Dangerous Goods Practice Test - Free Practice Exam & Study Guide

The estimated flash point for Class 4.1 flammable solids is accurately identified as less than or equal to 100°C (212°F). This classification includes materials that, while solid at room temperature, can ignite and burn when exposed to a source of ignition. The importance of the flash point in this context lies in its role in determining the hazard levels of combustible materials.

Materials classified under Class 4.1 are those that may ignite easily and pose a significant fire risk. By defining the flash point threshold as being less than or equal to 100°C, regulations ensure that these solids are stored, handled, and transported with an understanding of their fire hazard potential. This threshold helps in safely managing these materials to prevent accidents and ensure compliance with safety standards.

In contrast, other options suggest higher flash points that do not accurately reflect the characteristics of Class 4.1 flammable solids, which are specifically noted for their low ignition temperatures, leading to their classification within this category.