Lab safety rules are a set of practices designed to protect you from chemical burns, infections, fires, and other hazards that exist in any working laboratory. Some are federal requirements enforced by OSHA, while others are standard protocols adopted across educational and professional labs worldwide. Whether you’re entering a chemistry lab, a biology research facility, or a clinical testing environment, the core rules overlap significantly.
Personal Protective Equipment
The most visible safety rule in any lab is wearing the right protective equipment. OSHA requires employers to provide PPE at no cost, and the specific gear depends on the hazards present. At minimum, most labs require safety goggles, gloves, and a lab coat. Closed-toe shoes and clothing that covers exposed skin are standard expectations. The NIH explicitly prohibits sandals, shorts, or any clothing that leaves skin vulnerable to splashes.
Gloves should match the hazard. A single pair of nitrile gloves works for most general chemistry tasks, but higher-risk work (handling infectious specimens or particularly corrosive chemicals) may call for double gloving. Gloves generally have a usable life of about four hours before they should be replaced, even if they appear intact. Face shields and splash guards come into play whenever there’s a risk of liquid splashing toward your face, particularly during procedures that generate aerosols or droplets.
Food, Drinks, and Cosmetics Are Banned
Never eat food, drink beverages, chew gum, apply cosmetics (including lip balm), or handle contact lenses in the laboratory. This rule exists because chemical residues can transfer from surfaces and gloves to anything that touches your mouth, eyes, or skin. Even if your bench looks clean, trace contamination is invisible. Store personal items like water bottles and snacks outside the lab entirely.
Chemical Handling and Labeling
Every container of hazardous chemicals must carry a label with six elements: the product name, a signal word (“Danger” or “Warning”), hazard statements describing the specific risks, precautionary statements covering prevention and emergency response, standardized pictograms, and the manufacturer’s contact information. These requirements come from the Globally Harmonized System (GHS) adopted by OSHA. If you pick up a container and any of that information is missing or illegible, do not use it.
Chemical storage follows strict segregation rules. Flammable materials stay away from heat sources, sparks, and open flames. Oxidizers are kept separate from combustibles. Corrosive chemicals get stored in secondary containment trays that catch leaks. Some reactive chemicals must remain in their original containers to prevent dangerous interactions with incompatible materials. Labels on storage areas should match the hazard class of what’s inside.
Labs that use hazardous chemicals are required by OSHA to maintain a written Chemical Hygiene Plan. This document spells out standard operating procedures, exposure control measures, and training requirements. You should know where your lab’s Chemical Hygiene Plan is kept and what it says about the materials you work with.
Emergency Equipment and Where to Find It
Emergency eyewash stations and safety showers must be reachable within 10 seconds of any location where hazardous chemicals are used. That’s a walking distance rule, not a suggestion. Eyewash stations deliver fluid to both eyes simultaneously at a minimum flow for 15 minutes. Emergency showers supply at least 20 gallons per minute for 15 minutes. Both activate in one second or less, and eyewash stations are designed to stay running hands-free once triggered.
There should be at least 32 inches of clear space around any safety shower and 6 inches around an eyewash station. Keeping these areas unobstructed is everyone’s responsibility. If you notice boxes, equipment, or furniture blocking access, move them or report it immediately.
Know the location of the nearest fire extinguisher before you start working. Labs with flammable liquids typically have dry chemical extinguishers (BC or ABC type). Labs with sensitive electrical equipment like spectrometers use carbon dioxide extinguishers, which don’t leave residue on instruments. Facilities working with flammable metals keep a Class D extinguisher loaded with a graphite-based agent that smothers metal fires. Using the wrong extinguisher type on a fire can make it worse.
Chemical Spill Response
When a spill happens, the first step is to move away from the area before deciding what to do next. Spills fall into two categories: simple and complex. A simple spill doesn’t spread rapidly, doesn’t endanger people beyond direct contact, and doesn’t threaten the surrounding environment. You can typically clean these up yourself using your lab’s spill kit and written spill procedures.
A complex spill requires outside help. If a highly flammable solvent spills near an ignition source, if the quantity is large, or if the chemical poses inhalation risks, evacuate the area and contact emergency responders. Even small spills can create hazards that aren’t immediately obvious. Federal law requires reporting any hazardous substance release that exceeds its reportable quantity to the National Response Center at 800-424-8802. State and local agencies often have their own reporting thresholds.
Every lab should have written spill response procedures posted or easily accessible. These outline who is responsible for what, how to use spill kits, and how to dispose of cleanup residue.
Sharps and Biological Waste Disposal
Needles, scalpel blades, broken glass, and other sharp objects go into puncture-resistant sharps containers positioned right where you’re working. Never recap, bend, or break a used needle by hand. These simple actions account for a large share of needlestick injuries in labs.
Biological waste, including microbiological cultures, blood specimens, and body-fluid samples, goes into leak-resistant biohazard bags. A single sturdy bag is sufficient as long as it isn’t punctured or contaminated on the outside. If the exterior gets contaminated, place the entire bag inside a second biohazard bag and seal both securely. Your lab’s waste disposal procedures will specify whether materials need to be autoclaved before leaving the facility.
Autoclave and Equipment Safety
Autoclaves sterilize materials using high-pressure steam at around 250°F (121°C) and 20 psi. The primary risks are heat burns from the chamber walls, steam burns when opening the door, and scalds from superheated liquids. Never open an autoclave door mid-cycle or when an alarm is sounding.
When a cycle finishes, stand back and crack the door open no more than one inch to release residual steam. Let the load sit in the chamber for 10 minutes before unloading. This allows trapped air to escape from hot liquids and reduces the risk of a hot-bottle explosion. Use insulated thermal gloves to handle anything coming out. Never autoclave sealed containers of liquid, as the pressure buildup can cause them to burst. All lids should be loose or vented.
Biosafety Levels and Access Rules
Biological laboratories operate under a tiered system of biosafety levels (BSL-1 through BSL-4) that dictate increasingly strict rules. In a BSL-1 lab, which handles agents not known to cause disease in healthy adults, standard practices include wearing a lab coat and gloves as needed, washing hands at an available sink, and keeping the lab separated from public areas by doors.
BSL-2 labs handle moderate-risk agents that can cause disease through ingestion or contact with mucous membranes. The added requirements include restricted access during work, mandatory PPE (not just “as needed”), eye protection and face shields when splash risk exists, and the use of a biological safety cabinet for any procedure that could generate aerosols. BSL-2 labs also require self-closing doors, readily available eyewash stations, and access to an autoclave for decontaminating waste before disposal.
General Conduct in the Lab
Beyond the specific rules for chemicals, equipment, and protective gear, a few behavioral standards apply universally. Always know the hazards of the materials you’re working with before you begin. Read Safety Data Sheets for unfamiliar chemicals. Label everything you prepare, including date and contents. Never work alone in a lab when using hazardous materials. Keep your workspace clean and uncluttered, because spills and accidents happen more often on crowded benches. Tie back long hair and avoid loose clothing or dangling jewelry that could catch on equipment or dip into chemicals.
Training is not optional. OSHA requires that employees working with hazardous chemicals receive information and training on the specific hazards in their lab. This training should happen before you start working and whenever new hazards are introduced. If you haven’t been trained on a piece of equipment or a procedure, don’t attempt it.