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NFPA 30 Liquid Classifier

Classifies a liquid using closed-cup flash point and boiling point (when needed). Results update automatically.

NFPA 30 logic

Inputs NFPA 30 classification

Closed-cup flash point

°F

Boiling point (normal) Optional

°F

Boundaries are evaluated using consistent internal US customary thresholds to avoid unit-toggle edge-case drift near cutoffs.

Note: NFPA 30’s Class I definition includes an RVP condition at 100°F (37.8°C); it is not evaluated here.

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Results update automatically as you edit inputs.

NFPA 30

Base class —

Subclass —

Category —

For engineering use: verify applicability and inputs. This tool supports decisions but does not replace professional judgment.

Assumptions & Applicability

Classification follows NFPA 30 liquid classes based on closed-cup flash point. Class I is further subdivided using boiling point when needed.
Boiling point is treated as the normal boiling point (≈1 atm). If only a boiling range is known, use the most representative value for engineering screening.
Mixtures, solutions, and blended products should be classified using appropriate test data and/or the product SDS; this tool does not infer mixture behavior.
Always confirm how local codes/standards adopt or modify NFPA 30 classes for storage/use scenarios.

References

NFPA 30 — Flammable and Combustible Liquids Code (2024), Section 4.2 (Classification Scheme).

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