Physical Hazard: Meaning, Examples, WHMIS Classes, and Workplace Controls
Quick Overview
A physical hazard is anything in the workplace environment, equipment, materials, or work process that can physically harm a worker. Physical hazards may cause injuries through falls, impact, noise, heat, cold, pressure, fire, electricity, moving equipment, radiation, or unsafe site conditions.
In workplace safety, the term physical hazards can refer to everyday jobsite risks like slippery floors, poor lighting, moving machinery, or working at heights. In WHMIS, physical hazards have a more specific meaning. They refer to hazardous products with physical or chemical properties such as flammability, reactivity, gases under pressure, corrosivity to metals, or explosive behaviour.
For employers in British Columbia and Western Canada, identifying physical hazards is one of the first steps in building a strong safety program. WorkSafeBC explains that hazard identification starts with workplace inspections, observing tasks, assessing equipment, and reviewing how work areas are designed and used. GreenSpine Safety helps employers turn that process into practical hazard assessments, safe work procedures, training systems, and safety documentation that workers can actually use.
What Is a Physical Hazard?
A physical hazard is a source of potential harm caused by the physical conditions of the workplace or by the physical properties of materials, tools, substances, equipment, or work activities.
Simple examples include:
Slippery surfaces
Falling objects
Loud noise
Extreme heat or cold
Working at heights
Moving machinery
Poor lighting
Electrical energy
Pressurized systems
Vehicle and mobile equipment movement
Fire and explosion risks
The key point is that a physical hazard can cause harm even without toxic exposure or infection. A wet floor can cause a fall. A loud machine can damage hearing. A rotating blade can cause injury. A pressurized container can rupture. A hot surface can burn. A poorly planned work area can create struck-by, caught-between, or trip hazards.
Physical hazards can exist in almost every industry, including construction, manufacturing, landscaping, forestry, agriculture, warehousing, transportation, healthcare, hospitality, and office environments.
Physical Hazard vs. Other Types of Workplace Hazards
Physical hazards are only one category of workplace hazard. Many employers also need to consider chemical, biological, ergonomic, psychological, and safety management hazards.
A workplace inspection should look at all of these categories together. For example, a worker using a cleaning chemical may face a chemical exposure hazard, but also a physical hazard if the area is slippery, poorly ventilated, or cluttered.
Here is a simple comparison table:
| Hazard Category | What It Means | Examples |
|---|---|---|
| Physical hazards | Hazards caused by workplace conditions, equipment, energy, or the work environment. | Slips, falls, moving equipment, noise, heat, electricity, falling objects |
| Chemical hazards | Hazards created by exposure to hazardous products, gases, vapours, dusts, liquids, or fumes. | Solvents, cleaning products, welding fumes, silica dust, acids |
| Biological hazards | Hazards involving living organisms or biological materials that can cause illness or infection. | Bacteria, viruses, mould, bodily fluids, animal waste |
| Ergonomic hazards | Hazards caused by poor workstation setup, repetition, force, awkward posture, or manual handling. | Heavy lifting, repetitive tasks, awkward reaching, poor desk setup |
| Psychological hazards | Hazards that can affect mental health, stress levels, or psychological well-being at work. | Harassment, excessive workload, violence, bullying, unclear expectations |
| Safety management hazards | Risks created when safety systems, training, supervision, procedures, or maintenance are missing or ineffective. | Missing procedures, inadequate training, poor inspections, weak supervision |
Common Physical Hazard Examples
Physical hazards can be obvious, but they are also easy to overlook when workers see them every day. A cluttered walkway, damaged ladder, unguarded machine, or noisy work area may become “normal” until an incident happens.
Common physical hazards include:
Slips, trips, and falls
Wet floors, uneven ground, loose cords, poor housekeeping, ice, snow, and unprotected edges can all create fall hazards.
Working at heights
Ladders, scaffolds, roofs, mezzanines, lifts, and elevated platforms require proper planning, inspection, training, and fall protection where required.
Moving equipment and machinery
Conveyors, saws, forklifts, skid steers, compactors, vehicles, and rotating parts can create struck-by, caught-between, crushing, and amputation hazards.
Noise
High noise levels can damage hearing over time. Noise hazards are common in construction, manufacturing, shops, processing facilities, and equipment-heavy workplaces.
Temperature extremes
Heat stress, cold stress, burns, frostbite, and fatigue can occur when workers are exposed to extreme temperatures or poor weather conditions.
Electrical hazards
Live circuits, damaged cords, overhead lines, improper grounding, temporary power, and poorly maintained equipment can expose workers to shock, burns, arc flash, or fire.
