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Fire and light
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Three bands

Three bands

By Dwight Davis, Founder

On this page14
At or below, above and below, at or above and to and including.

Extremely flammable

Any substance which has a flashpoint at or below 20 degrees F. The lowest band and the only one with no floor.

Flammable

Any substance having a flashpoint above 20 degrees F and below 100 degrees F. Open at both ends of the interval, which excludes 20 and 100 exactly.

Combustible

Any substance having a flashpoint at or above 100 degrees F to and including 150 degrees F. Closed at both ends, which includes 100 and 150 exactly.

So the boundary language matters

At or below. Above and below. At or above and to and including. Three different inclusivity patterns in three consecutive definitions.

Which means 20 F is extremely flammable and not flammable

Because the first band includes 20 and the second starts above it. A substance at exactly 20 F falls in the lower band.

And 100 F is combustible rather than flammable

Because the flammable band stops below 100 and the combustible band starts at or above it.

There is nothing above 150 F

The three bands stop there. A substance with a flashpoint above 150 F is outside all three definitions.

Each band cites the same test method

As determined by the test method described in another section, which is cited in all three and is not described here.

So a flashpoint is a measured figure, not an estimate

Which is why the band boundaries can be stated to the degree. The measurement has a method.

The bands describe a substance

Not a package, not a use and not a container. Which is the point the next section is about.

And they are definitions rather than requirements

They define terms used elsewhere in a labeling scheme. What follows from falling in a band is not described on these pages.

Our container ratings have their own boundaries

120 F, 190 F and 300 F, which are ceilings rather than bands and belong to a different measurement entirely.

Three bands and three ceilings, and no relationship between them

Which is the whole of this property in one line.

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
The Davis Pack Supply catalog, measured 19 October 2026. A temperature range is published on all 208 containers in this group and takes three values: -40 to 120 F on 146 containers, -100 to 300 F on 33, and -100 to 190 F on 29. A container temperature rating describes what the container tolerates. It is not a flashpoint, it is not a flammability statement, and it has no bearing on whether contents will ignite.
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.