Laboratory Safety Rules: A Practical Guide for Research Labs

Every research lab runs on the same handful of safety rules, whether the hazard on the bench is a corrosive acid, a BSL-2 pathogen, or a dewar of liquid nitrogen. This guide is the orientation point: it lays out the general rules every lab should enforce and links out to CASRAI’s detailed guides on each specific hazard, procedure, and OSHA requirement, so you can go deeper on exactly the situation you’re dealing with.

Before You Start

Most lab injuries trace back to a skipped step before the work even began, not a freak accident during it.

• Training and documentation come first. Nobody should touch a hazardous chemical, biological agent, or piece of equipment without documented, hazard-specific training — general lab safety orientation plus training on the specific procedure. See Chemical Hygiene Plan Training: What OSHA Requires Labs to Provide Employees and Bloodborne Pathogens Training for Research Personnel.
• Read the SOP and risk assessment before you start, not after something goes wrong. A written standard operating procedure and a hazard/risk assessment should exist for any non-routine or high-hazard procedure. See How to Write a Lab SOP.
• Know where the safety equipment is before you need it. Eyewash station, safety shower, spill kit, fire extinguisher, and nearest exit locations should be second nature, not something you look for during an incident.
• Never work alone on a hazardous procedure. Many institutional chemical hygiene plans and biosafety programs specifically restrict or prohibit solo work with acutely hazardous materials, BSL-2+ agents, or after-hours high-risk work — check your institution’s policy.

The Hierarchy of Controls, and Where PPE Fits

Personal protective equipment is the last line of defense, not the first. Occupational safety practice (the framework NIOSH and OSHA both use) ranks controls from most to least effective: elimination of the hazard, substitution with something less hazardous, engineering controls (fume hoods, biosafety cabinets, machine guarding), administrative controls (procedures, scheduling, signage, training), and finally PPE. PPE is required precisely because the hazards that reach the researcher are the ones the earlier controls couldn’t fully remove — treating it as the primary defense, rather than the backstop, is a common and dangerous shortcut.

Minimum PPE in a chemical or biological lab typically includes:

• Eye protection — safety glasses at minimum, chemical splash goggles or a face shield for splash-risk procedures.
• A buttoned, closed lab coat, removed before leaving the lab and never worn into break rooms or offices.
• Gloves selected for the specific hazard. No single glove material resists every chemical — see Chemical-Resistant Glove Selection Guide for matching material to hazard.
• Closed-toe, closed-heel footwear — no sandals or perforated shoes.
• A respirator only when engineering controls (ventilation, fume hood) can’t keep airborne exposure below acceptable limits, and only after fit-testing and medical clearance under a respiratory protection program.

For a fuller walkthrough of selecting and combining PPE for chemical work, see PPE Selection for Chemical Handling in the Lab.

General Lab Conduct

• No food, drink, gum, or cosmetics application anywhere hazardous materials are used or stored — this includes not storing food in a lab refrigerator used for samples or reagents.
• Never mouth-pipette. Use mechanical pipetting aids exclusively.
• Tie back long hair and secure loose clothing/jewelry around open flames, moving equipment, or centrifuges.
• Keep the bench clear and label every container with contents, hazard, and date — an unlabeled container is a hazard the next person can’t assess.
• Never leave an unattended reaction or heat source running without a documented risk assessment and a way for others to identify it and shut it down (signage, timer, or remote monitoring).
• Practice good housekeeping: keep aisles and emergency equipment access clear, and clean up as you go rather than at the end of a long procedure.

Chemical Safety

Chemical safety in the lab rests on knowing what you’re working with and keeping incompatible materials apart.

