Lab Risk Classification and Tiered Safety Control System for University Labs

From routine lab tests with ethanol to high-risk operations involving lethal toxic chemicals and radioactive sources, hazard risks vary dramatically across different laboratory settings. To accurately identify, assess, and control diverse lab hazards, educational and research institutions worldwide have gradually established standardized laboratory safety management frameworks. China has also developed a comprehensive tiered risk control system that serves as a practical reference for global lab safety governance.

In March 2024, the Ministry of Education of China officially put into effect the Administrative Measures for Classification and Risk Grading of University Laboratory Safety (Trial), which categorizes university laboratories into four risk grades (Grade Ⅳ, Ⅲ, Ⅱ, Ⅰ) marked with four universal warning colors: Blue, Yellow, Orange, and Red. This tiered management framework aligns with the core requirements of international standards, including OSHA Hazard Communication Standard, UN GHS (Globally Harmonized System of Classification and Labelling of Chemicals), and ISO laboratory safety specifications. Meanwhile, China has formulated localized industrial standards such as GB 45673-2025 and DB31/T 1564-2025 as implementation guidelines for hazardous chemical management. This article elaborates on the core logic of four-tier lab risk classification and actionable management rules to help lab administrators build targeted safety protocols.

1. Core Criteria for Laboratory Risk Grading

Lab risk grading centers on hazard source evaluation and follows the internationally recognized "highest-risk priority principle": where multiple hazard sources exist in a single lab, the lab’s overall grade is determined by the most dangerous substance or equipment onsite.
Risk assessment is conducted from two key dimensions in line with global hazard classification practices:

1. Types of hazard sources: five mainstream categories globally, namely chemical hazards (lab reagents, compressed industrial gases), biological hazards (pathogens and biological specimens), radiological hazards (radioactive materials, radiation-emitting equipment), electromechanical hazards (high-pressure containers, high-speed rotating machinery), plus other physical hazards.

1. Storage quantity and inherent risks: comprehensive evaluation based on chemical storage volume, intrinsic hazardous properties (toxicity, flammability, corrosivity, and explosiveness), as well as extreme operating conditions such as high temperature, high pressure, and oxygen-deficient environments.

For example, regular lab ethanol and highly toxic potassium cyanide will fall under completely different risk grades even if stored within the same laboratory building.

2. Detailed Safety Specifications for Four Color-Coded Laboratory Grades

Grade Ⅳ (Blue Label: Low-Risk General Laboratory)

Core Hazard Sources

Common non-hazardous chemicals (ethanol, sodium chloride), inert gas such as nitrogen (max. 4 gas cylinders per single room); no high-temperature/high-pressure equipment, radioactive materials, or harmful biological samples.

Classification Standards

1. Only non-flammable, non-toxic, and non-corrosive conventional chemicals are used;
2. Total stock of hazardous chemicals ≤100L (or 100kg), among which flammable chemicals account for no more than 50L (or 50kg);
3. No radioactive sources, pathogenic biological samples, high-pressure, or high-speed mechanical equipment present.

Mandatory Safety Requirements (referencing ISO 17025 and Chinese domestic standards)

1. No strict entry certification required; students can access the lab after completing basic safety training.
2. Standard commercial reagent cabinets that meet GHS storage requirements are acceptable for chemical containment.
3. Basic PPE (nitrile gloves, safety goggles) and emergency safety showers shall be installed per international lab construction codes.

Grade Ⅲ (Yellow Label: Medium-Low Risk Lab with Regular Hazardous Chemicals)

Core Hazard Sources

Moderate-risk chemicals (sulfuric acid, sodium hydroxide), combustible gases like methane, non-pathogenic microbial samples, and low-voltage electrical devices.

Classification Standards

1. Labs involve corrosive, flammable, or moderately toxic chemicals, excluding highly toxic or explosive precursors regulated under UN GHS and international precursor control conventions;
2. Total hazardous chemical inventory ≤500L (or 500kg), and the total volume of combustible gas cylinders ≤0.24m³ (equivalent to around six standard 40L cylinders);
3. Only low-temperature and low-pressure routine experiments are performed without critical major hazard installations.

Mandatory Safety Requirements

1. All lab personnel must pass specialized safety training and relevant assessments before gaining lab access.
2. Cabinets for flammable reagents shall have a minimum fire resistance of 30 minutes, complying with NFPA codes and China’s local standard DB31/T 1564-2025;
3. Enclosed labs must be equipped with mechanical ventilation, ensuring an air exchange rate of no less than 3 times per hour;
4. A detailed reagent inventory log shall be maintained, and dual-person verification is required for all reagent collection procedures.

Grade Ⅱ (Orange Label: Medium-High Risk Restricted Laboratory)

Core Hazard Sources

Explosive precursor chemicals (ammonium nitrate, potassium permanganate), toxic gases such as chlorine, pathogenic microbial samples, high-pressure equipment (≥0.1MPa), and high-speed rotating machinery (≥3000 RPM).

Classification Standards

1. Storage or usage of explosive precursors, Class Ⅱ & Ⅲ controlled precursor chemicals, or toxic industrial gases listed in UN dangerous goods regulations;
2. Total volume of flammable chemicals ≤200L (or 200kg), with single package limit ≤25L for general liquids and ≤5L for flammable liquids;
3. Experimental operations are carried out under high-temperature, high-pressure, or oxygen-deficient environments or involve infectious biological specimens.