Pressure and stored energy
Compressed gas cylinders, hydraulic systems, pneumatic lines, steam systems, and pressurized containers can release energy suddenly if not controlled.
Fire and explosion hazards
Flammable vapours, combustible dust, hot work, poor ventilation, incompatible materials, and ignition sources can create serious physical hazards.
WHMIS Physical Hazards
The phrase WHMIS physical hazards has a more specific meaning than general workplace physical hazards.
Under WHMIS, hazardous products are grouped into two major hazard groups: physical hazards and health hazards. CCOHS explains that the physical hazards group is based on a product’s physical or chemical properties, such as flammability, reactivity, or corrosivity to metals.
This means a WHMIS physical hazard is not simply a slippery floor or poor lighting. It usually refers to a hazardous product that can burn, explode, react dangerously, release pressure, oxidize other materials, corrode metals, or create another physical danger because of its properties.
Examples of WHMIS physical hazard classes include flammable liquids, flammable gases, aerosols, gases under pressure, oxidizing materials, self-reactive substances, organic peroxides, corrosive to metals, combustible dusts, simple asphyxiants, and chemicals under pressure.
For more detail, employers can review the official CCOHS WHMIS hazard classes guide and Health Canada’s hazard communication requirements under WHMIS.
How Many Physical Hazard Classes Are There?
The number of WHMIS physical hazard classes depends on how the classes and updated regulatory categories are counted. A practical answer for employers is that WHMIS includes many physical hazard classes, including flammable, explosive, oxidizing, pressurized, reactive, corrosive-to-metal, combustible dust, simple asphyxiant, and chemicals-under-pressure classes.
Health Canada’s amended Hazardous Products Regulations introduced updates, including the adoption of Chemicals Under Pressure as a new physical hazard class. The transition period for the amended regulations ended on December 14, 2025, which means hazardous product classifications, labels, and safety data sheets now need to align with the amended requirements where applicable.
WHMIS includes multiple physical hazard classes. These classes group hazardous products by physical or chemical properties such as
flammability
pressure
oxidation
reactivity
explosiveness
corrosion to metals
Because WHMIS requirements can change, employers should check current SDSs, supplier labels, and official WHMIS guidance instead of relying on an outdated class list.
WHMIS Physical Hazard Classes: Practical Examples
| WHMIS Physical Hazard | What It Means | Workplace Example |
|---|---|---|
| Flammable products | Products that can catch fire easily | Solvents, fuels, aerosols, paints |
| Gases under pressure | Gases stored in compressed, liquefied, or dissolved form | Compressed gas cylinders, propane, oxygen |
| Oxidizing materials | Products that can intensify fire or cause other materials to burn faster | Oxidizing gases, liquids, or solids |
| Self-reactive substances | Products that may react dangerously without oxygen | Certain reactive industrial chemicals |
| Corrosive to metals | Products that can damage or destroy metal | Certain acids or corrosive liquids |
| Combustible dusts | Fine particles that may burn or explode under certain conditions | Wood dust, grain dust, metal dust |
| Chemicals under pressure | Products that contain liquids, solids, or gases under pressure | Certain pressurized chemical products |
Physical Hazard WHMIS Labels and Pictograms
WHMIS labels and safety data sheets help workers recognize hazardous products before they use them. Many WHMIS physical hazards are associated with pictograms, such as the flame, flame over circle, gas cylinder, corrosion, and exploding bomb.
The pictogram alone is not enough. Workers should understand the product identifier, hazard statements, precautionary statements, supplier information, and the safety data sheet. CCOHS notes that some hazard classes or categories may not require a pictogram, but the label and SDS still need the required hazard information.
Employers should make sure workers know where SDSs are located, how to read them, and how to apply the information to the actual task. GreenSpine Safety can support this through <a href="/training">workplace health and safety training</a>, WHMIS support, safe work procedures, and practical safety program documentation.
How to Identify Physical Hazards in the Workplace
Identifying physical hazards should be systematic. Do not rely only on memory or assume that hazards are obvious.
Start with a walkthrough inspection. Observe how work is actually performed, not just how it is supposed to happen on paper. Look at equipment condition, work layout, worker movement, traffic flow, lighting, housekeeping, noise, storage, weather exposure, and non-routine tasks such as maintenance or cleaning.
Then ask practical questions:
What could fall, strike, crush, burn, shock, cut, trap, or trip someone?
What energy sources are present?
What equipment could move unexpectedly?
What materials could ignite, explode, react, or release pressure?
Who could be harmed — workers, contractors, visitors, or the public?
Are young, new, temporary, or working-alone employees exposed to extra risk?
Are controls actually being used, or only written in a policy?
