F

Flash Point

Quick Reference
Also Known AsIgnition point, fire hazard temperature, flash temperature

What is Flash Point?

The flash point is the lowest temperature at which a liquid produces sufficient vapor to form an ignitable mixture with air near the surface when exposed to a brief ignition source. It is a key fire safety parameter for classifying and handling flammable and combustible liquids. Flash point differs from fire point (sustained combustion) and autoignition temperature (spontaneous ignition).

Properties & Characteristics

Measured by closed-cup (Pensky-Martens) or open-cup (Cleveland) methods. Classification: Flammable liquid (flash point < 60°C), Combustible liquid (flash point 60–93°C). Examples: acetone = −20°C, ethanol = 13°C, diesel = 52–96°C, lubricating oil = 200°C+. Increases with molecular weight for homologous series.

Uses & Applications

Fire and explosion hazard classification. Safe storage temperature determination. Transportation regulations (IATA, DOT, ADR). Chemical safety data sheets (SDS). Industrial process safety limits. Building code compliance for flammable storage.

Safety Information

Critical safety parameter — materials with low flash points must be stored in flammable storage cabinets. Keep away from ignition sources. Temperature monitoring in storage areas. Different handling requirements for flammable vs. combustible liquids.

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

Key Facts

Term Flash Point
Synonyms Ignition point, fire hazard temperature, flash temperature

Frequently Asked Questions

The flash point is the lowest temperature at which a liquid produces sufficient vapor to form an ignitable mixture with air near the surface when exposed to a brief ignition source. It is a key fire safety parameter for classifying and handling flammable and combustible liquids. Flash point differs from fire point (sustained combustion) and autoignition temperature (spontaneous ignition).

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