C

Combustible

Flash point 60–93°C
Quick Reference
Formula / NotationFlash point 60–93°C
Also Known AsFlammable (loosely), burnable substance, ignitable material

What is Combustible?

A combustible substance is one capable of burning in oxygen to produce heat and light. In regulatory contexts, combustible liquids typically have flash points above 37.8°C (100°F), distinguishing them from flammable liquids with lower flash points. Combustion is an exothermic oxidation reaction; common combustible materials include organic compounds, many metals, and some inorganic compounds.

Formula & Notation

Flash point 60–93°C

Other Names / Synonyms: Flammable (loosely), burnable substance, ignitable material

Properties & Characteristics

A combustible substance is one capable of burning in air when ignited, typically defined as having a flash point above 60°C but below 93°C (distinguishing it from "flammable" materials with lower flash points). Combustion is the rapid exothermic reaction of a fuel with oxygen, producing heat, light, and combustion products (CO₂, H₂O, CO, soot depending on completeness). Complete combustion requires sufficient oxygen and high enough temperature.

Uses & Applications

Combustible materials are used as fuels (diesel, jet fuel, fuel oils), in industrial processes (combustible dusts in grain, coal, wood), and in thermite and pyrotechnic formulations. Controlled combustion drives heat engines, turbines, and power generation.

Safety Information

Combustible materials require proper storage (cool, well-ventilated, away from ignition sources), labelling, and handling procedures. Combustible dust explosions (grain silos, coal mines, flour mills) can be catastrophic. Use ATEX-rated equipment in combustible dust environments.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Combustible
Formula Flash point 60–93°C
Synonyms Flammable (loosely), burnable substance, ignitable material

Frequently Asked Questions

A combustible substance is one capable of burning in oxygen to produce heat and light. In regulatory contexts, combustible liquids typically have flash points above 37.8°C (100°F), distinguishing them from flammable liquids with lower flash points. Combustion is an exothermic oxidation reaction; common combustible materials include organic compounds, many metals, and some inorganic compounds.

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