Group 1 - The incident involves a video posted by a netizen on January 9, 2026, showing a "film-like substance" found in the winter school uniforms of Jinshan Third Primary School, which has attracted public attention [1][2] - The school uniforms were procured in May 2025, delivered in July, and began use in September [2] - A joint investigation team was formed by the local government, including education, market supervision, public security, and auditing departments, to conduct a comprehensive verification of the incident [1][3] Group 2 - The procurement process for the school uniforms involved a parent committee and feedback from 2,467 parents, with 98% approval for the purchase, meeting the required two-thirds majority [4] - The school conducted quality checks upon delivery, with reports indicating that the uniforms met safety standards, including being free from formaldehyde and carcinogenic dyes [4] - The production company was verified to have all necessary licenses, and the materials used in the uniforms were confirmed to comply with relevant standards [5] Group 3 - The investigation revealed that the "film-like substance" was actually small pieces of thermoplastic polyurethane (TPU) film that had flaked off due to damage, and the material composition was confirmed to be 100% polyester fiber and TPU [6] - Testing conducted on the material showed it had waterproof and moisture-permeable properties, suitable for use in clothing and other applications [6]