What does the 3 Flammability diamond indicate?

What does the 3 Flammability diamond indicate?

• A. If in liquid or solid form, can be ignited under almost all ambient temperature conditions
• B. Ignition only at very high temperatures
• C. In liquid or solid form, can be ignited under almost all ambient temperature conditions
• D. Cannot ignite under ambient conditions

Answer: (C)

On the NFPA 704 hazard diamond, the red section shows flammability. A rating of 3 means the material can be ignited under almost all ambient temperature conditions, so it can catch fire from common ignition sources at room temperature. This applies to the material in its liquid or solid form. It’s more flammable than a rating of 2 (which needs higher temperatures to ignite) but less extreme than a rating of 4 (which would ignite very readily at normal temperatures). So the description that the material can be ignited under almost all ambient temperature conditions for liquids or solids is the correct understanding.

On the NFPA 704 hazard diamond, the red section shows flammability. A rating of 3 means the material can be ignited under almost all ambient temperature conditions, so it can catch fire from common ignition sources at room temperature. This applies to the material in its liquid or solid form. It’s more flammable than a rating of 2 (which needs higher temperatures to ignite) but less extreme than a rating of 4 (which would ignite very readily at normal temperatures). So the description that the material can be ignited under almost all ambient temperature conditions for liquids or solids is the correct understanding.