• Know the hazard before you open the bottle. Every hazardous chemical has a Safety Data Sheet (SDS) that must be accessible to anyone working with it — see How to Read a Safety Data Sheet (SDS) and Common Lab Chemical Hazard Classes Explained.
• Read the label. GHS pictograms, signal words, and hazard statements are designed to be understood at a glance — see Understanding GHS Labels and Secondary Container Labeling: OSHA HazCom Rules.
• Segregate incompatible materials. Acids and bases, oxidizers and flammables, and water-reactive compounds must be stored apart — see Chemical Storage Compatibility: Segregation Rules, Flammable Liquid Storage Cabinet Requirements, and Reactive Chemicals: Water-Reactive and Pyrophoric Compound Handling. Peroxide-forming chemicals need their own testing and disposal timeline — see Peroxide-Forming Chemicals.
• Use the fume hood correctly. Work at least six inches inside the hood, keep the sash at or below its certified operating height, and never use a hood as chemical storage — see Fume Hood Sash Height and Safe Operating Practices and Chemical Fume Hood Certification and Inspection.
• Know your waste streams. Hazardous chemical waste cannot go down the drain or in the regular trash — see Lab Waste Disposal: RCRA Streams, Generator Status, and Disposal Routes.
• A subset of chemicals — select carcinogens, reproductive toxins, and substances of high acute toxicity — carry extra handling and approval requirements; see Particularly Hazardous Substances in the Lab.

Biological Safety

Biological work is tiered by risk group and biosafety level (BSL), and the containment practices scale with it.

• Understand which Biosafety Level (BSL) applies to your work — see the individual level pages for BSL-1, BSL-2, BSL-3, and BSL-4, and the reference framework in BMBL.
• Use the biosafety cabinet correctly — it protects the researcher, the sample, and the environment simultaneously, but only when certified and operated correctly. See Biosafety Cabinet Certification: NSF/ANSI 49 and Biosafety Cabinet Cleaning and Decontamination Procedures.
• Decontaminate surfaces, equipment, and waste using a disinfectant validated against the organisms in use, and autoclave biological waste per your institution’s protocol — see Autoclave Operating Safety and Autoclave Validation: Biological and Chemical Indicators.
• Handle sharps as a dedicated hazard category. Never recap needles by hand, use puncture-resistant sharps containers, and know the first-hour response to an exposure — see Needlestick Injury Response: The First-Hour Protocol and Bloodborne Pathogens Training for Research Personnel.
• Work involving recombinant/synthetic nucleic acids or human/animal pathogens is typically overseen by your Institutional Biosafety Committee (IBC), with a Biosafety Officer (BSO) as the day-to-day point of contact.

Physical Hazards

Physical hazards get less attention than chemical and biological ones, but the injuries can be just as severe.

• Compressed gas cylinders must be secured upright, capped when not in use, and never dragged or rolled — an unsecured cylinder with a sheared valve becomes an unguided projectile.
• Cryogens (liquid nitrogen, dry ice) pose both cold-contact burn and oxygen-displacement/asphyxiation risk in enclosed spaces — see Liquid Nitrogen and Cryogen Handling.
• Lasers are classified by output power and hazard (Class 1 through Class 4), with different eyewear and control requirements at each level — see Laser Safety Classes Explained.
• Autoclaves combine high pressure, high temperature, and steam — see Autoclave Operating Safety: Avoiding Steam Burns, How to Operate a Lab Autoclave, and Autoclave Troubleshooting.
• Centrifuges must be balanced and run within their rated speed — see RCF vs. RPM: How to Convert and Why It Matters.
• Electrical equipment near water or wet work requires GFCI protection and routine inspection for damaged cords and housings.

Emergency Response

• Spills — know your spill kit and the escalation point between a routine cleanup and calling EHS. See Chemical Spill Kits: What to Stock and How to Respond.
• Eyewash and safety shower use. ANSI/ISEA Z358.1 — the consensus standard OSHA points to when enforcing its own general “suitable facilities” requirement at 29 CFR 1910.151(c) — calls for a minimum 15-minute continuous flush with tepid water, reachable within about 10 seconds. See Eyewash Station and Safety Shower Requirements.
• Fire extinguishers are classed by fuel type — Class A (ordinary combustibles), B (flammable liquids), C (energized electrical), D (combustible metals, which require a special dry-powder agent — water and standard extinguishers make a metal fire worse), and K (cooking oils). Use the wrong class and you can spread the fire instead of stopping it.
• Evacuation — know your lab’s assembly point and the specific shutdown steps (gas valves, equipment) required before leaving, if it’s safe to perform them.
• Report incidents — and near misses. A near miss (an event that could have caused harm but didn’t) is the single hardest thing to get researchers to report, because nothing visibly went wrong. It’s also the most valuable data a safety program gets: it identifies a failure point before it produces an actual injury. Institutional policy should make near-miss reporting blame-free and genuinely routine, not exceptional.
• Needlestick and other sharps exposures have their own time-sensitive first-aid and reporting sequence — see Needlestick Injury Response: The First-Hour Protocol.

