Definition
Standardized documents that describe the physical and chemical properties of a hazardous material, along with the health risks it poses, safe handling and storage procedures, protective equipment requirements, first-aid measures, and emergency response actions for spills, fires, or exposure. In aviation maintenance, an MSDS must be on file for every hazardous chemical used in the shop, including solvents, paints, lubricants, sealants, and cleaning agents.
Plain English
An information sheet that comes with chemicals used in the shop. It tells you what the chemical is, what harm it can do, how to handle it safely, what protective gear to wear, and what to do if you get it on your skin, breathe it in, or spill it.
Context Anchor
Seen in aircraft maintenance shops, hangars, fuel areas, paint areas, and anywhere pilots or mechanics handle oils, solvents, cleaners, fuels, battery chemicals, or other hazardous products.
Derivation
From 'material' (the chemical substance), 'safety' (protection from harm), and 'data sheet' (a single-page reference of facts). The name describes exactly what it is: a fact sheet about safely handling a substance. Note: in 2012 these were officially renamed Safety Data Sheets (SDS) under the updated OSHA Hazard Communication Standard, though the older term MSDS is still widely used in shops.
Why Pilots Care
Mechanics and pilots involved in aircraft servicing must follow these sheets to avoid chemical injuries and meet regulatory safety requirements.
Intuition Check
Do not think of these as ordinary product information sheets. They are safety documents meant to guide safe handling, emergency response, and protection from hazardous materials.
Example Sentence 1
Before using the new paint stripper, the technician checked the Material Safety Data Sheets to confirm what gloves and respirator were required.
Example Sentence 2
The maintenance crew consulted the Material Safety Data Sheets for hydraulic fluid to select the correct gloves and eyewear.