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Reading Safety Data Sheets

A safety data sheet can look long and technical, but a few sections answer most practical questions. This guide shows how to approach one calmly and when to ask for help.

What is a safety data sheet?

A safety data sheet, often called an SDS, is a document from the manufacturer or supplier that describes a chemical product: what it is, what hazards it has and how to handle, store and respond to problems with it.

They follow a standard layout, so once you learn where to look, any sheet becomes easier to use. Sheets for different products can be quite different in what they say, so read the one for the product in your hands.

Most manufacturers also provide a one-page summary of key information, but the full sheet should still be kept on file.

How do I get the right one?

Ask the supplier for a sheet when you buy a product, and look on the manufacturer's website if you need a replacement. Make sure the sheet matches the exact product name and the current version.

Keep them together, organized by product, and keep a copy where you can reach it in an emergency. Replace old ones when you receive updates, and remove sheets for products you no longer have.

If a supplier cannot provide a sheet, treat that as a warning sign and ask the manufacturer directly.

• Match the sheet to the exact product name.
• Keep the current version where all users can reach it.
• Update it when the manufacturer revises it.

Which parts should I read first?

Start with the sections that identify the product and describe its hazards, then the ones on first aid, fire response, accidental release, handling and storage, and exposure controls and protective equipment.

You do not need to read everything every time. Learn where these key parts are, and read them before you use a new product, not in the middle of an emergency.

A simple trick is to flag the first aid, fire and spill pages with a tab so they can be found fast, and to keep a printed copy in the truck for products you carry.

What do hazard words and symbols mean?

Sheets and labels use signal words and pictograms to give a quick idea of the hazard. Treat these as an alert to read the details, and not as a ranking that tells you what is safe.

A product with a milder-looking label can still cause harm if misused. If you are unsure what a term or symbol means, ask the supplier, OSHA or your extension office.

Remember that a missing symbol does not mean a missing hazard, so read the text.

What about technical terms and numbers?

Sheets can include technical terms and exposure values. Do not try to interpret exposure numbers on your own or compare products using them without help.

If a term is unclear, call the number listed on the sheet for the manufacturer or an emergency contact. An occupational health professional can explain what the information means for your work.

How do I use a sheet in an emergency?

In an emergency, call 911 first for serious exposures, fires or large releases. If you can do it safely, have the sheet or the container ready for responders and medical staff.

This site does not give emergency procedures. Learn the first aid and spill sections of your sheets ahead of time with your crew, and ask a trainer to walk through the plan.

Practice makes it easier. Pick a product you use often, sit down with two or three coworkers and answer a few questions from the sheet together.

How do I make sheets part of my routine?

Review the sheet for any new product before you buy it, so you know whether you can store and use it safely. Add the sheets to your yearly safety review, along with your inventory.

Show new workers where the sheets are kept and how to find the sections they need. A short practice exercise makes it far more likely that they will use them. If you find a sheet confusing, you are not alone, since they are written for a wide audience. Ask the supplier, the manufacturer or an occupational health professional to explain it, and write the answers on a note that you keep with the sheet.

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.