The Compliance Layer CASRAI Owns

Lab safety rules aren’t just good practice — for chemical hazards specifically, they’re a federal requirement. OSHA’s Laboratory Standard, 29 CFR 1910.1450 (“Occupational Exposure to Hazardous Chemicals in Laboratories”), requires any employer where laboratory use of hazardous chemicals occurs to develop and maintain a written Chemical Hygiene Plan (CHP). At minimum, a compliant CHP has to spell out standard operating procedures relevant to health and safety for each hazardous-chemical activity, the criteria the employer will use to select and implement exposure controls (engineering controls, PPE, and hygiene practices), and a schedule for reviewing and updating the plan — at least annually. See How to Write and Maintain a Chemical Hygiene Plan, Chemical Hygiene Plan Training: What OSHA Requires, and the reference entry at Laboratory Safety (OSHA Chemical Hygiene Plan).

In practice, this compliance layer is administered institutionally, not by individual PIs alone:

• Your institution’s Environmental Health and Safety (EHS) office owns the CHP program, chemical inventory oversight, waste pickup, and most safety training delivery.
• Biological work with recombinant/synthetic nucleic acids or infectious agents adds oversight from the Institutional Biosafety Committee (IBC); work involving live vertebrate animals adds an IACUC layer.
• Inspection readiness is a year-round posture, not a pre-visit scramble: current SDS access, correctly labeled and segregated chemicals, up-to-date training records, functioning and dated-inspection eyewash/showers and fume hoods, and a CHP that actually reflects what the lab does (not a generic template) are what an OSHA compliance officer or institutional EHS auditor will check first.

For the facility-design side of this compliance layer, see Laboratory Design for Compliance and Safety.

Frequently Asked Questions

What is the single most important lab safety rule?

There isn’t one rule that covers every lab, but the closest thing to a universal principle is: know the hazard before you start, and control it in the order elimination, substitution, engineering controls, administrative controls, PPE — never reach for PPE as the only safeguard.

What are the basic lab safety rules everyone should follow?

No food or drink in hazard areas, no mouth pipetting, appropriate PPE (eye protection, closed-toe shoes, lab coat, chemical-appropriate gloves), labeled containers, accessible SDSs, knowledge of eyewash/shower/spill-kit locations, and mandatory reporting of incidents and near misses.

Why is near-miss reporting considered so important, if nothing actually happened?

A near miss is a free look at a failure point before it causes an injury. Safety programs that only track actual injuries are working from data that already cost someone harm; near-miss reporting catches the same underlying problem earlier, which is why it’s treated as a leading indicator rather than an afterthought.

Do lab safety rules differ between a chemistry lab and a biology lab?

The general conduct rules (no food/drink, labeled containers, PPE, reporting) are the same. The specific technical controls differ: chemical labs center on the Chemical Hygiene Plan, GHS labeling, and fume hood use; biological labs center on biosafety level, biosafety cabinet use, and decontamination/sharps protocols. Most research labs need both sets.

Who is responsible for enforcing lab safety rules?

Responsibility is shared and overlapping by design: the Principal Investigator/lab manager for day-to-day enforcement and lab-specific SOPs, the institutional EHS office for the Chemical Hygiene Plan program and training, the IBC for biological oversight, and OSHA as the federal regulator whose Laboratory Standard (29 CFR 1910.1450) sets the compliance floor.