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GB 20653-2020: Protective clothing--High visibility warning clothing for professional use
GB 20653-2020
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
ICS 13.340.10
C 73
Replacing GB 20653-2006
Protective clothing - High visibility warning clothing for
professional use
(ISO 20471:2013, High visibility clothing - Test methods and requirements,
MOD)
ISSUED ON: JULY 23, 2020
IMPLEMENTED ON: AUGUST 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 9
4 Level and design requirements ... 10
5 Performance requirements for background materials, non-fluorescent materials and
combined-performance materials ... 14
6 Reflective performance requirements for retroreflective materials and combined-
performance materials ... 17
7 Test methods ... 19
8 Marks, maintenance labels and instructions for use ... 22
Annex A (informative) Typical design styles of warning clothing ... 24
Annex B (informative) Chromaticity diagrams for background materials and combined-
performance materials ... 28
Annex C (normative) Method for determination of retro reflection coefficient ... 29
Annex D (normative) Arrangement of reflective tapes during industrial washing ... 34
Annex E (normative) Method for determination of reflective performance in rainy
conditions ... 35
Annex F (informative) Environmental risk level and visibility clothing design guidance
... 38
Bibliography ... 41
Protective clothing - High visibility warning clothing for
professional use
1 Scope
This Standard specifies the design requirements, material performance requirements,
reflective performance requirements, test methods, marks, maintenance labels and
instructions for use of high visibility warning clothing for occupational use.
This Standard applies to high visibility warning clothing worn by workers in low-
visibility environments to improve their visual visibility.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 250, Textiles -- Tests for colour fastness -- Grey scale for assessing change in
colour (GB/T 250-2008, ISO 105-A02:1993, IDT)
GB/T 251, Textiles -- Tests for colour fastness -- Grey scale for assessing staining
(GB/T 251-2008, ISO 105-A03:1993, IDT)
GB/T 1335.1, Standard sizing systems for garments -- Men
GB/T 1335.2, Standard sizing systems for garments -- Women
GB/T 3920, Textiles -- Tests for colour fastness -- Colour fastness to rubbing (GB/T
3920-2008, ISO 105-X12:2001, MOD)
GB/T 3922, Textiles -- Tests for colour fastness -- Colour fastness to perspiration
(GB/T 3922-2013, ISO 105-E04:2013, MOD)
GB/T 3923.1, Textiles -- Tensile properties of fabrics -- Part 1: Determination of
maximum force and elongation at maximum force using the strip method (GB/T
3923.1-2013, ISO 13934-1:1999, MOD)
GB/T 3978, Standard illuminants and geometric conditions (GB/T 3978-2008, CIE
15:2004, CIE S005:1999, NEQ)
GB/T 3979, Methods for the measurement of object color (GB/T 3979-2008, CIE
Materials that have both background material properties and retroreflective material
properties.
3.8 orientation sensitive material
Retroreflective material that when the rotation angles are 0?? and 90?? respectively, the
difference in retro reflection coefficient is greater than 15%.
3.9 non-fluorescent material
The fabric that usually forms the main body of the outer layer of warning clothing
together with the background material does not meet the requirements for
retroreflective materials and background materials in this Standard.
4 Level and design requirements
4.1 Level
According to the relative strength of visibility, high visibility warning clothing (warning
clothing for short) is divided into 3 levels. Each level of warning clothing shall contain
a corresponding area of visible material (background material, retroreflective material,
or combined-performance material). The minimum usage area of visible materials on
warning clothing is shown in Table 1.
When measuring area, the smallest design size of the clothing shall be selected. Fasten
all zippers, buckles and other fasteners to the minimum position. Place the clothing flat
on a table to measure. The measurement area includes the trunk and limbs.
When calculating the usage area of visibility materials, only materials that meet the
design requirements of 4.2 are included. When using two or more background materials,
color is not considered. Calculate area uniformly. Patterns, printing or labels of any kind
are not included in the calculation of the minimum visible area in Table 1.
