GB/T 20394-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20394-2019 | English | 225 |
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Gymnastic artificial turf
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| GB/T 20394-2013 | English | 759 |
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Gymnastic artificial turf
| Obsolete |
| GB/T 20394-2006 | English | 719 |
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Gymnastic artificial turf
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GB/T 20394-2019: Gymnastic artificial turf---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/GBT20394-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.220.10
Y 55
Replacing GB/T 20394-2013
Gymnastic artificial turf
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: AUGUST 30, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Product classification and specifications ... 7
5 Requirements ... 8
6 Test method ... 9
7 Inspection rules ... 16
8 Marking, packaging, transportation and storage ... 17
Appendix A (Normative) Method of sampling and intercepting test samples of
gymnastic artificial turf ... 19
Appendix B (Normative) Abrasion resistance test of grass filament ... 20
Gymnastic artificial turf
1 Scope
This standard specifies the product classification and specifications,
requirements, test methods, inspection rules, markings, packaging,
transportation and storage of gymnastic artificial turf.
This standard applies to artificial turf paving sports venues.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and
testing
GB 6675.4-2014 Safety of toys - Part 4: Migration of certain elements
GB/T 8430-1998 Textiles - Tests for color fastness - Color fastness to artificial
weathering: Xenon arc fading lamp test
GB/T 11049-2008 Burning behavior of carpets - Tablet test at ambient
temperature
GB 18587-2001 Indoor decorating and refurbishing materials-Limitations of
harmful substances emitted from carpets, carpet cushions and adhesives
QB/T 1090-2001 Test method for pull-out force of carpet tufting
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Gymnastic artificial turf
The artificial synthesis paving materials formed by mechanical tufting,
weaving, fixing synthetic fiber similar to the appearance of natural grass on
Tuft
The smallest tufted unit of gymnastic artificial turf.
3.10
Vertical rate
The number of tufts per meter of gymnastic artificial turf in the longitudinal
direction.
3.11
Horizontal rate
The number of rows of artificial grass per meter horizontally.
3.12
Dtex
The mass (g) of 10000 m long artificial grass filament.
3.13
Tuft density
The number of tufts per square meter of gymnastic artificial turf.
4 Product classification and specifications
4.1 Product classification
According to the shape of artificial grass filament for sports, it is divided into
tape yarn, monofilament, curly.
4.2 Product specifications
The specification of gymnastic artificial turf shall include at least:
a) Longitudinal rate (tufts/m);
b) Horizontal rate (row/m);
c) Pile height (mm);
d) Dtex (g/10000 m).
Perform interception according to the method specified in Appendix A.
6.2 Standard environment for specimen conditioning and test
It is performed according to Chapter 4 and Chapter 5 of GB/T 2918-1998; the
test temperature is (23 ± 2) °C, the relative humidity is (50 ± 10)%, the specimen
state conditioning time is 4 h.
6.3 Appearance quality
Check visually in natural light.
6.4 Tuft density
6.4.1 Specimen preparation
Select the test area on the backing of the gymnastic artificial turf. The
longitudinal and cross section sampling length shall not be less than 1100 mm.
6.4.2 Test procedure
6.4.2.1 Vertical rate
Count the number of longitudinal tufts to reach the nominal tuft density. Use a
steel ruler which has an accuracy of 1 mm to measure the corresponding length
L; it shall be measured at three different positions.
6.4.2.2 Horizontal density
Count the number of rows of tufts to reach the nominal row number of tuft. Use
a steel ruler which has an accuracy of 1 mm to measure the corresponding
length L; it shall be measured at three different positions.
6.4.2.3 Calculation
The arithmetic mean value ρ of the vertical rate and horizontal rate of tuft is
calculated according to formula (1):
Where:
ρ - The arithmetic mean of the vertical rate and horizontal rate; the unit is tuft
per meter (tuft/m) or row per meter (row/m);
N - Nominal vertical rate or horizontal rate of tuft, in units of tuft per meter
(tuft/m) or rows per meter (rows/m);
Use distilled water to rinse it. Compare it with the unsoaked specimen through
visual inspection in natural light.
6.9 Alkali resistance test
Take a specimen of 50 mm × 50 mm gymnastic artificial turf. Soak it in a 30%
sodium carbonate solution with a concentration of 20% for 48 hours. Take out
the specimen. Use distilled water to rinse it. Compare it with the unsoaked
specimen through visual inspection in natural light.
6.10 Grass filament breaking force
6.10.1 Specimen preparation
Randomly select 5 tufts of grass filament in different rows. Select one grass
filament from each tuft for the tensile test of the grass filament.
6.10.2 Test procedure
Carry out the test on a tensile testing machine which has an accuracy of 1 N or
more; the test speed is (250 ± 25) mm/min. Record the value of the tensile force
when the specimen breaks. Test 5 specimens. Take the arithmetic mean of the
results, accurate to 1 N.
Note: If the difference between the test result of a specimen and the average value
exceeds 30%, the test of the specimen is invalid and the test shall be repeated.
