In warehouse management, for safety, compliance, and risk control reasons, the following types of items are usually strictly prohibited or restricted from storage. These regulations aim to prevent accidents such as fires, explosions, poisoning, and environmental pollution, and to ensure the health and safety of personnel and property:

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I. Flammable and Explosive Goods

✅ Typical examples: gasoline, alcohol, paint thinner, lighter gas, fireworks, explosive raw materials (such as ammonium nitrate), lithium battery packs (large capacity), gas cylinders, etc.
⚠️ Risk points: Extremely easy to cause violent combustion or even explosion due to static electricity, high temperature, or open flames, damaging building structures and endangering lives.
📜 Legal basis: The "Regulations on the Safe Management of Hazardous Chemicals" and the "Fire Prevention Regulations for Building Design" (GB50016) require that Class A/B hazardous goods must be stored in special hazardous chemical warehouses, equipped with explosion-proof facilities and monitoring systems.

> 📌 Exceptions: If an enterprise has special qualifications and approval from the safety supervision department, it can be stored in isolation in a designated area, but it must meet strict conditions such as ventilation, spacing, and fire extinguishing devices.

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II. Highly Corrosive Substances

✅ Common types: concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, industrial alkaline solutions (NaOH solution), etching solutions, etc.
⚠️ Hazard mechanism: Volatile droplets damage the respiratory mucosa; rapid corrosion of concrete floors and metal shelves upon leakage; contact with other chemicals may cause violent reactions, generating heat or toxic gases.
🔧 Protective measures: Even if storage is allowed, a double-layer leak-proof tray + neutralization emergency treatment pool design must be used; ordinary warehouses have absolutely no load-bearing capacity.

III. Highly Toxic Chemicals and Biological Agents

✅ Scope includes: cyanide salts, arsenic compounds, organophosphorus pesticide concentrates, botulinum toxin samples, highly pathogenic virus strains, etc.
⛔️ Core principle: Such items must be stored in safes registered with the public security organs, under dual-person and dual-lock management, with the entire process of collection and use recorded for traceability. 99% of conventional warehouses do not have the qualifications for storage.
🔬 Research scenario reminder: If key university laboratories temporarily store a small amount of experimental samples, they need to apply to the Public Security Bureau for a "Purchase License for Highly Toxic Chemicals" and cooperate with a professional security company for monitoring.

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IV. Radioactive Substances and Related Equipment

✅ Typical representatives: Cobalt-60 radiation sources, waste medical radiotherapy equipment parts, uranium ore specimens, etc.
🚫 Statutory prohibition: According to the "Regulations on the Safety and Protection of Radioactive Isotopes and Radiation Devices", all radioactive materials must be stored in lead shielding rooms and clearly marked with warning signs; ordinary warehouses have no right to handle them. Illegal storage will result in criminal liability.
💡 Extended case: A company mistakenly stored waste instruments containing trace amounts of thorium in an ordinary warehouse, resulting in a three-fold increase in the radiation level of the surrounding environment, and was eventually ordered to suspend operations and fined over one million.

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V. Illegal and Prohibited Items (Legal Red Line)

| Category | Specific Examples | Legal Consequences |
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| Controlled knives | Daggers, three-edged scrapers | Detention + fine under the "Public Security Administration Punishment Law" |
| Simulated weapons | Model guns, stun guns | Confiscation and criminal prosecution |
| Smuggled goods | Untaxed luxury handbags | Constitutes smuggling, with a maximum sentence of life imprisonment |
| Counterfeit and substandard products | Private label cosmetics, counterfeit drugs | Destruction of goods + revocation of business license |

> ❗ Special note: Cross-border warehousing enterprises should be particularly vigilant against the smuggling of goods; customs will regularly check the consistency of bonded warehouse inventories and physical goods.

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VI. Expired or Spoiled Food/Drugs

✅ High-risk subcategories: Expiring infant formula, insulin injection, blood products, experimental animal carcasses, etc.
🕳️ Potential crisis: Microbial growth leading to infection risks; protein denaturation producing toxins; cold chain failure leading to explosive growth of bacteria. Even unopened products may become ineffective due to fluctuations in storage environment.
🏥 Medical industry standards: GSP certification requires that the temperature error of pharmaceutical cold storage be ≤ ±2℃, humidity be constant at 45%~75%, and manual verification records be required twice a day.

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VII. Contaminated Waste Materials
▶️ Solid waste
- PCB capacitor waste (containing polychlorinated biphenyls)
- Asbestos insulation removal debris
- Mercury lamp tube broken residue

▶️ Liquid waste
- Electroplating tank waste liquid (containing heavy metals chromium, nickel)
- Developing and fixing waste liquid (silver ion concentration exceeding the standard)
- Laboratory organic solvent wash bottle water

🌱 Environmental regulations: The "Law on the Prevention and Control of Environmental Pollution by Solid Waste" stipulates a system for transfer slips for hazardous waste, tracking it from generation to disposal, prohibiting mixing with ordinary garbage for disposal.

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VIII. Other Special Controlled Materials
🌿 Plant-derived risk items
- Dried cannabis flowers and leaves (controlled even if CBD content is low)
- Crudely processed coca leaves
- Seeds of invasive alien species that have not been inactivated

⚡️ High-voltage equipment components
- Lightning arrester components removed from substations (residual charge can reach several kilovolts)
- X-ray machine tube assembly
- Superconducting magnet transport module of an MRI

💨 Compressed gas cylinder assembly
- Simultaneous stacking of oxygen cylinders and acetylene cylinders (prohibited mixed storage!)
- Expired CO₂ fire extinguisher cylinders (internal corrosion leading to explosion risk)
- Nitrous oxide (N₂O) recreational abuse filling canisters

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Alternative Solution Suggestions

When facing the storage needs of the above items, it is recommended to adopt the following legal paths:  
1️⃣ Rent a professional warehouse: Choose a third-party hazardous chemical logistics center with the corresponding qualifications;  
2️⃣ Technical transformation and upgrading: Carry out explosion-proof transformation of existing warehouses (such as installing combustible gas detection systems);  
3️⃣ Process optimization and separation: Outsource high-risk processes to certified suppliers for management;  
4️⃣ Digital tracking: Use RFID tags to achieve full life cycle traceability and supervision.