Mandatory Safety Requirements

1. Strict access licensing is enforced; only trained and certified staff are permitted entry.
2. Lab entrances are fitted with Class A/B fire doors, and lab spaces are separated from adjacent areas via partition walls and floor slabs with at least 1.5-hour fire endurance.
3. Toxic gas detectors, explosion-proof electrical fittings, and 24-hour CCTV monitoring are installed at all high-risk locations.
4. Site-specific emergency response plans shall be formulated, with full emergency drills held at least twice a year as required by OSHA emergency management provisions.

Grade Ⅰ (Red Label: Highest-Risk Strictly Controlled Laboratory)

Core Hazard Sources

Acute highly toxic chemicals (sodium cyanide, anhydrous hydrofluoric acid), explosive substances, radioactive isotopes, highly pathogenic microorganisms, and major hazard installations exceeding internationally defined threshold quantities (refer to China’s GB 18218 for major hazard identification).

Classification Standards

1. Labs contain regulated lethal poisons, explosives, Class Ⅰ precursor chemicals, or radioactive materials;
2. Total hazardous chemical storage ≥2 tons, or over 60% of the major hazard threshold specified by international norms and GB 18218;
3. High-risk experimental processes or highly pathogenic bio-agents are involved, where operational errors may lead to catastrophic mass casualties.

Mandatory Safety Requirements

1. Dual-key lock management plus multi-level authorization: lab entry requires approval from institutional supervisors and authorization from the lab principal;
2. Labs must be built alongside exterior building walls and fully separated from other functional zones by fire barrier walls with a minimum 4-hour fire resistance rating; an independent ventilation system delivering ≥12 air changes per hour is mandatory.
3. Real-time online hazard monitoring systems are connected to the campus safety management platform to trigger automatic alerts for abnormal conditions.
4. Such labs need to file records with competent educational authorities and receive no fewer than two official safety inspections annually; all experiments must be suspended until critical safety hazards are fully rectified.
5. All operators must hold valid specialized operation certificates and receive regular occupational health examinations per global occupational safety standards.

3. General Management Principles for All Lab Risk Grades

Laboratories of all four grades shall develop customized Standard Operating Procedures (SOPs) matching their respective risk levels. Safety regulators across the globe widely adopt the management principle of prioritizing high-risk control while achieving full-site coverage, to allocate sufficient funding for safety infrastructure and conduct regular safety inspections to eliminate potential lab risks from the source.

4. Digital Platform for Laboratory Risk Assessment and Classification

Digital grading and assessment platforms have been widely adopted globally for streamlined lab safety management. Designed in accordance with international laboratory safety standards alongside China’s university lab grading policies, these platforms automatically identify onsite hazard types, calculate overall lab risk levels via built-in algorithms, and generate customized hazard prevention solutions, greatly boosting the accuracy and efficiency of daily lab safety administration.

5. Correction of Common Misconceptions About Lab Risk Classification

Myth 1: Small chemical stock equals low safety risk → Incorrect

A lab’s risk grade is determined by the inherent hazard of chemicals instead of storage volume. Even 100mL of highly toxic sodium cyanide onsite will classify the entire lab as Grade Ⅰ (Red), subject to the strictest set of high-risk control protocols.

Myth 2: A Blue warning label means no follow-up safety management needed → Incorrect

Improper practices, including incompatible mixing of acids and bases or unauthorized electrical wiring, can instantly turn a low-risk Blue-grade lab into a high-risk environment. Dynamic regular risk reassessment is essential to correct unsafe operations promptly.

Myth 3: Lab grading is solely management’s responsibility; lab students bear no safety obligations → Incorrect

All personnel accessing labs of any risk tier must comply with corresponding safety codes, complete required safety training, and follow standardized operating procedures. Operators are legally accountable for safety incidents arising from improper manipulation under global occupational safety legislation.

Conclusion

From common lab ethanol to highly regulated lethal toxicants, from basic low-voltage circuits to shielded radioactive experimental facilities, every color-coded warning sign outside a laboratory embodies refined and standardized global lab safety management. This tiered grading system reminds researchers worldwide to recognize hidden hazards, abide by operational specifications, and put experimental safety above everything else.

Supplementary Introduction of Corrosion-Resistant Chemical Storage Cabinets

As critical hardware for hazardous chemical containment across all tiered labs, PP (Polypropylene) corrosion-resistant storage cabinets are compliant storage solutions for corrosive acids, alkalis, and organic solvents, satisfying the storage requirements of Grade Ⅰ, Ⅱ, and Ⅲ laboratories while meeting OSHA, GHS, and relevant domestic safety regulations. Manufactured with integrally molded high-density polypropylene, these cabinets feature outstanding anti-corrosion performance, leak-proof seamless construction, and adjustable inner shelves. Available in multiple specifications ranging from 4-gallon to 90-gallon capacities, they effectively mitigate risks such as reagent leakage, cabinet corrosion, and cross-contamination, serving as essential equipment to implement tier-based lab safety management.

Reference link: https://labworkbenchs.com/lab-furniture/corrosion-resistant-polypropylene-pp-storage-cabinet/