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Fire and light
All Containers›Shop by use case›Fire and light›What goes wrong›The scales were conflatedShop all fire and light →
What goes wrong

The scales were conflated

By Dwight Davis, Founder

On this page15
Same units, different objects.

A flashpoint was compared to a container rating

One is the temperature at which a liquid gives off enough vapor to ignite. The other is what the container tolerates.

So a 120 F container was thought to suit a 100 F flashpoint

Nothing follows. The container being within its range says nothing about whether the contents are above theirs.

Or to be unsafe for a 150 F flashpoint

Which also does not follow, and in the other direction.

The band boundaries were read loosely

At or below 20. Above 20 and below 100. At or above 100 to and including 150. Three different inclusivity patterns in three consecutive definitions.

So 100 F exactly was called flammable

It is combustible. The flammable band stops below 100 and the combustible band starts at or above it.

And a substance above 150 F was assumed to be in a band

The three bands stop at 150. Above it a substance is outside all three definitions.

A flashpoint was confused with an autoignition temperature

Two different measurements. A flashpoint needs an ignition source and an autoignition temperature does not.

The definitions were read as requirements

They are defined terms used in a labeling scheme, and what follows from a band is set out elsewhere and not here.

And a product was assumed to be a hazardous substance

Which is a determination about a specific product. Nothing on these pages makes one.

The test method was assumed

All three definitions cite the same method section and this property does not describe it.

The ambient temperature was left out entirely

Which is the one number that acts on both scales, and the one nobody writes down.

Three numbers and we supply one

The container rating. A flashpoint comes from the product documentation and the ambient from the use.

And our own two temperature figures were conflated as well

A container rating and the net quantity reference temperature in the bulk and dry goods property are both Fahrenheit figures on a packaging page, and one is a tolerance while the other is a measurement condition.

Read them separately, then together

Separately because they measure different things, and together because one environment acts on both.

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.