Which class is used for Flammable Solids other than metals when burning time is less than 45 seconds and the flame passes the wetted zone?

• A. Class 4.1
• B. Packing Group II
• C. Packing Group III
• D. Self-reactive substance

Answer: (A)

The main idea here is identifying flammable solids that are not metals. In hazard classification, solids that ignite readily and burn rapidly fall into Class 4, and the specific non-metal flammable solids that burn quickly are categorized as Class 4.1. When a test shows a burning time under 45 seconds and the flame reaches beyond the wetted zone, that rapid, readily ignitable behavior places the material in the 4.1 category.

Packing Groups describe how to package and ship a substance (the degree of hazard for packaging), not the fundamental class of the material, so they don’t define the class itself. Self-reactive substances belong to a different hazard area related to reactivity, not the rapid burning of a solid. Therefore, the material described fits Class 4.1.