The reporter conducted some tracking. According to the reporter's inspection, the report that the plastic track will release toxic gases first broke out after the second China School Sports Science Conference held in late October. At that meeting, an expert from the Beijing Academy of Educational Sciences said that the main components of the plastic track laid by the school are mostly industrial polyurethane materials, mainly toluene diisocyanate, which is confirmed by relevant environmental monitoring agencies. The material produced in the hot or strong light will release toluene diisocyanate gas, which is very harmful to the human body. The expert called for “terminating the school to lay the plastic track as soon as possible”.
After many twists and turns, the reporter finally heard that this statement was made by a sports full-time scientific researcher named Bai Wenfei of the Institute of Basic Education of the Beijing Academy of Educational Sciences. When the reporter dialed the phone, the other party said, "White teacher is not here, we are the research department, very busy, you reporters don't look for it here" hurriedly hang up the phone. In the following days, the reporter made the call continuously and got the same answer. The reporter turned around and went to the “Environmental Monitoring and Confirmation Agency” mentioned by the White Expert – China Indoor Decoration Association Indoor Environmental Monitoring Center. Song Guangsheng, director of the center, said in an interview with reporters that the situation disclosed by sports experts is true. The chief culprit in the release of poison gas from plastic track is indeed the toluene diisocyanate substance referred to as TDI in English. According to Song Guangsheng, TDI is a colorless transparent or light yellow liquid used as a curing agent for the manufacture of polyurethane paints and adhesives and polyurethane coatings. In view of the fact that TDI is not only used in plastic runways, but also in the living room, which seriously affects human health, it will be listed as a new indoor pollutant detection project in the future.
The reporter asked if he had done the pollution detection of the plastic track. Director Song also said that the center did not directly test the pollution status of the plastic track. However, the other related products containing TDI have been tested, mainly referring to the national quality inspection. The 10 mandatory national standards issued by the General Administration in 2001, “Limited Quantity of Hazardous Substances in Interior Building Decoration Materials”. This standard sets strict limits on free toluene diisocyanate in solvent-based wood coatings and adhesive products commonly used in interior architectural decoration. In addition, the center has received many reports from the public that the summer is often unpleasantly smelled by the plastic runway of the adjacent school.
Song Guangsheng concluded that TDI is harmful to the human body. TDI is more harmful than formaldehyde and benzene. It not only has strong irritation to skin, eyes and respiratory tract, but also causes bronchitis, allergic asthma, pneumonia and pulmonary edema. After prolonged exposure or inhalation of high concentrations of TDI vapor, the human eye has painful tears and conjunctival congestion; after inhalation of the respiratory tract, there are symptoms such as cough, chest tightness, shortness of breath, asthma, etc.; red pimples and maculopapular rash may occur after skin contact. Contact allergic dermatitis; individual severe cases can also cause pulmonary edema and asthma, causing spontaneous pneumothorax, mediastinal emphysema, subcutaneous emphysema.