China has issued a new national product standard, GB/T 41788-2022, for multifunctional knitted productswhich becomes effective May 1, 2023.
The Standardization Administration of China issued its national standard for multifunctional knitted products, GB/T 41788-2022, which becomes effective May 1, 2023, and was included in China’s No. 13 announcement of approved national standards in 2022.
This document is applicable to multifunctional knitted products.
Multifunctional knitted products are defined as:
- Knitted products which are made of fabrics with two or more different functions where the knitted parts account for 70 percent or more of the total area, or
- Knitted products which are made of two or more different kinds of functional fabrics where the knitted parts account for 70 percent or more of the total area
Note 1: if the knitted products are made of multi-layer fabrics, each fabric layer shall have two or more functions, where each layer of the functional knitted fabrics accounts for 70 percent or more of the total area.
Note 2: the conventional protection properties and decorative properties for garments and accessories are excluded.
Products within scope can be divided into the following three categories, according to the end use:
- Knitted garments, e.g. underwear, outerwear, brassieres, swimming suits, sportswear, home-wear, T-shirts, etc.
- Knitted accessories, e.g. caps, hosiery, gloves, sheets, towels, desk cloths, etc.
- Knitted fabrics, e.g. jersey, interlock, warp lace, wool pile fabrics, etc.
The functional requirements shall comply with the requirements of table 1 in GB/T 41788-2022.
The functional category and correspondent test items are detailed in the table below.
|No.||Functional category||Correspondent test items|
|1||Water resistance||Spray rating and hydrostatic pressure rating|
|2||Water vapor transmission of fabrics||Water vapor transmission rate|
|3||Absorption and ability to dry quickly||Drip diffusion time, wicking height and evaporation rate|
|4||Warmth retention property||Warmth retention ratio|
|5||Cool feeling property||Contact cool feeling coefficient|
|6||Solar ultraviolet radiation protective property||UPF and T(UVA)AV|
|7||Electrostatic property||Electric charge and static half period|
|8||Oil repellency;||Oil repellency grade|
|9||Anti-soil property||Stain resistance and soil release|
|10||Iron-free performance||The smoothness appearance of fabrics after cleaning, the appearance of creases in fabrics after cleaning, the smoothness appearance of seams in fabrics after cleaning, and dimensional change after cleaning|
|11||Antibacterial activity||Inhibition rate|
|12||Deodorant property||Odor reduction rate|
|13||Anti-mite activity||Inhibition rate or percent repellency|
|14||Anti-mold activity||Anti-mold effect|
|15||Anti-mosquito property||Percent repellency or knock-off rate or killing rate|
|16||Radiation resistance||Electromagnetic shielding effectiveness|
|17||Infrared radiation property||Far infrared emissivity and far infrared radiation temperature rise value|
|18||Magnetic property||Magnetic induction|
|19||Moisture absorption property;||Moisture absorption heating temperature rise value|
|20||Heat and moisture property||Thermal resistance, water vapor permeability index and overall moisture management capability|
Chemical control requirements for functional products
Applicable products must comply with the requirements of GB 18401 and GB 31701, and the multifunctional knitted products with the claimed functional category in Table 2 of GB/T 41788-2022 shall also comply with the requirements in Table 2 of GB/T 41788-2022.
Details of the technical content
For more information, please refer to the China National Standard GB/T 41788-2022 for multifunctional knitted products, or contact SGS directly.
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