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Fire and light
All Containers›Shop by use case›Fire and light›Three bands›A definition, not a ruleShop all fire and light →
Three bands

A definition, not a rule

By Dwight Davis, Founder

On this page14
These are defined terms. Used elsewhere, in a scheme this property does not describe.

The section defines terms

Extremely flammable, flammable and combustible, each by a flashpoint band and a test method.

Which are used in a labeling scheme

The Federal Hazardous Substances Act scheme, where a substance falling in a band attracts labeling consequences set out elsewhere.

And those consequences are not described here

What a label must say, where it must say it and in what type size are outside this property entirely.

Nor is whether any product is a hazardous substance

Which is a determination about a specific product, and nothing on these pages makes one.

So the bands are quoted for the numbers

Because 20, 100 and 150 degrees F are the figures somebody will set against a container rating, and this property exists to say they should not.

The test method is cited three times and not described

All three definitions reference the same method section. Reproducing it from memory would be inventing a procedure.

Which is the standing discipline in this library

Quote what was verified, cite what was not, and never fill a gap with something plausible.

A flashpoint is also not an autoignition temperature

It is the temperature at which a liquid gives off enough vapor to ignite in the presence of a source, which is a different figure again.

Three measurements, all in Fahrenheit, all different

A flashpoint, an autoignition temperature and a container rating. This property is about the first and the third.

And none of them is a fire code

How much of a flammable liquid may be stored where is a fire code question and is not addressed anywhere here.

The shop consumables property covers one adjacent rule

Container size limits by material for a flammable liquid in a workplace, which is a different scheme with its own table.

So there are at least three schemes in this neighborhood

A hazardous substance labeling definition, a workplace container limit and a fire code. This property quotes one of them.

Read the band, then find the scheme

Which is the same order every property in this library arrives at.

References

16 CFR 1500.3(c)(6): "The term extremely flammable shall apply to any substance which has a flashpoint at or below 20 degrees F (-6.7 degrees C) as determined by the test method described at Sec. 1500.43a"; "The term flammable shall apply to any substance having a flashpoint above 20 degrees F (-6.7 degrees C) and below 100 degrees F (37.8 degrees C), as determined by the method described at Sec. 1500.43a"; "The term combustible shall apply to any substance having a flashpoint at or above 100 degrees F (37.8 degrees C) to and including 150 degrees F (65.6 degrees C) as determined by the test method described at Sec. 1500.43a". These definitions describe a substance and are part of the Federal Hazardous Substances Act labeling scheme; the test method cited is not described here, and nothing on these pages says whether any product is a hazardous substance. law.cornell.edu
Written from 16 CFR 1500.3(c)(6) and from the catalog as it stood on 19 October 2026. Those definitions describe a substance and say nothing about a container: a flashpoint is the temperature at which a liquid gives off enough vapor to ignite and a container temperature rating is what the container tolerates, so a container can be inside its rating while its contents are above their flashpoint. Nothing here says whether any product is a hazardous substance, what labeling it requires, or whether any container is suitable for a candle, a fuel or a flame. The test method cited in the definitions is not described.