Hazard communication: SDS, labels, and your right to know

Every chemical on your site, from concrete sealer to solvent to fuel, has to have a Safety Data Sheet you can get to, a proper label on its container, and you have to be trained to read both before you use it. This is the "right to know" standard, 29 CFR 1910.1200, and it applies to construction just like everywhere else. It is one of OSHA's most-cited standards every year because contractors treat chemicals as harmless when they are not. Knowing where the SDS is and how to read it is the difference between a rash and a hospital visit. This is federal OSHA in 2026.‍‌‌​​‌​​‌‌‌‌‌​​‌‌‌‌‌​‌‌‌‌​​​​‌​‌‌‍

The four things a site needs

HazCom comes down to four requirements:

• A written HazCom program. A document that says how your company handles chemical hazards: who keeps the inventory, where the SDSs live, and how workers are trained.
• A chemical inventory. A list of the hazardous chemicals present on the job.
• Safety Data Sheets, accessible at all times. An SDS for every hazardous product, that any worker can get to during their shift. On paper in a binder or electronic, as long as it is actually reachable when someone needs it.
• Labels on every container. Original manufacturer labels stay on, and anything you pour into a secondary container gets labeled too. An unlabeled jug of "some kind of solvent" is both a hazard and a violation.

What an SDS tells you

Safety Data Sheets follow a standard 16-section format under the Globally Harmonized System (GHS), so once you know the layout, every SDS reads the same way. The sections you reach for most on site:

• Section 2, Hazard identification: what the product can do to you, with the signal word and pictograms.
• Section 4, First aid: what to do if it gets in your eyes, on your skin, or in your lungs.
• Section 7, Handling and storage: how to use and store it safely.
• Section 8, Exposure controls and PPE: the gloves, eye protection, or respirator the product calls for.

When something goes wrong with a chemical, the SDS is the first thing you grab, so know where it is before you need it, not during the emergency.

All sixteen, in the order they always appear

The order is fixed by 1910.1200(g)(2), so the section number is a reliable shortcut on any SDS from any manufacturer:

Sections 12 to 15 are on the sheet but are not OSHA's. The standard says so in its own note: OSHA "will not be enforcing information requirements in sections 12 through 15, as these areas are not under its jurisdiction". They are there because the format is international. Do not go to OSHA about a thin section 13.

And section 16 is the one nobody reads and should. It carries the date of preparation or last revision, which is how you find out the sheet in your binder is from two formulations ago.

Reading a label

GHS labels use a common set of elements so a hazard reads the same across products:

• A signal word: "Danger" for the more severe hazards, "Warning" for the less severe.
• Pictograms: the red-bordered diamonds, like the flame for flammable, the skull for acutely toxic, the corrosion symbol for something that burns skin.
• Hazard and precautionary statements: short lines telling you the risk and what to do about it.

Learn the pictograms once and you can size up a container's risk at a glance.

"Label elements" is a defined term in the standard, not a loose description: it means the pictogram, hazard statement, signal word and precautionary statement for each hazard class and category. A shipped container also carries the product identifier and the supplier's name, address and telephone number. If one of those is missing from a container that came in that way, the problem is upstream with the manufacturer, not with you.

The training trigger people miss

1910.1200(h)(1) requires training at the time of initial assignment, which most contractors do. It also requires it whenever a new chemical hazard the crew has not previously been trained about is introduced into the work area, which most do not. Bringing a new product on site is a training event, not just a purchase. Training may be organized by category of hazard, flammability or corrosivity for instance, rather than product by product, but the chemical-specific detail must always be available through the label and the SDS.

And for the avoidance of doubt about whether this applies to construction at all: 1926.59 says the requirements for construction work "are identical to those set forth at 1910.1200". There is no lighter construction version.

Training comes before exposure

Workers have to be trained on the HazCom program, how to read an SDS and a label, and the hazards of the specific chemicals they work with, before their first exposure, not after. That training is the employer's job, and it is not a one-time formality when new products come on site.

Common questions

What is a Safety Data Sheet and where do I find it?

A Safety Data Sheet, or SDS, is a standardized document that spells out a chemical's hazards, first aid, safe handling, and required PPE. Your employer has to keep an SDS for every hazardous product on site and make it accessible to you during your shift, on paper or electronically. Find out where the SDSs are kept before you need one, because you will need it fastest in an emergency.

What is the difference between an SDS and the old MSDS?

They are the same idea, but the SDS replaced the older Material Safety Data Sheet and follows a fixed 16-section format under the Globally Harmonized System. The standardized layout means every SDS is organized the same way, so hazard information is always in Section 2, first aid in Section 4, and PPE in Section 8. If you still see "MSDS," it is just the older name.

Do I need a label on a container I poured chemicals into?

Yes. Any secondary container you transfer a hazardous chemical into has to be labeled with its contents and hazards. The only narrow exception is a container you fill and use up yourself within the same shift, without setting it down for someone else. An unlabeled jug of solvent is both a serious hazard and a common OSHA violation.

What do the symbols on a chemical label mean?

They are GHS pictograms, red-bordered diamonds that show the type of hazard at a glance: a flame for flammable, a skull for acutely toxic, a corrosion symbol for something that burns skin, and others. The label also carries a signal word, "Danger" for more severe hazards or "Warning" for less severe. Learn the pictograms once and you can read any container's risk quickly.

The honest bit

• HazCom is federal OSHA under 29 CFR 1910.1200 and applies to construction in 2026. Verify current requirements at osha.gov.
• About 22 states run their own OSHA program and can require more. See Working in Your State.
• This is general guidance, not training. The SDS for your specific product is the authority on how to handle it, and reading it is not optional.

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