WHMIS lab safety checklist for labels, SDSs and chemical training
What WHMIS means for lab safety
WHMIS lab safety is the day-to-day use of Canada’s Workplace Hazardous Materials Information System in laboratories that buy, store, decant, test or create hazardous products. It is not only a training certificate. In an active lab, WHMIS ties together three controls workers rely on every day: clear labels, accessible safety data sheets and training that matches the work being done.
Health Canada describes WHMIS as Canada’s hazard communication standard. The Canadian Centre for Occupational Health and Safety also notes that laboratories have situations that need special attention, including small containers, decanted products, laboratory samples and biohazardous infectious materials. Since the amended Hazardous Products Regulations transition period ended on December 14, 2025, labs should verify that current labels and SDSs reflect the updated requirements where WHMIS applies.
This article is written for laboratory managers, safety coordinators, researchers, technicians and purchasing staff who need a practical way to check whether chemical hazard communication is working at the bench, in storage and during receiving. It provides general industry information, not legal advice, because WHMIS workplace enforcement can vary by federal, provincial or territorial jurisdiction.
The WHMIS framework laboratories should understand
WHMIS is built around hazard classification, labels, safety data sheets, and education and training. The federal Hazardous Products Act gives Health Canada authority over the sale and importation of hazardous products intended for Canadian workplaces. The Hazardous Products Regulations set classification and communication requirements for suppliers. Workplace duties are implemented through occupational health and safety rules in the applicable jurisdiction.
For a laboratory, supplier compliance and employer compliance meet at the receiving door. A bottle of solvent, corrosive reagent or compressed gas may arrive with a supplier label and SDS. The employer still has to make sure the product is properly labelled in the workplace, the SDS is readily available, workers understand the hazards, and suitable controls are in place.
| Party | Main WHMIS role | What it means in a laboratory |
|---|---|---|
| Supplier or importer | Classifies hazardous products and provides compliant labels and SDSs when required | Purchased chemicals should arrive with hazard communication that matches the product identifier and intended workplace use |
| Employer or lab operator | Maintains labels, SDS access, education, training and control measures | The lab must translate supplier information into storage rules, handling procedures, PPE selection, spill response and disposal practices |
| Worker or student worker | Participates in training and follows safe work procedures | People handling hazardous products must know where to find the SDS, how to read the label and what to do during an exposure or spill |
The most useful way to manage WHMIS is to treat it as part of the wider chemical safety system. It should connect with chemical inventory control, standard operating procedures, ventilation checks, incompatible storage reviews, emergency showers and eyewashes, waste handling and incident reporting. For more related safety topics, see the site’s lab safety resources.
Label requirements that matter at the bench
In laboratories, labels usually fail for practical reasons: small vials, solvents transferred into wash bottles, labels damaged by condensation, or shared containers left on a bench after a shift. WHMIS label management should focus on whether a worker can identify a material and its hazards quickly before handling it.
A supplier label is normally expected to communicate the product identifier, supplier identifier, hazard pictograms where required, signal word, hazard statements, precautionary statements and other required information. Health Canada guidance also emphasizes that labels and SDSs for hazardous products in Canada must be available in both English and French, either in bilingual form or as separate language documents where allowed.
Small containers
Small containers are common in analytical, research and teaching labs. CCOHS laboratory guidance explains that supplier labels for hazardous products in containers of 100 mL or less may carry reduced information and are not required to show hazard statements or precautionary statements on the label. The SDS must still provide the full hazard and precautionary information. For containers of 3 mL or less, the label may be designed to be removed at the workplace if it interferes with normal use, but it must remain durable and legible during storage and transport.
Decanted products
Decanting is one of the most common WHMIS weak points in labs. When a hazardous product is poured into another container, a workplace label is generally required if the product is not used immediately, if more than one person will control it, or if it will not be used up during the shift in which it was decanted. A practical workplace label should include the product name matching the SDS, safe handling precautions and a reference to the SDS when one is available.
At the bench, a simple rule is usually the safest: if a container may be set down, stored, handed off or left unattended, label it. Abbreviations that only one researcher understands are not enough for shared spaces, cleaners, emergency responders or new personnel.
Safety data sheets must be available and useful
An SDS should not disappear into a file after purchasing. Health Canada describes the SDS as a communication tool for hazards, precautions and first aid measures, and notes that WHMIS SDSs use a standard 16-heading format. For federally regulated workplaces, Canadian occupational health and safety regulations require applicable workplace or supplier SDSs to be readily available in English and French for employees and workplace safety representatives.
In a lab, SDS control should answer four practical questions:
- Can a worker find the correct SDS during normal work and during an emergency?
- Does the product identifier on the SDS match the bottle, vial, cylinder or kit component?
- Has the lab reviewed new or updated SDS information before putting the product into routine use?
- Are storage, PPE, spill and disposal procedures consistent with the hazards described?
Labs often hold legacy chemicals, donated materials, imported reagents, custom mixtures and samples with incomplete information. Where an SDS is missing or unclear, the lab should not rely on assumptions. A safer approach is to quarantine the material if necessary, contact the supplier or responsible investigator, check whether an exemption applies, and document the decision before use continues.
Training is more than a WHMIS certificate
One common misunderstanding is that WHMIS training is complete once a worker finishes an online course. CCOHS distinguishes general education from workplace-specific training. Education covers portable knowledge, such as how WHMIS works, hazard classes, pictograms, labels and SDS sections. Training explains how those hazards are controlled in the actual workplace, including storage, handling, use, disposal, spills and emergencies.
