my country’s requirements for fabrics’ perspiration fastness

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Fabric perspiration fastness dyed textiles

There are millions of effective sweat glands on human skin, and the forehead, armpits, chest, back and palms sweat more. ; Therefore, clothing commonly worn in summer, such as shirts, T-shirts and other clothing, will have severe fading in these areas. The composition of human sweat is complex. The main component is salt, which varies from person to person. Sweat can be acidic or alkaline. Short-term contact between textiles and sweat may have little effect on their color fastness, but long-term contact with sweat close to the skin will have a greater impact on certain dyes. Clothing with unqualified dye fastness can easily cause dyes to transfer from textiles to human skin through sweat, etc. Dyestuff molecules and heavy metal ions may be absorbed by the human body through the skin and endanger health.

For the health of consumers, the national mandatory standard GB 18401-2010 “National Basic Safety Technical Specifications for Textile Products” regulates colors that are resistant to (acid, alkali) sweat stains. Fastness rating requirements for Category A products (textile products for infants and young children) are greater than or equal to 3-4; for Category B products (products that directly contact the skin) and Category C products (products that do not directly contact the skin), the requirements are greater than or equal to 3 Level (the color fastness to perspiration is divided into levels 1 to 5, the larger the value, the better the color fastness).

Some textile dyes are not acid-resistant, and some are not alkali-resistant. The sweat color fastness test uses artificial sweat with different pH levels to simulate human body sweat. Test the dye fastness of textiles when sweating.

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