After more than two years, the newly revised national compulsory standard for plastic runways-"Synthetic Surface Sports Fields for Primary and Secondary Schools" GB 36246-2018 was officially approved on the website of the National Standardization Management Committee, showing that the release date is May 7. After the implementation of the new national standard, GB / T 19851.11-2005 GB / T 19851.11-2005 "Sports Equipment and Venues for Primary and Secondary Schools: Part 11: Sports Surfaces for Synthetic Materials" issued in 2005 was abolished.
Sports areas with synthetic surfaces for primary and middle schools drafted by the Ministry of Education (Basic) under the jurisdiction, execution, and supervision of the Ministry of Education Educational Equipment Research and Development Center It was officially released on the national standard information public service platform on July 7, and was officially implemented on November 1, 2018.
New national standard VS old national standard
1. Difference between standard numbers
New national standard number: GB 36246-2018
Old national standard number: GB / T 19851.11-2005
From the standard number, we can see the determination of the national ministries and commissions to regulate the plastic runway and plastic stadium market. The standard has been changed from the original GB / T (national recommended standard) to GB (national mandatory standard). After the acceptance of the venue, there are mandatory standards.
2. The basic technical indicators of the new and old national standards are different
The basic technical indicators of the new and old national standards are different, and have the following requirements (the attached table is an excerpt from the revised version of the new national standard in July 2017, please refer to the final approval of the published indicators):
1. The thickness requirements of the plastic track and the court are different
Note: There is not much elaboration and specific requirements on the thickness of the old national standard. The new national standard obviously requires greater than or equal to 8mm. For the usual 3-5mm stadium, it has changed dramatically! Because of the customary practice of plastic track, at least 10mm Thickness, the old national standard is also acceptable, the new national standard obviously meets the requirements of the industry market, and strictly requires the thickness of the plastic runway to be ≥13mm.
2. Different physical properties
Compared with GB / T19851.11-2005, the new national standard adds a synthetic sports ground layer, cast-in-place surface layer, prefabricated surface layer, artificial grass, impact absorption, vertical deformation, anti-slip value, tensile strength, tensile strength Items and indicators such as length rate, aging resistance, flame retardancy, slope, thickness, etc. Only the comparison between the new national standard and GB / T14833-2011 is made here:
Serial number
project
Old national standard (14833-201)
New National Standard
Non-permeable
Water permeability
1
Shock absorption
35-50
35-50
35-50
2
Vertical deformation
0.6-2.5
0.6-2.5
≤3.0
3
Tensile strength (MPa)
≥0.4
≥0.5
≥0.4
4
Elongation at break%
≥40
≥40
≥40
5
Anti-slip value (BPN, 20ºC)
≥47
≥47
47-110 (wet measurement) or 80-110 (dry measurement)
6
Flame retardant (level)
1
1
1
Aging resistance
Tensile strength (MPa)
no
no
Tensile strength and elongation at break after xenon lamp irradiation for 168h
Elongation at break%
no
no
3. The limits of chemical hazardous substances are very different
Compared with GB / T19851.11-2005 and GB / T14833-2011, the gap between the new national standard in terms of chemical properties and hazardous substance limits is considered a radical reform.
project
Old national standard
New National Standard
Harmful substance content
6 phthalate compounds (D8P, B8P, DEHP, DNOP, DINP, DIDP) /%
no
≤2.0
Polycyclic aromatic hydrocarbons (sum of 18 species) / (mg / kg)
no
≤50
Benzene [a] pyrene / (mg / kg)
no
≤1.0
Benzene (g / kg)
≤0.05
no
Total toluene + xylene (g / kg)
≤0.05
no
Short-chain chlorinated paraffin (C10-C13) / (g / kg)
≤1.5
4,4'-Diamino-3,3'-dichlorodiphenylmethane (MOCA) / (g / kg)
≤1.0
The sum of free toluene diisocyanate (TDI) and free hexamethylene diisocyanate (HDI) / (g / kg)
Free toluene diisocyanate ≤0.2
≤0.2
Free diphenylmethane isocyanate (MDI) / (g / kg)
≤0.4
Soluble lead
≤90
≤50
Soluble chromium
≤10
≤10
Soluble chromium
≤10
≤10
Soluble mercury
≤2
≤2
The amount of harmful substances released
Total volatile organic compounds (TVOC) / (mg / m² · h)
≤5.0
Formaldehyde / (mg / m² · h)
≤0.3
Benzene / (mg / m² · h)
≤0.1
Sum of toluene, xylene and ethylbenzene / (mg / m² · h)
≤1.0
Free toluene diisocyanate (TDI)
no
Free diphenylmethane diisocyanate (MDI)
no
Carbon disulfide / (mg / m² · h)
≤1.0
Odor level / level
≤3
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