For a laboratory, that distinction matters. A generic WHMIS course may explain what a corrosive pictogram means, but it will not tell a technician where the lab stores compatible acid cabinets, which fume hood is approved for perchloric acid work, which gloves are specified for a solvent mixture, or how the local spill response process is triggered. See also: buying guides.
A strong WHMIS lab safety program should make workers able to answer four product-specific questions before independent work begins:
- What are the hazards of this product or sample?
- How do I protect myself and others from those hazards?
- What do I do if there is a spill, exposure, fire or other emergency?
- Where can I find more information, including the SDS and local procedure?
Training should be reviewed when new hazardous products are introduced, when procedures change, when SDSs identify new hazard information, after incidents or near misses, and when workers move into tasks with different exposures. Refresher training should be meaningful rather than a calendar-only exercise.
Laboratory samples, developed products and biohazards
Laboratories differ from many workplaces because they may receive unknowns, prepare mixtures, develop new products or test samples for clients. CCOHS guidance notes that laboratory samples may have specific exemptions when conditions are met, such as samples under 10 kg intended solely for laboratory testing. However, exemptions from some label or SDS requirements do not remove the employer’s duty to educate and train workers on hazards, safe use and storage.
Products developed in the laboratory
If a product developed in the laboratory will be used, handled or stored in a workplace and meets criteria for a WHMIS hazard class, the lab must classify its hazards and provide appropriate labelling and SDS information. When hazards are not yet known, the material may need to be treated as a laboratory sample until testing and evaluation are complete. The practical control is to document what is known, restrict access and avoid normalizing unlabeled unknowns.
Laboratory samples
For samples transferred to a lab for analysis, reduced information may apply in specific situations, especially where chemical identity or concentration is not fully known or where possession transfers without ownership. Even then, workers need enough information to respond safely. Labels for hazardous laboratory samples may need to identify known ingredients and provide an emergency contact able to supply hazard information.
Biohazardous infectious materials
WHMIS includes a class for biohazardous infectious materials. CCOHS laboratory guidance states that a full 16-section SDS plus a 9-section biohazard appendix is required when a lab receives a hazardous product classified as a biohazardous infectious material, including when it is also classified in another hazard class. Labs handling pathogens may also need biosafety requirements beyond WHMIS, so WHMIS should be integrated with containment, decontamination and institutional biosafety procedures.
A practical WHMIS lab safety checklist
The following checklist can help convert WHMIS requirements into a routine lab review. It is not a substitute for jurisdiction-specific compliance advice, but it highlights the controls most likely to affect daily safety.
| Checklist area | Questions to ask | Evidence to keep |
|---|---|---|
| Chemical inventory | Is every hazardous product listed with location, owner and status? | Current inventory, receiving records and disposal records |
| Supplier labels | Are original labels legible, durable and matched to the product? | Receiving checks and relabelling records |
| Workplace labels | Are decanted and secondary containers labelled when not under immediate single-person control? | Bench inspections and corrective actions |
| SDS access | Can workers find the right SDS quickly in normal and emergency conditions? | SDS index, electronic access process and backup method |
| Training | Does training cover actual lab products, tasks, PPE, spills and waste procedures? | Training records, competency checks and procedure sign-offs |
| Change control | Are new products reviewed before use? | Pre-use review forms, approvals and updated SOPs |
| Special lab cases | Are small containers, unknowns, samples and biohazards handled under documented rules? | Sample intake procedures and risk assessments |
The most useful result from a checklist is not the score; it is the pattern of gaps. If several findings involve decanted bottles, the issue may be workflow and label availability. If SDSs exist but workers do not use them, the issue may be training design. If old products lack clear ownership, the issue may be inventory governance.
Common WHMIS mistakes in laboratories
- Treating WHMIS as paperwork only. Labels and SDSs are hazard communication tools, but they must connect to ventilation, PPE, storage and emergency response.
- Using short names that are not shared language. A vial marked only with initials or a project code may be meaningless to another worker.
- Ignoring small-container limits. Reduced label information may be allowed in some cases, but the hazard information still has to be available through the SDS and training.
- Assuming old SDS files are current. New hazard information, formulation changes and regulatory updates can make old files unreliable.
- Confusing general education with site training. A certificate does not replace task-specific instruction at the bench.
- Forgetting imported or custom materials. Foreign supplier documents may need review against Canadian WHMIS requirements, especially when the material is used in a Canadian workplace.
Frequently asked questions
Does WHMIS apply to all laboratories in Canada?
WHMIS applies to hazardous products used, handled or stored in Canadian workplaces, including laboratories. Some laboratory situations may have specific exemptions or reduced information requirements, but employers still need to provide education and training on hazards, safe use and storage.
Is a WHMIS certificate enough for lab work?
No. A certificate may show completion of general WHMIS education, but laboratory workers also need workplace-specific training for the products, equipment, storage areas, waste streams, spill procedures and emergency contacts in their own lab.
Do all decanted lab containers need labels?
A workplace label is generally required when the decanted product is not used immediately, when more than one person controls it, or when it is not used up during the shift in which it was decanted. Immediate-use exceptions should be applied carefully in shared labs.
What changed after the amended Hazardous Products Regulations transition period?
Health Canada states that amendments aligned the regulations with the seventh revised edition and some provisions of the eighth revised edition of the Globally Harmonized System. The transition period ended on December 14, 2025, so labs should check that current supplier labels, SDSs and training materials reflect the updated requirements where applicable.
How often should a lab review its WHMIS program?
Review should occur at least when new hazardous products, procedures or equipment are introduced, when SDSs change, after incidents or near misses, and when workers take on new tasks. Many labs also include WHMIS checks in scheduled inspections and annual safety program reviews.
