Chemical Flammability Database

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Free Tool · 80+ Chemicals

Chemical
Flammability Lookup

Search flash point, flammable limits (LFL/UFL), autoignition temperature, and NFPA 704 flammability ratings for common process industry chemicals. Search by name, CAS number, or chemical family. Compare multiple chemicals side by side.

Flash Point (°C / °F)LFL / UFL (vol%) Autoignition TempNFPA 704 Rating OSHA Flammable ClassSide-by-Side Compare
NFPA 704 Reference Diamond
H
Health
F
Fire
R
Reactive
SPEC
Special
4 — Extreme
3 — Serious
2 — Moderate
1 — Slight
0 — Minimal
W — Water Reactive
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All Hydrocarbons Alcohols Ketones Solvents Gases Amines
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OSHA Flammable / Combustible Classifications
ClassFlash PointNotes
Flammable IA<73°F (<23°C) & bp <100°FHighest hazard
Flammable IB<73°F (<23°C) & bp ≥100°FGasoline, ethanol
Flammable IC73–100°F (23–38°C)Styrene, xylene
Combustible II100–140°F (38–60°C)Diesel, fuel oil No. 2
Combustible IIIA140–200°F (60–93°C)Heavy fuel oil
Combustible IIIB≥200°F (≥93°C)Cooking oil, gear oil
NFPA 704 Flammability Rating Key
RatingCriteriaExamples
4Flash pt <73°F, bp <100°F, or burns in airPropane, H₂, ethylene
3Flash pt <73°F & bp ≥100°F, or fp <100°FGasoline, acetone
2Flash pt 100–200°FDiesel, cyclohexane
1Flash pt >200°FMineral oil, vegetable oil
0Will not burnWater, nitrogen

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