use and becomes entangled with each other to form pills.
3.3 whiten
Whiten refers to the phenomenon that the surface color of a fabric turns white after wear and
tear.
4 Principle
Under specified atmospheric environmental conditions, apply a specified load to the specimen;
after adopting the mode of Schopper rotational abrasion to rub the specimen against the abrasive
for a specified number of turns, the specimen may show phenomena of fuzzing, pilling and
whiten, etc. Thus, determine the mass loss, abrasion surface appearance and discoloration grade
of the specimen.
5 Instruments and Materials
5.1 Schopper Abrasion Tester
The Schopper abrasion tester consists of a pressurizing device and a specimen fixture. Th
abrasive can be firmly fixed on the lower end of the pressurizing device and rub against the
specimen fixed on the upper end of the specimen fixture under a certain pressure; the schematic
diagram is shown in Figure 1. The specimen fixture consists of a chunk, a clamping device and
a specimen locking ring; the schematic diagrams are shown in Figure 1 and Figure 2. The chuck
is a cylinder with a tapered surface at one end, with a diameter of 85 mm 1 mm and a cone
angle of 166; the distance (L) between the chuck vertex and the normal rotation axis is 3 mm,
and the angle between the chuck axis and the normal rotation axis is 7. The rotation speed of
the specimen fixture is 75 r/min 1 r/min, and the rotation direction can be changed clockwise
or counterclockwise.
1---chuck;
2---specimen locking ring;
3---clamping device.
Figure 2 -- Schematic Diagram of Clamping Device
5.2 Measuring Gauge
It can measure the height difference (specimen arch height) between the specimen vertex and
the specimen clamping surface after the specimen is installed on the chuck, with an accuracy
of 1 mm.
5.3 Electronic Balance
The accuracy is 0.1 mg.
5.4 Abrasive
Silicon carbide waterproof sandpaper, model P400, with a size of at least 20 cm 9.5 cm, and
completely covering the entire friction surface. Alternatively, abrasives agreed upon by both
sides may also be used.
5.5 Polyurethane Foam Lining
Comply with the requirements of 6.3 in GB/T 21196.1-2007. If the test requires the use of a
polyurethane foam lining, then, use a new polyurethane foam lining each time.
5.6 Rating Box
Use white fluorescent tubes for illumination to ensure uniform illumination over the entire
width of the specimen, and it shall be ensured that the observer does not look directly into the
light. The position of the light source and the plane of the specimen shall be maintained at 5 ~
15, and the observation direction and the plane of the specimen shall be maintained at 90
10 (see Figure 3). The distance between eyes with normal corrected vision and the specimen
shall be 30 cm ~ 50 cm.
9 Result Assessment
9.1 Mass Loss
Calculate the mass difference of the specimen before and after the test, and take the average
value of three sets of data as the test result, accurate to 0.001 g.
9.2 Abrasion Surface Appearance
Use a magnifying device to check the appearance of the abrasion surface of the specimen
surface to see whether there are phenomena like yarn breakage, pilling, fuzzing and whiten, and
record the condition of the abrasion surface.
9.3 Discoloration Grade
The rating box shall be placed in a darkroom. Along the longitudinal direction of the fabric,
place tested specimens and an untested specimen side by side in the middle of the specimen
board of the rating box. Place the tested specimens on the left and the untested specimen on the
right. Use a grey scale of discoloration that complies with the stipulations of GB/T 250 to rate
and record the abrasion surface of each specimen surface. In order to prevent direct light
exposure, at the edge of the rating box, observe each specimen directly from the front of the
specimens.
At least two persons shall rate the specimens. The rating result of a single person is the average
value of the ratings of all specimens; the test result of the sample is the average value of the
rating results of all persons. If the average value is not an integer, round it off to the nearest
level 0.5 and use “” to express it, for example, 34. If the difference between a single test
result and the average value exceeds half a level, then, the rating of each specimen shall be
reported at the same time.
10 Test Report
The test report shall include the following content:
a) Serial No. of this document;
b) Description of the sample;
c) Friction load used in the test;
d) Description of the abrasive used;
e) Humidity conditioning conditions of the sample;
f) Number of abrasion times of the sample;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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