Different types of products also reflect formaldehyde content, pH value and other indicators. The formaldehyde content of Class A products must be less than 20 mg/kg, and the pH value is allowed to be in the acidic range of 4.0~7.5. The formaldehyde content of Class B products is lower than 75 mg/kg, and the pH value is the same as that of Class A products. Class c products require formaldehyde content below 300mg/kg, and the allowable pH value is in the range of 4.0~9.0.

Extended data:

Precautions:

The pH value of human skin ranges from 5.5 to 7.0, which is slightly acidic. The acidic environment of the skin can inhibit the growth and reproduction of some pathogenic bacteria and protect the skin from infection. But the pH value of textiles is determined by the production and processing process. When the skin comes into contact with the acid and alkali residue on the clothes, it will cause allergies. If the pH value of textiles is too high or too low, it will not only irritate the skin, but also cause skin infection.

The limited difference between Class B textiles and Class C products lies in formaldehyde content and pH value. These indicators mainly depend on the internal quality indicators of flour accessories, so it is necessary to ensure that the internal quality of flour accessories used reaches the standard before clothing production.

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