A single piece of clothing or a complete set of clothing (such as a top and pants) can be
assessed as a warning clothing level. If after the user puts on the entire set of clothing,
the visible material area of the entire set of clothing satisfies a warning clothing level
higher than that of any single piece of clothing, the level of the warning clothing can be
assessed based on the visible material area of the entire set of clothing. The warning
clothing level of the entire clothing shall be marked on the label and instructions for use
of each individual clothing.
To ensure 360?? visibility, all sides of the clothing shall be designed with visible
materials. Horizontal reflective tape and fluorescent material shall surround the torso,
pant legs and sleeves. The area of visible materials configured on the front and back of
clothing shall not be less than 40% of the minimum usage area of visible materials for
corresponding level warning clothing.
shirts/coats, T-shirts, etc.)
The design of warning clothing (such as jackets, shirts/coats, T-shirts, etc.) that covers
the upper torso and arms shall meet the following requirements. See Figure A.2 for a
schematic diagram of typical design styles.
a) The background material shall surround the upper torso area and sleeves. The
width shall not be less than 50 mm (the area where the background material is
interrupted by the reflective tape is not included). The minimum width of
reflective tape for level 2 and level 3 warning clothing is 50 mm. The minimum
width of reflective tape for level 1 warning clothing is 25 mm.
b) Warning clothing covering the upper torso and arms shall have at least one
reflective strip surrounding the torso. The maximum tilt angle between the
reflective tape and the horizontal line is ??20??. There shall be a reflective strip on
each shoulder extending from chest to back. Extend at least 15 cm from the
shoulder seam to the chest and back or connect to the reflective tape on the torso.
The distance between the bottom of the lowest reflective tape on the torso and the
bottom of the clothing shall be no less than 50 mm. If the clothing has multiple
horizontal reflective tapes, the distance between two adjacent ones shall be no
less than 50 mm.
c) Alternatively, warning clothing covering the upper torso and arms shall have at
least two reflective tapes surrounding the torso when reflective tape surrounds the
sleeves. The distance between adjacent reflective strips shall not be less than 50
mm. The maximum tilt angle between the reflective tape and the horizontal line
is ??20??. The distance between the bottom of the lowest reflective tape on the torso
and the bottom edge of the clothing shall not be less than 50 mm.
d) If the sleeve significantly blocks a horizontal reflective strip on the torso, a circle
of reflective strip shall be placed around the sleeve. If it is long sleeves, the
sleeves shall be surrounded by two reflective tapes spaced no less than 50 mm
apart.
e) If the sleeves significantly block two horizontal reflective strips on the torso, the
sleeves shall be surrounded by two reflective strips spaced no less than 50 mm
apart. The distance between the bottom of the lowest reflective tape and the edge
of the cuff shall be no less than 50 mm. You can move your arms in different
postures and observe how well the sleeves block the horizontal reflective tape.
f) The gaps along the length of strips made of retroreflective material or combined-
performance material (such as plackets or seams) shall be no greater than 50 mm.
If the strip wraps around the torso or sleeves, the total gap on the strip shall not
larger than 100 mm.
4.2.3 Warning clothing that mainly covers the legs (such as trousers, overalls, etc.)
The design of warning clothing that mainly covers the legs (such as trousers, overalls,
etc.) shall meet the following requirements. See Figure A.3 for a schematic diagram of
typical design styles.
a) The background material shall wrap around the pant leg. The width is not less than
50 mm (the area where the background material is interrupted by the reflective
tape is not included). The minimum width of reflective tape for level 2 and level
3 warning clothing is 50 mm. The minimum width of reflective tape for level 1
warning clothing is 25 mm.
b) Warning clothing covering the legs shall have at least two reflective strips spaced
no less than 50 mm apart. The maximum tilt angle of the reflective tape is ??20??.
