2. Strong oxidizing chemical reagents: Any chemical reagents that come into contact with the skin, mucous membranes, eyes, and respiratory organs should be cleaned in a timely manner, especially those that are corrosive to the skin, mucous membranes, eyes, and respiratory organs, such as various acids and bases.

3. Flammable reagents in contact with water: These types of chemical reagents include potassium, sodium, lithium, calcium, calcium carbide, etc. They can undergo intense reactions and release a large amount of heat when in contact with water, and can also burn. When using, avoid direct contact with water or the human body to prevent skin burns.

4. Toxic chemical reagents: Generally, chemical reagents are toxic to the human body, so it is important to avoid inhaling large amounts when using them; After using the performance reagents, it is necessary to wash hands, face and take a shower in a timely manner, change work clothes, and avoid inhaling or ingesting small amounts of chemical reagents that can cause poisoning and death, such as sulfuric acid, dimethyl ester, etc. When using these reagents, it is necessary to understand the emergency treatment methods for poisoning. Highly toxic reagents must be kept by a dedicated person and the usage amount must be strictly controlled.

5. Radioactive chemical reagents: When using such chemical reagents, protective measures must be taken according to the method of using radioactive substances. Other types of hazardous chemical reagents, whether commonly used or not, must be understood for their safety precautions before use.