6.11 Abrasion resistance of grass filament
The retention rate of grass filament's abrasion resistance shall be carried out in
accordance with the method specified in Appendix B.
6.12 Aging performance
6.12.1 Test conditions
After 168 h aging test in accordance with GB/T 8430-1998, carry out the test of
the retention rate of grass filament's breaking force and the color fastness to
weathering.
6.12.2 Retention rate of grass filament's breaking force after aging test
6.12.2.1 The sampling and test procedures shall be carried out in accordance
with 6.10.
6.12.2.2 The retention rate μ of the breaking force of the grass filament is
calculated according to formula (8):
6.18 Flame retardancy
Intercept 3 pieces of 230 mm × 230 mm specimens of gymnastic artificial grass.
Fill them with appropriate amount of quartz sand and rubber particles (the
volume ratio of quartz sand and rubber particles is 1:1); ensure that the height
of the exposed grass filaments after filling is 10 mm. Perform test according to
Chapter 6 of GB/T 11049-2008. Measure the maximum distance from the center
of each specimen to the damaged edge. The result is represented by the
maximum value of the three specimens.
7 Inspection rules
7.1 Exit-factory inspection
7.1.1 The product can only be exit-factory after being qualified by the
manufacturer.
7.1.2 The exit-factory inspection items shall be inspected in accordance with
5.1 appearance and Table 1 product specifications and dimensions.
7.2 Type test
7.2.1 Type test shall be carried out when one of the following situations occurs
a) When the new product is finalized and appraised;
b) When production is discontinued for six months;
c) When there are major changes in raw materials and production processes
that may affect product performance;
d) During normal production, once a year;
e) When the quality department supervises the spot check.
7.2.2 The type inspection shall be carried out by taking samples from the
products that have passed the exit-factory inspection.
7.2.3 Type inspection items shall be carried out in accordance with the
requirements of Chapter 5.
7.3 Sampling
Randomly take samples in batches. If the batch is within 30 rolls (including 30
rolls), take 1 roll; if the batch is more than 30 rolls, take 2 rolls.
7.4 Judgment rules
Appendix A
(Normative)
Method of sampling and intercepting test samples of gymnastic artificial
turf
A.1 Scope
This method is suitable for sampling and intercepting test samples of gymnastic
artificial turf.
A.2 Sampling requirements
Select a batch of products as specimens.
A.3 Procedure
A.3.1 Select samples
Samples shall be selected along the entire width of the product, but do not
include any parts that are normally cut off during the production process.
A.3.2 Intercept samples
A.3.2.1 The specimen can be square or rectangular. The truncated edge shall
be parallel and perpendicular to the longitudinal and transverse edges of the
sample. For the paved site, it shall be parallel or perpendicular to the edge of
the site.
A.3.2.2 The cut specimen shall be at least 100 mm away from the edge.
A.3.2.3 If more than one specimen needs to be intercepted on the sample,
these specimens shall be evenly and dispersedly arranged, as far as possible
from the available sampling area, meanwhile ensure (as the structure allowed)
each specimen is distributed in different longitudinal and transverse positions.
A.3.2.4 When cutting specimens on the sample, they shall be widely distributed
in the entire available sampling area; when cutting multiple specimens, they
shall be evenly distributed on the sample.
A.3.2.5 If it needs to do several tests on the sample, the specimens taken shall
be distributed as far as possible on the sample, for example, using a random
number table to indicate the position on the network.
A.3.2.6 When sampling on a paved site, it shall take full consideration to
sampling in different areas; the relevant parties shall negotiate and decide.
Appendix B
(Normative)
Abrasion resistance test of grass filament
B.1 Scope
This method is suitable for the abrasion resistance test of grass filament in the
laboratory.
B.2 Principle
The specimen is worn under the action of a pair of grinding wheels; then the
overall damage is measured.
B.3 Test equipment
B.3.1 Rotating platform, double-head grinding machine.
B.3.2 A pair of grinding wheels with newly replaced abrasion plates, with 500 g
weight placed on each wheel.
B.3.3 Balance, with an accuracy of ±0.01 g.
B.4 Specimen
Take 3 unused specimens which have a length of at least 100 mm and a width
of at least 100 mm; trim the grass filament with a pile height of more than 15
mm to 15 mm; those which has a pile height of less than 15 mm is tested directly.
Or otherwise take one piece of used specimen which has a length of at least
100 mm and a width of at least 100 mm; trim the grass filament with a pile height
of more than 15 mm to 15 mm; those which has a pile height of less than 15
mm is tested directly.
B.5 Test procedure
Use a balance to weigh the weight of specimen. Place the specimen on the
corresponding position in the abrasion machine. Lower the grinding wheel to
place it on the specimen. Turn on the machine. Shutdown the machine after
1000 rotations. Remove the loose debris on the specimen. Use the balance to
re-weigh the weight of specimen.
Repeat 5 times, to make the specimen subjected to 5000 rotations in total.
Replace the grinding stone pieces on the grinding wheel after every 1000
rotations.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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