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GB/T 8878-2023 English PDF (GBT8878-2023)

GB/T 8878-2023 English PDF (GBT8878-2023)

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GB/T 8878-2023: Knitted underwear

This document stipulates the size, requirements, testing, sampling rules, judgment rules, product instructions, packaging, transportation and storage of knitted underwear. This document applies to knitted underwear mainly made of knitted fabrics. This document does not apply to clothing for infants and young children aged 36 months and below.
GB/T 8878-2023
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.080.30
CCS W 63
Replacing GB/T 8878-2014
Knitted underwear
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ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Size ... 8
5 Requirements ... 8
6 Testing ... 11
7 Sampling rules ... 18
8 Judgment rules ... 18
9 Product instructions, packaging, transportation and storage ... 19
Knitted underwear
1 Scope
This document stipulates the size, requirements, testing, sampling rules, judgment rules, product instructions, packaging, transportation and storage of knitted underwear. This document applies to knitted underwear mainly made of knitted fabrics. This document does not apply to clothing for infants and young children aged 36 months and below.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 250, Textiles - Tests for colour fastness - Grey scale for assessing change in colour
GB/T 251, Textiles - Tests for colour fastness - Grey scale for assessing staining GB/T 1335 (all parts), Standard sizing systems for garments
GB/T 2910 (all parts), Textiles - Quantitative chemical analysis
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 - Colour fastness to rubbing GB/T 3921-2008, Textiles - Tests for colour fastness - Colour fastness to washing with soap or soap and soda
GB/T 3922, Textiles - Tests for colour fastness - Colour fastness to perspiration GB/T 4802.1-2008, Textiles - Determination of fabric propensity for fuzzing and pilling - Part 1: Circular locus method
GB/T 4856, Package of cotton goods and knitwear
GB/T 5296.4, Instructions for use of products of consumer interest - Part 4: Textiles and apparel
GB/T 5713, Textiles - Tests for colour fastness - Colour fastness to water GB/T 6411, A series of size of knitted underwear
GB/T 6529, Textiles - Standard atmospheres for conditioning and testing GB/T 7573, Textiles - Determination of pH of aqueous extract
GB/T 8170, Rules of rounding off for numerical values and expression and judgment of limiting values
GB/T 8629-2017, Textiles - Domestic washing and drying procedures for textile testing
GB/T 14801, Test method for skewness and bow in woven and knitted fabrics GB/T 17592, Textiles - Determination of the banned azo colourants
GB 18401, National general safety technical code for textile products
GB/T 19976-2005, Textiles - Determination of bursting strength - Steel ball method GB/T 29862, Textiles - Identification of fiber content
GB 31701, Safety technical code for infants and children textile products GB/T 38015, Textiles - Quantitative chemical analysis - Mixtures of elastane and certain other fibers
GSB 16-1523, Sample photos of fuzzing and pilling of knitted fabrics
GSB 16-2159, Standard depth sample (1/12) of knitted products
GSB 16-2500, Color sample photos of surface defects of knitted fabrics
FZ/T 01026, Textiles - Quantitative chemical analysis - Multi-component fibre mixtures
FZ/T 01057, Test method for identification of textile fibres
FZ/T 01101, Textile test method - Fiber content - Quantitative physical analysis 3 Terms and definitions
No terms and definitions need to be defined in this document.
6.1.1.2 Before testing the dimensional change rate of washing, pre-conditioning shall be carried out according to the standard atmosphere specified in GB/T 6529, and the test shall be carried out after a qualified conditioning.
6.1.2 Test method
6.1.2.1 Formaldehyde content
Follow the regulations of GB/T 2912.1.
6.1.2.2 pH
Follow the regulations of GB/T 7573.
6.1.2.3 Unpleasant odor
Follow the regulations of GB 18401.
6.1.2.4 Resoluble carcinogenic aromatic amine dyes
Follow the regulations of GB/T 17592.
6.1.2.5 Fiber content
Follow the regulations of GB/T 2910 (all parts), GB/T 38015, FZ/T 01026, FZ/T 01057 (all parts), FZ/T 01101.
6.1.2.6 Bursting strength
Follow the regulations of GB/T 19976-2005, where the diameter of the steel ball is (38??0.02) mm.
6.1.2.7 Pilling
Follow the regulations of Method E in GB/T 4802.1-2008, and base the rating of fuzzing and pilling sample of knitted fabrics on GSB 16-1523. When the surface of the fabric is uneven due to structures such as jacquard, different structural parts can be selected for testing according to the actual situation, and the lowest value is taken as the result.
6.1.2.8 Dimensional change rate of washing
6.1.2.8.1 Measurement locations
For jackets, the calculation is based on the average value of the front, back, left, and right jacket lengths in the vertical direction, and the measurement value of the front jacket length in the horizontal direction. For the pants, the calculation is based on the average value of the left and right pants lengths in the vertical direction, and the average value 10 cm from the left and right crotch lengths in the horizontal direction. Mark L1 ?€? the average value of the dimension after washing in the vertical or horizontal direction (accurate to 0.1 cm), in centimeters (cm);
L0 ?€? the average value of the dimension before washing in the vertical or horizontal direction (accurate to 0.1 cm), in centimeters (cm).
6.1.2.9 Color fastness to water
Follow the regulations of GB/T 5713.
6.1.2.10 Color fastness to soaping
Follow the test condition A (1) of GB/T 3921-2008.
6.1.2.11 Color fastness to perspiration
Follow the regulations of GB/T 3922.
6.1.2.12 Color fastness to rubbing
Follow the regulations of GB/T 3920, for only the vertical direction.
6.1.2.13 Staining degree of lotion
Prepare and wash the sample according to method A (1) in GB/T 3921-2008; then, use qualitative filter paper (medium speed) to filter to remove impurities in the residual soap solution; pour the filtered soap solution into a colorimetric tube with a diameter of 25 mm; pour the soap solution that has not been washed and has the same temperature as the test temperature into another colorimetric tube (diameter 25 mm) as a reference sample. Under the D65 standard light source, with the white cardboard without fluorescent whitening agent as the background, place the cardboard on the rating frame, and evaluate the staining degree of the lotion according to GB/T 251. The amount of soap solution poured into the colorimetric tube is about 50 mL, and the distance between the colorimetric tube and the white cardboard, during the rating, is about 10 cm, to avoid interference from the shadow of the colorimetric tube. The rating must be completed within 15 minutes.
6.1.2.14 Appearance quality after washing
Wash and dry according to the provisions of the test method of dimensional change rate of washing in this document, and evaluate the washed underwear according to the requirements of Table 1.
6.2 Appearance quality inspection
6.2.1 Inspection conditions
It is generally inspected under a light source with illumination not less than 600 lx. If natural light is used indoors, natural north light shall prevail. During inspection, the

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