Safety Data Sheets: The 16 Sections Explained (Canada)

Sixteen headings, and four of them are allowed to sit empty. Here is how to read the one document that explains every hazardous product in your workplace.

What is a safety data sheet?

A safety data sheet is the full technical profile of a hazardous product. The label on the container gives you the warning. The SDS gives you everything else: what is inside, how it can hurt you, what to wear when you handle it, and what to do when something goes wrong.

Under WHMIS, every product classified as a hazardous product that is used, handled, or stored in a Canadian workplace must have one. The federal rules come from the Hazardous Products Act and the Hazardous Products Regulations, with Health Canada responsible for the supplier side. Your province enforces the workplace side.

A few product types are exempt under the federal Act because other laws already cover them. Explosives, food, drugs, cosmetics, pest control products, and radioactive nuclear substances each have their own legislation. Wood, tobacco, and manufactured articles are also excluded.

So a bottle of degreaser needs an SDS and a wooden pallet does not. Simple enough. But here is the part almost nobody knows: four sections of that degreaser's SDS can be legally blank. Which four, and why? The full list comes first.

The 16 sections at a glance

The Hazardous Products Regulations set out all 16 headings in Schedule 1. They must appear in this exact order, with their numbers. A supplier cannot shuffle them, rename them, or skip a heading.

In my kitchen inspections, the sections that matter most day-to-day are 4, 6, 7, and 8. A dishwasher splashed with degreaser needs Section 4 in seconds, not a binder hunt. That is why the fixed order exists. Everyone learns it once, and the first-aid steps are always in the same place on every sheet in the country.

Which sections can be left blank?

Sections 12, 13, 14, and 15. The regulations require the headings to be printed, in order, with their numbers. But under Canadian law, the supplier may omit the content underneath them.

Why would the law allow blanks on a safety document? Because those four sections cover areas already regulated by other Canadian laws. Transport of dangerous goods has its own federal rules, disposal is provincial and municipal, and environmental protection has separate legislation. WHMIS aligns with the global GHS format, which includes all 16 sections, but Canada makes the content of those four sections optional rather than duplicating other laws.

Most suppliers fill them in anyway, and Health Canada's guidance calls that good practice. So if you pick up an SDS and Section 14 is empty, the sheet is not defective. If Section 4 is empty, that is a different story entirely.

"Workers show me blank Section 14s and ask if the sheet is fake. It is not. The blank sections are the legal ones. The sheet I worry about is the one nobody in the kitchen can find when the sanitizer splashes."

Samira AliCertified Public Health Inspector, 10+ years across Canada and the U.S.

The English and French rule

Every SDS in Canada must provide its information in both official languages. The supplier can provide this as a single bilingual document or as two separate sheets, one in English and one in French. If they send two sheets, both must arrive together. An English-only SDS does not comply with the Hazardous Products Regulations.

That rule protects real people. A cook in Gatineau and a cleaner in Calgary both have the right to read the first-aid steps in the language they actually understand.

Now, if you have been around workplaces for a while, you may remember these documents under a different name, with a famous three-year expiry rule. That rule is gone, and what replaced it is stricter than most people think.

MSDS vs SDS: what changed since 1988

Under the original WHMIS 1988 system, the document was called a Material Safety Data Sheet (MSDS). It had 9 sections; suppliers could arrange information more loosely; and every sheet had to be updated at least every 3 years.

WHMIS 2015 aligned Canada with the global GHS standard and changed all three things:

• The name. MSDS became SDS.
• The format. 9 flexible sections became 16 fixed sections in a set order.
• The update rule. The three-year cycle is gone. Suppliers must keep the SDS accurate and compliant at the time of every sale. When a supplier learns of significant new data about a hazard, the SDS must be updated within 90 days.

Significant new data means information that changes the product's hazard classification or changes how you protect yourself against it. So the modern rule is event-driven, not calendar-driven. A sheet can remain valid for years if nothing changes, but it must be updated within 90 days if something does.

The supplier's job ends when the sheet reaches your workplace. From that moment, the duties belong to your employer, and those duties are more specific than most managers realize.

Your employer's SDS duties

Employers must make the SDS for every hazardous product readily available to workers who may be exposed to it, and to the health and safety committee or representative. The exact wording lives in each province's OHS law, and the details vary, so here are real examples by province.

Digital copies are allowed, with conditions

An employer can keep SDSs on a computer or tablet instead of a paper binder, but only if all workers can access the device and are trained to use it, the device is kept in working order, and a paper copy is provided on request. A tablet nobody can unlock does not count as access.

Here is a scenario I use in training sessions. A plant puts every SDS on one breakroom tablet and throws out the binders. A storm knocks out the power, a jug of corrosive cleaner spills in the dark, and the tablet is dead. The worker cleaning up the spill has no way to check what gloves the product requires. That employer failed the working-order condition the moment there was no backup. The fix is cheap: keep one paper set, or a charged backup device.

Missing or old sheets, by province

• In Alberta, the OHS Code allows an employer to store a product without a supplier SDS for up to 120 days, but only while actively seeking the SDS from the supplier.
• In British Columbia, WorkSafeBC's regulations require employers to obtain an up-to-date supplier SDS when the one on file is 3 years old. If the supplier cannot provide one, the employer must add any new hazard information they know of to the existing sheet.
• In every province, the working rule is the same: no worker should use a hazardous product without a findable, readable SDS.

So the sheets are in the binder or on the tablet. Job done? Not quite. When an inspector walks through the door, the binder is not what gets tested. You are.

The four questions an inspector will ask you

Inspectors check that products arrive with compliant labels and safety data sheets. But CCOHS is clear that inspectors also speak directly to workers to confirm training actually happened. For every hazardous product you work with, you should be able to answer four questions:

1. What are the hazards of the product?
2. How do I protect myself from those hazards?
3. What do I do in case of an emergency?
4. Where can I get further information?

Question 4 has a one-word answer: the SDS. And knowing where your workplace keeps them is part of your training, not a bonus. When workers cannot answer these, the finding lands on the employer, and retraining follows.

WHMIS training is what makes the other three answerable. The general education part teaches you to read labels, pictograms, and all 16 SDS sections. Your employer then adds the workplace-specific part for the exact products on your shelves. If you need the general certificate, our online WHMIS course covers labels, SDSs, and hazard classes, and there is a pay-after-you-pass option if you want to try the training first.