The pH value of textiles refers to the residual acid and alkali content in the fabric. It is one of the quantitative targets for harmful substances that affect human safety and health. The national standard GB18401-2010 “National Basic Safety Technical Specification for Textile Products” stipulates that the PH value of infants and children and textile products that directly touch the skin should be controlled between 4.0 and 8.5, and the PH value of textile products that do not directly touch the skin should be controlled at 4.0. ~9.0. If the product requires non-final products that must undergo wet treatment in subsequent processing techniques, the pH value can be relaxed to between 4.0 and 10.5.
Human skin usually has a pH value between 5.5 and 7.0, which is slightly acidic. Excessive PH value of textiles will destroy the weakly acidic environment on the surface of human skin, cause itching, make the skin susceptible to damage by other bacteria, and even cause symptoms such as dermatitis.
In addition, if the pH value of textiles is too high or too low, the fabrics will be easily damaged during storage. It can be seen that the PH value of textile products is not only closely related to the health of consumers, but also inseparable from the quality of the textile products themselves.
There are many reasons for excessive PH value. However, after the fabric is printed and dyed, it is dried before leaving the factory without being fully washed, and at the same time, certain neutralization measures are not taken, which are the main reasons for the unqualified PH value. In addition, defective fabrics, etc. can also cause pH overshoot.
Therefore, the Nantong State Inspection and Quarantine Bureau reminds consumers that when purchasing textile products, they must first read the information on the product tags and try not to purchase low-level defective products. According to the classification of the “National Basic Safety Technical Standards for Textile Products”, textile products can be divided into three safety levels: A, B, and C. That is, products for infants and young children (36 months and below) should meet the technical requirements of Class A products and should not be exposed to direct contact. Products that touch the skin should meet the technical requirements of Category B products, and products that do not directly touch the skin should meet the technical requirements of Category C products. It is best to purchase textile products marked as “Category C” or “Qualified Products” with caution. Secondly, after buying new products, especially children’s, infant products, underwear and other textile products that come into direct contact with the human body, do not wear them directly. It can be rinsed with clean water before wearing, which can effectively reduce harmful substances in textile products and keep the PH value within the standard range as much as possible.
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