Flammable liquid
Under OSHA, any liquid with a flashpoint at or below 199.4°F (93°C), split into four categories.
Definition, in the source's words
29 CFR 1910.106(a)(19)(opens ecfr.gov in a new tab)“Flammable liquid means any liquid having a flashpoint at or below 199.4 °F (93 °C). Flammable liquids are divided into four categories as follows:”
What it means
The categories in 1910.106(a)(19): Category 1, flashpoint below 73.4°F (23°C) and boiling point at or below 95°F (35°C); Category 2, flashpoint below 73.4°F and boiling point above 95°F; Category 3, flashpoint at or above 73.4°F and at or below 140°F (60°C); Category 4, flashpoint above 140°F and at or below 199.4°F.
Example
A solvent has a flashpoint of 100°F. That's at or above 73.4°F and at or below 140°F, so it's a Category 3 flammable liquid, and its label carries the signal word Warning.
Where it appears on the exam
ASP: ASP11 Domain 4, Fire Prevention and Protection
Practice: Flammable Liquids
CHST: CHST5 Domain 2, Emergency Preparedness, Incident Investigation, and Response
Questions
- Does 1910.106 still use the term combustible liquid?
- No. Since OSHA aligned 1910.106 with the GHS in 2012, liquids that used to be called combustible, up to a 199.4°F flashpoint, are Category 4 flammable liquids.
Related
Checked 2026-10-16. Spot a problem? Email hello@passcited.com.