Requirements 4.1 The basic safety technical requirements of products should comply with the regulations of GB 18401, and infant and children's products should comply with the regulations of GB 31701. 4.2 The quality of towel products is divided into high-quality products, first-class products and qualified products. 4.3 The intrinsic quality of towel products includes weight deviation rate, breaking strength, water absorption, hair removal rate, fiber content deviation and color fastness. The intrinsic quality indicators are specified in Table 1. 4.4 The appearance quality of towel products includes size deviation rate, defects, sewing quality and ironing quality. The appearance quality indicators are specified in Table 2. 4.5 Special requirements shall be implemented in accordance with the contractual agreement between the parties.