When handling hazardous materials, you should always identify the substance first, wear the correct protective equipment, and follow established procedures for storage, use, and disposal. These aren’t suggestions. Federal law requires employers to train workers, label every container, and provide safety equipment before anyone touches a hazardous chemical. Here’s what that looks like in practice.
Read the Label and Safety Data Sheet First
Every container of hazardous chemicals must carry six pieces of information: a product identifier (the chemical’s name), a signal word (“Danger” for severe hazards or “Warning” for less severe ones), hazard statements describing the specific risks, precautionary statements telling you how to minimize those risks, pictograms showing the hazard type at a glance, and the manufacturer’s name, address, and phone number.
Beyond the label, every hazardous chemical comes with a Safety Data Sheet (SDS), a standardized 16-section document that covers everything from the chemical’s physical properties to first aid measures, fire-fighting instructions, and recommended protective equipment. Your employer is required to keep these accessible. Before you handle any chemical you haven’t worked with before, read at least the hazard identification, handling and storage, and exposure control sections of its SDS. This tells you exactly what the substance can do to you and how to protect yourself.
Wear the Right Protective Equipment
Not all gloves protect against all chemicals. A nitrile glove that works fine for phosphoric acid will dissolve within hours if exposed to acetone. The National Institute for Occupational Safety and Health publishes chemical resistance ratings for different barrier materials, measured by how many hours they resist breakthrough. Butyl rubber gloves, for example, provide over eight hours of protection against ammonia, acetaldehyde, and sulfuric acid. But for benzene, you’d need polyvinyl alcohol gloves instead, because butyl rubber won’t hold up.
The same principle applies to every piece of gear. Eye protection ranges from basic splash goggles to full face shields depending on whether you’re handling a corrosive liquid or a volatile solvent. Respiratory protection varies from simple filtering masks to supplied-air respirators. Your SDS will specify what’s needed. The key rule: never substitute one type of protection for another based on convenience. A latex glove is not “close enough” to a butyl rubber glove.
Know How Chemicals Enter Your Body
Hazardous materials reach you through three main routes: inhalation, skin or eye contact, and ingestion. Inhalation is the most common exposure path in workplaces because vapors, dust, and fumes travel through air that you’re already breathing. Skin contact is the second most frequent, and many chemicals absorb directly through intact skin without causing any immediate sensation.
Early symptoms of chemical exposure include eye irritation and tearing, a burning feeling in the skin, nose, or throat, coughing, dizziness, and headache. These signs mean you’ve already been exposed. If you notice any of them, move away from the source immediately and begin decontamination. Don’t wait to see if symptoms get worse.
Store Chemicals by Compatibility, Not Alphabetically
Improper storage causes some of the most dangerous incidents in workplaces. The core rule is straightforward: never store chemicals from different compatibility groups together. Acids and bases stored side by side can produce violent reactions if containers leak. Mixing a strong acid like concentrated sulfuric acid with a strong base like concentrated sodium hydroxide generates extreme heat and can cause a liquid explosion.
Several other storage rules matter just as much:
- Liquids and dry chemicals should never share storage space, regardless of their compatibility group.
- Oxidizing powders kept near carbon-based powders can generate enough heat to cause an explosion or fire.
- Compressed gases each need their own separate storage and feed area. Chlorine and ammonia, specifically, must be stored apart from each other and from all other chemical groups.
- Everyday products like paint, fuel, oil, antifreeze, and cleaning solvents should never be stored alongside process chemicals.
All chemical storage areas should be secure, well-ventilated, and free of moisture, excessive heat, and ignition sources.
Know Where Emergency Equipment Is
Federal regulations require that wherever workers may be exposed to corrosive materials, emergency eyewash stations and drench showers must be available within the immediate work area for instant use. “Immediate” is the key word. You won’t have time to walk down a hallway or search for a key if concentrated acid splashes your face.
Before you start any task involving hazardous materials, confirm the location of the nearest eyewash station, emergency shower, fire extinguisher, and spill kit. Test eyewash stations regularly to make sure they’re flowing. Know the location of the nearest exit. This takes 60 seconds and can prevent permanent injury.
Responding to a Spill
If a hazardous material spill occurs, the priority sequence is: protect people first, contain the spill, then report it. Start by helping anyone who has been splashed or contaminated to safety showers and eyewash stations. Once they’re decontaminating, confine the spill by closing doors to the affected area, covering floor drains to prevent chemicals from reaching the environment, and keeping contaminated people from spreading the substance to clean areas.
Report the spill immediately to your site’s emergency response office or supervisor. Provide the type of material spilled, the estimated quantity, the location, and whether anyone is injured. Then secure the area by stationing people at every entrance to keep others from walking into the contamination zone. Do not attempt cleanup yourself unless you have the specific training, protective equipment, and cleanup materials for that chemical. Unqualified cleanup attempts are one of the most common ways spills turn into injuries.
Get the Right Level of Training
Federal HAZWOPER (Hazardous Waste Operations and Emergency Response) standards require different training levels depending on your role. Workers who may be exposed to hazardous substances at cleanup sites or emergency responses need 24 or 40 hours of initial training. Workers in more limited roles may need 8 hours. All levels require an 8-hour refresher course every 12 months. If more than 12 months pass without a refresher, you’ll need to address that gap before resuming hazardous material work.
Training must result in a written certificate specifying your level of certification. Keep this document. Employers are responsible for providing and documenting this training, but you’re responsible for knowing whether yours is current.
Handle Waste With the Same Care as Fresh Chemicals
Hazardous waste doesn’t become less dangerous because you’re done using it. Waste containers must meet Department of Transportation specifications and carry proper labeling and markings. During transport, waste must be accompanied by a manifest, a tracking document that follows the material from your facility to its final disposal site.
At transfer points, hazardous waste can be held in containers for no more than 10 days without triggering full storage facility requirements. If your workplace accumulates hazardous waste, containers should be sealed when not actively adding waste, labeled with the words “Hazardous Waste” and the date accumulation began, and stored following the same compatibility and ventilation rules that apply to fresh chemicals. Leaving waste containers open, unlabeled, or sitting past their accumulation deadline creates both legal liability and genuine safety risk.