The distance between the bottom of the lowest reflective tape and the edge of the
pants opening shall be no less than 50 mm.
c) The gaps in the length direction of strips composed of retroreflective materials or
combined-performance materials (such as plackets or seams) shall not be greater
than 50 mm.
4.2.4 Warning clothing that covers the upper torso and legs (such as sleeveless
coveralls)
The design of warning clothing (such as sleeveless overalls) that covers the upper torso
and legs shall meet the following requirements. See Figure A.4 for a schematic diagram
of typical design styles.
a) The background material shall surround the upper torso area and pant legs. The
width is not less than 50 mm (the area where the background material is
interrupted by the reflective tape is not included). The minimum width of
reflective tape for level 2 and level 3 warning clothing is 50 mm. The minimum
width of reflective tape for level 1 warning clothing is 25 mm.
b) The requirements of 4.2.1 and 4.2.3 shall be met simultaneously.
4.2.5 Warning clothing that covers the upper torso, arms and legs (such as
coveralls)
Warning clothing that covers the upper torso, arms and legs (such as coveralls) shall be
designed to meet the following requirements. See Figure A.5 for a schematic diagram
of typical design styles.
a) The background material shall surround the upper torso area, sleeves, and pant
legs. The width is not less than 50 mm (the area where the background material
is interrupted by the reflective tape is not included). The minimum width of
reflective tape for level 2 and level 3 warning clothing is 50 mm. The minimum
width of reflective tape for level 1 warning clothing is 25 mm.
The breaking strength of woven materials in the warp and weft directions shall not be
less than 100 N.
5.5.2 Bursting strength of knitted materials
Test according to the method specified in GB/T 7742.1.
When the test area is 50 cm2, the bursting strength shall not be less than 100 kPa. Or,
when the test area is 7.3 cm2, the bursting strength shall not be less than 200 kPa.
5.5.3 Breaking strength and tearing strength of coated fabrics and composite
fabrics
When the outermost material of the warning clothing is coated fabric or composite
fabric, the breaking strength shall not be less than 100 N (not applicable to materials
with an elongation greater than 50%). Test according to method 1 specified in HG/T
2580-2008.
The tearing strength shall be no less than 20 N (not applicable to materials with
elongation greater than 50%). Test according to Method A specified in HG/T 2581.1-
2009.
5.6 Moisture permeability
Test according to the method specified in GB/T 12704.1.
Except for vests and pullover vests with openings on both sides, the moisture
permeability of the background material and non-fluorescent materials shall not be less
than 5000 g/(m2 ?? 24h).
5.7 Chemical safety performance requirements
Background materials and non-fluorescent materials shall meet the following
requirements.
a) pH value is between 4.0~8.5;
b) The formaldehyde content shall not be greater than 75 mg/kg (direct contact with
skin), or not greater than 300 mg/kg (indirect contact with skin). Conduct pH
value and formaldehyde content tests according to 6.1 and 6.2 of GB 18401-2010.
6 Reflective performance requirements for retroreflective
materials and combined-performance materials
6.1 Reflective properties before physical testing
relative humidity of (65??4)%. If the test needs to be conducted under other conditions,
the test shall be conducted within 5 min after the specimen is removed from the
humidity-controlled environment.
7.2 Color performance
The standard illuminant D65 light source specified in GB/T 3978, the geometric
condition 45/0, and the 2?? standard chromaticity observer are used. Test according to
the method specified in GB/T 3979.
During the test, there shall be a black padding underneath the single-layer specimen
(including the original padding or lining of the clothing). The retro reflection coefficient
of the backing shall be less than 0.04.
Test at least once in each of the four orthogonal directions. Take its mean value. If the
light source is incident from the annulus, only one measurement can be performed.
7.3 Dimensional changes in materials
The preparation, labeling and measurement of samples shall be carried out in
accordance with the relevant provisions of GB/T 8628-2013.
Priority shall be given to cleaning according to the cleaning methods and procedures
recommended in the clothing's instructions for use.
When warning clothing is suitable for industrial laundering, industrial laundering is
preferred.
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