This process should connect directly to the employer’s broader <a href="/workplace-safety-program-british-columbia">workplace safety program</a>. Hazard identification, inspections, training, supervision, incident reporting, and corrective actions should all work together.
How to Control Physical Hazards
Once physical hazards are identified, employers need to assess the risk and choose practical controls. WorkSafeBC recommends evaluating how workers may be harmed and using risk assessment findings to decide whether enough has been done to protect workers.
The hierarchy of controls is a useful framework:
| Control Level | Meaning | Physical Hazard Example |
|---|---|---|
| Elimination | Remove the hazard completely | Complete work at ground level instead of at height |
| Substitution | Replace the hazard with something safer | Use a less flammable product where suitable |
| Engineering controls | Physically isolate people from the hazard | Machine guards, barriers, ventilation, fall protection systems |
| Administrative controls | Change how work is planned or performed | Training, inspections, signage, procedures, scheduling |
| PPE | Use protective equipment when other controls do not fully remove the risk | Hearing protection, gloves, eye protection, hard hats |
PPE is important, but it should not be the only answer when stronger controls are possible. For example, hearing protection may be needed in a noisy area, but the employer should also consider quieter equipment, barriers, maintenance, isolation, or work scheduling.
Physical Hazard Checklist for Employers
Use this checklist during inspections, safety program reviews, or supervisor walkthroughs:
Common Mistakes When Managing Physical Hazards
Many physical hazards are missed because they feel familiar. Employers may assume that workers “should know” how to avoid them, but familiarity is not the same as control.
Common mistakes include:
Using generic safety procedures that do not match the worksite
Failing to inspect non-routine tasks such as maintenance or cleanup
Treating PPE as the first control instead of the last layer of protection
Ignoring noise, heat, cold, and long-term exposure hazards
Not reviewing SDSs for WHMIS physical hazards
Failing to train new, young, temporary, or subcontracted workers
Not documenting inspections, corrective actions, and worker training
Waiting for an incident before updating procedures
Strong safety systems make hazard identification routine. The goal is not to create paperwork for its own sake. The goal is to make sure hazards are recognized, assessed, controlled, communicated, and reviewed.
Frequently Asked Questions
What are physical hazards?
Physical hazards are workplace conditions, energy sources, equipment, materials, or product properties that can physically harm workers. Examples include falls, noise, heat, cold, electricity, moving machinery, pressure, fire, and explosion risks.
What is a physical hazard?
A physical hazard is anything that can cause physical harm through the work environment, equipment, energy, or material properties. A damaged ladder, unguarded machine, loud equipment, icy walkway, or flammable product can all be physical hazards.
What are WHMIS physical hazards?
WHMIS physical hazards are hazardous products classified by physical or chemical properties such as flammability, pressure, oxidation, reactivity, explosiveness, or corrosion to metals. They are different from general workplace hazards like poor housekeeping or unprotected edges.
How many physical hazard classes are there in WHMIS?
WHMIS includes multiple physical hazard classes. The exact count can change depending on current regulations and how classes and categories are counted. Employers should check current SDSs, supplier labels, CCOHS guidance, and Health Canada requirements.
What is an example of a physical hazard?
A common example is a wet floor that could cause a slip and fall. Other examples include loud machinery, moving equipment, overhead work, hot surfaces, damaged electrical cords, flammable liquids, and compressed gas cylinders.
Conclusion
Physical hazards are among the most common workplace risks, but they are not always managed well. Some are visible, like an open edge or moving forklift. Others are easier to miss, like noise exposure, stored energy, poor lighting, combustible dust, or WHMIS physical hazards hidden inside product labels and safety data sheets.
A strong safety program identifies physical hazards before workers are harmed. It assesses the level of risk, chooses practical controls, trains workers, documents procedures, and reviews hazards whenever equipment, tasks, materials, or site conditions change.
GreenSpine Safety helps employers build practical safety systems, including hazard assessments, safe work procedures, workplace inspections, training support, and WorkSafeBC-aligned documentation. If your organization needs help identifying physical hazards or improving your workplace safety program, contact Greenspine Safety for practical support tailored to your worksite.
About the Author: Dan McMillan
Dan McMillan is the President of Greenspine Safety Solutions, an Indigenous-owned health and safety consulting company based in British Columbia. Dan brings real-world experience in safety leadership, forestry-sector safety, field-level safety support, advanced first aid, safety program development, workplace training, compliance support, and practical safety system improvement.
Through Greenspine Safety Solutions and Greenspine Academy, Dan helps employers across Vancouver Island, British Columbia, Alberta, and Western Canada build safer, clearer, and more practical workplace safety systems.
