Ps is a kind of polystyrene plastic, which is harmful to human body. According to relevant public information, PS material is harmful to human body because it contains benzene, a toxic and harmful chemical. Long-term exposure to benzene will cause harm to human body, such as headache, dizziness, nausea, vomiting, skin irritation and other symptoms, even damage to human nervous system, immune system, hematopoietic system and even cancer.