The safety level of clothing fabrics is mainly divided according to the national standard GB 18401 "National Basic Safety Technical Specifications for Textile Products", which is divided into three categories: A, B, and C. There are obvious differences in safety indicators, scope of application and quality characteristics at different levels. The following is a specific introduction:
1. Class A: Infant and child products

• Safety indicators: Formaldehyde content ≤20mg/kg, pH value range is 4.0-7.5, aromatic amine dyes are prohibited, water resistance, sweat resistance, dry friction color fastness ≥3, saliva color fastness ≥4.
• Quality characteristics: Material: Mostly natural fibers (such as organic cotton and combed cotton) are used, the fibers are delicate and soft, skin-friendly and non-irritating.
• Process: The amount of chemical reagents is strictly controlled during the production process, and the dyeing process is environmentally friendly to avoid residual harmful substances.
• Applicable scenarios: Applicable to clothing worn by infants and young children aged 36 months and below, such as baby jumpsuits, diapers, bedding, etc., to ensure that there are no safety hazards when directly contacting the delicate skin of infants and young children.

2. Class B: Products that come into direct contact with the skin

• Safety indicators: Formaldehyde content ≤75mg/kg, pH value range is 4.0-8.5, and other indicators are consistent with Class A.
• Quality characteristics: Material: Common fabrics include pure cotton, modal, silk, bamboo fiber, etc., which have good air permeability and moisture absorption, and can meet the needs of daily close-fitting wear.
• Process: Some chemical additives are allowed, but the residual amount needs to be controlled to ensure that the fabric has no obvious irritation to the skin.
• Applicable scenarios: Clothing worn close to the skin, such as T-shirts, shirts, underwear, skirts, pants, etc., suitable for daily direct contact with the skin for adults.

3. Class C: Products that do not come into direct contact with the skin

• Safety indicators: Formaldehyde content ≤300mg/kg, pH value range is 4.0-9.0, and color fastness requirements are slightly lower (water and sweat color fastness ≥3 levels, dry friction color fastness ≥3-4 levels).
• Quality characteristics: Material: Polyester, acrylic and other synthetic fibers, or cotton and linen blended fabrics are mostly used. The material is relatively thick and wear-resistant, but the skin-friendliness is slightly worse than that of A and B grades.
• Process: The chemical treatment process may be more complicated (such as waterproof and wrinkle-proof treatment), but it is necessary to ensure that the residual amount of harmful substances meets the standard.
• Applicable scenarios: Clothing that does not directly contact the skin, such as coats, overcoats, curtains, sofa covers, etc., is mainly used for covering or decoration, and has low requirements for close-fitting comfort.

Summary
The three-level safety standards of A, B, and C classify clothing fabrics from the perspective of health and safety. Grade A represents the highest safety quality and is suitable for the most sensitive people; Grade B is the basic safety requirement for daily close-fitting clothing; Grade C focuses on the practicality of non-close-fitting scenes. When purchasing, you can check the safety category on the clothing label to determine whether it meets the use requirements.