Generally, flammable liquids are easy to ignite yet hard to extinguish. They can ignite at room temperature and do not require an outside heat source to ignite. Combustible liquids, on the other hand, are hard to ignite yet generally easy to extinguish. They usually require temperatures above normal working conditions, or an external heat source to combust. Download your complimentary brochure to learn more about flammable & combustible liquids.