What classification label is assigned to containers of flammable solids, receiving a hazardous classification of 4?

The classification label assigned to containers of flammable solids, which receive a hazardous classification of 4, is the United Nations Label. This label system is part of the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) and reflects the risks associated with specific hazardous materials, including flammable solids. The United Nations label provides important information for transportation and storage, ensuring that those handling these materials recognize their potentially hazardous nature.

Flammable solids are materials that can ignite readily and burn quickly, and the classification under the UN system indicates their specific risks and necessary precautions. This includes the need for appropriate storage conditions and handling procedures to mitigate fire risks.

The other options, while related to hazardous materials, do not apply to flammable solids classified under division 4.1. The Environmental Hazard Label pertains specifically to aquatic toxicity and does not cover flammable solids. The Flammable Liquid Label is designated for liquids that can catch fire at normal temperatures, and the Gas Cylinder Label applies to compressed gases. Each of these labels is used for different classifications of hazardous materials and is not suitable for identifying flammable solids classified under the 4 series.