1. Harmless under normal use: Polystyrene itself is non-toxic and does not release harmful substances under normal conditions.
2. Release of harmful gases at high temperatures: Combustion or heating may release harmful gases such as styrene, which may lead to poisoning.
3. Food contact risk: High-temperature food may cause polystyrene tableware to release harmful substances.
4. Environmental pollution and occupational hazards: It is not easily degraded and pollutes the environment; long-term occupational exposure may affect workers' health.
