Combustible liquid without flame picture vs flammable red picture CDL endorsement picture…
Both have a flame. Combustible and flammable liquids are both Class 3 and both use a red placard with the same flame symbol and a 3. The difference is the word on the placard, COMBUSTIBLE versus FLAMMABLE, and the flash point behind it, not the picture. Expecting combustible to have no flame symbol is the misconception.
The misconception
It is easy to assume that combustible, being less easily ignited than flammable, would get a tamer placard with no flame. That is not how it works. Combustible liquids carry the same red diamond with the same flame symbol; the placard does not drop the flame just because the flash point is higher.
What is actually the same
Both flammable and combustible liquids are Class 3, both use red, both show the flame symbol, and both carry the number 3. Visually, the diamonds are nearly identical. So if you are hunting for a flame-versus-no-flame difference, you will not find one, which is exactly the trap.
What actually differs
The real difference is the word and the flash point:
| Flammable | Combustible | |
|---|---|---|
| Class | Class 3 | Class 3 |
| Color | Red | Red |
| Symbol | Flame | Flame |
| Placard word | FLAMMABLE | COMBUSTIBLE |
| Flash point | Lower (ignites more easily) | Higher (ignites less easily) |
Same red flame placard; the word and flash point differ. Confirm specifics in your official manual.
Why both keep the flame
Both materials can burn; the difference is how easily, set by the flash point. Since both present a fire hazard, both earn the flame symbol and the red Class 3 color. The wording then tells a reader which side of the flash-point line the liquid falls on, flammable for the lower, combustible for the higher.
How to read it correctly
Do not look for a missing flame. Read the word on the placard: FLAMMABLE or COMBUSTIBLE. That word, backed by the flash point, is the only reliable difference. Drill the two as the same red flame diamond with different text so the no-flame assumption never trips you. Verify the flash-point definitions in your official manual.
Frequently asked questions
- Does a combustible liquid placard have a flame?
- Yes. Combustible liquids use the same red Class 3 placard with the flame symbol as flammable liquids. The difference is the word COMBUSTIBLE versus FLAMMABLE and the flash point, not the symbol. Confirm in your official manual.
- How is combustible different from flammable?
- Both are Class 3 red placards with a flame. Flammable liquids have a lower flash point and ignite more easily; combustible liquids have a higher flash point. The placard word tells you which.
- Is there a flame-less placard for combustible?
- No. There is no flame-less version. Both flammable and combustible keep the flame symbol; only the wording and flash point change.