Flammable liquids are liquids that have a flash point below 60 °C. Flammable materials are combustible materials that ignite easily at ambient temperatures. Flammable and combustible liquids are liquids that can burn.

An ideal example of flammable substances is propane. A material is considered combustible if it has a flash point higher than 37.8 ºC and below 93.3 ºC. Here's a simple demonstration that illustrates the difference between a flammable liquid and a combustible liquid. • Flammable substances catch fire quicker than combustible substances. Combustible liquids are any liquid, other than a flammable liquid that have a flash point and fire point that is below their boiling point.

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Flammable materials Combustible materials; A material is considered flammable if it has a flash point of any temperature below 37.8 ºC. The main factor that differentiates flammable and combustible liquids is their flash point. Flammable substances have a flashpoint below 37.8°C (100°F). Flammable materials are those that can catch fire and burn easily at normal working temperatures. Combustible materials can include anything that will burn. In other words, a combustible material ignites with some effort and a flammable material catches fire immediately on exposure to flame. Flammable is a material that can easily catch fire under normal circumstances and with the help of minimal ignition source. Just a spark is sufficient enough. Flashpoint is the lowest temperature at which the liquid gives off enough vapor to be ignited. Flammable and combustible are terms used to describe how easily a liquid ignites. According to OSHA, a paint thinner is considered a category 3 flammable object with a flashpoint of range 73.4-140 F. These categories are based on the flashpoint and boiling point of the material. • Combustible substances have a flash point at or above 37.8°C (100°F) and below 93.3°C (200°F). The main difference between the two is that flammable liquids can catch fire and burn easily at normal working temperatures, whereas combustible liquids require higher than normal temperatures to ignite. Whereas combustible liquids tend to catch the fire at higher temperatures that are usually above working temperatures. A combustible material is something that can combust (burn) in air. What is the difference between Combustible and Flammable? While we usually use the term to describe liquids, it is not the liquid that burns – it’s the vapor given off by the liquid. So, what is the difference between flammable and combustible?