Recently, the Chongqing Municipal Quality Supervision Bureau sampled 15 batches of knitted underwear products from 11 local production enterprises, and the result was 8 batches of qualified products, with a pass rate of 53.3%.

The city's Quality Supervision Bureau also exposed 7 kinds of unqualified knitted underwear products.

The main problems found in the spot checks are as follows: first, the pH value is not qualified.

According to the relevant regulations of the state, the pH value of direct contact with skin products should be within the range of 4 to 7.5. The pH value of 2 batches of products in this sampling inspection exceeds the requirements stipulated in the national standard, and the pH value is alkaline.

Two is the washing size change rate is not qualified.

The disqualification of the project will affect the performance of the product after washing. There are 5 batches of washing products whose size change rate is not up to standard in the spot checks. The main reason is that the manufacturers do not deal with the fabric shaping process after buying the fabrics.