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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 29868-2013 General technical criterion for knitted sports protection article and the following main changes have been made with respect to GB/T 29868-2013:
——The application scope of this standard is modified (see Clause 1; Clause 1 of Edition 2013);
——The normative references are modified and supplemented (see Clause 2; Clause 2 of Edition 2013);
——Some indexes and specifications are revised, including increasing the color fastness to wet rubbing, changing the name of "metal hazards" to "sharp objects such as metal needles", changing the examination item of tensile elastic recovery rate from "horizontal" to "extended", and adding the conditions for not examining this item (see Table 1 and 3.3; Table 1 and 3.3 of Edition 2013);
——The test method for tensile elastic recovery rate is modified (see 4.9; 4.8 of Edition 2013);
This standard was proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of SAC/TC 291 National Technical Committee on Sports Goods of Standardization Administration of China.
The previous edition of this standard is as follows:
——GB/T 29868-2013.
Sports protective products -
Knitted products general technical requirements
1 Scope
This standard specifies the basic technical requirements, testing methods and sampling rules of knitted sports protective products. Other requirements for sports protective products shall be executed according to relevant product standards.
This standard is applicable to knitted sports protective products which are woven with textile fiber as the main raw material and formed by knitting technology or which are made by combining knitted fabrics with polyurethane foam materials, including ankle protection, leg protection, knee protection, waist protection, wrist protection, arm protection, elbow protection, shoulder pad and headband.
This standard is not applicable to the sports protective products for infants of 36 months or below.
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 2912.1 Textiles - Determination of formaldehyde - Part 1: Free and hydrolyzed formaldehyde (water extraction method)
GB/T 3920 Textiles - Tests for colour fastness - Color fastness to rubbing
GB/T 3922 Textiles - Tests for color fastness - Color fastness to perspiration
GB/T 5713 Textiles - Tests for color fastness - Color fastness to water
GB/T 7573 Textiles - Determination of pH of aqueous extract
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 17592 Textiles - Determination of the banned azo colorants
GB/T 17593.1 Textiles - Determination of heavy metals - Part 1: Atomic absorption spectrophotometry
GB/T 17593.2 Textiles - Determination of heavy metals - Part 2: Inductively coupled plasma atomic emission spectrometry
GB/T 17593.4 Textiles - Determination of heavy metals - Part 4: Arsenic and mercury - Atomic fluorescence spectrophotometry
GB 18401 National general safety technical code for textile products
GB/T 24121 Textile products - Determination of the remains of broken sewing needle
GB/T 24153 Rubber and elastomer materials - Determination of N-nitrosamines
GB 31701 Safety technical code for infants and children textile products
FZ/T 70006-2004 Stretch and recovery testing method for knits
3 Basic technical requirements
3.1 The basic technical requirements shall be in accordance with those specified in Table 1.
Table 1 Basic technical requirements
Item Technical requirements
Colour fastness to perspiration/grade ≥ Discolouring 3
Staining 3
Colour fastness to water/grade ≥ Discolouring 3
Staining 3
Colour fastness to rubbing/grade ≥ Dry rubbing 3
Wet rubbing 2-3
Formaldehyde content/ (mg/kg) In accordance with those specified in GB 18401
pH value
Peculiar smell
Decomposable carcinogenic aromatic amine dyes/ (mg/kg)
Sharp objects such as metal needles Absent
Tensile elastic recovery rate /% ≥ Extended 88
Extractable heavy metal/(mg/kg) ≤ Lead (Pb) 1.0
Cadmium (Cd) 0.1
Arsenic (As) 1.0
N-nitrosamine /(mg/kg) Absent
3.2 The products for children shall meet the requirements of GB 31701.
3.3 The tensile elastic recovery rate is only assessed for cylindrical products containing elastic materials such as spandex and rubber bands, and products fitted with knitted fabric and polyurethane foam are not assessed.
3.4 In the N-nitrosamine item, only rubber bands used in protective gear are tested. See Annex A for the list of N-nitrosamines that cannot be detected, and the limit value is less than or equal to 0.5mg/kg.
4 Inspection methods
4.1 Test for color fastness to perspiration
In accordance with GB/T 3922.
4.2 Test for color fastness to water
In accordance with GB/T 5713.
4.3 Test for colour fastness to rubbing
In accordance with GB/T 3920, the general assessment is longitudinal direction.
4.4 Test for formaldehyde content
In accordance with GB/T 2912.1.
4.5 pH value test
In accordance with GB/T 7573.
4.6 Peculiar smell test
In accordance with GB 18401.
4.7 Test for decomposable carcinogenic aromatic amine dyes
In accordance with GB/T 17592.
4.8 Test for sharp objects such as metal needles
In accordance with GB/T 24121; test sensitivity (standard iron ball test card): 1.0mm.
4.9 Test for tensile elastic recovery rate
In accordance with FZ/T 70006-2004, 8.3.2.2. Only the extension direction of the product is tested, generally the transverse tension. No damage to products, double-layer clamping. The width of the clamp is greater than or equal to 50mm, the constant speed of the holder movement is 300mm/min, the return speed is 300mm/min, the fixed force is 35N, and the number of repeated stretching times is 3. According to the size of the specimen, the distance length of the tester may be 50mm or 100mm. If the height of the product, that is, the width of the clamped specimen, is less than 50mm, test according to the actual size. For products with elastic mouth, the elastic mouth may be clamped; for products without elastic mouth, any part may be clamped. The average of three specimens shall be taken and rounded to an integer according to GB/T 8170.
4.10 Test for extractable heavy metals
Tests for extractable heavy metal plumbum (Pb) and cadmium (Cd) shall be carried out according to GB/T 17593.1, and tests for heavy metal arsenic (As) shall be carried out according to GB/T 17593.4. Or the heavy metals such as plumbum (Pb), cadmium (Cd) and arsenic (As) can be measured according to GB/T 17593.2.
4.11 N-nitrosamine test
In accordance with GB/T 24153. When using gas chromatography-mass spectrometry (GC-MS) to test the content of N-nitrosamine, there may be false positive result. If yes, it is recommended to use high performance liquid chromatography-mass spectrometer (HPLC-MS/MS) or other suitable methods to confirm the result.
5 Sampling rules
Randomly sample according to the delivery batch, and the quantity shall ensure that each test in Clause 4 is done once.
Foreword II
1 Scope
2 Normative references
3 Basic technical requirements
4 Inspection methods
5 Sampling rules
Annex A (Normative) List of N-nitrosamines that shall not be detected
