What does the yellow color on the NFPA placard signify?

The yellow color on the NFPA (National Fire Protection Association) placard signifies reactivity. This color coding system is utilized to quickly communicate the hazards associated with a material, providing essential information for emergency responders. The reactivity level addresses how likely a substance is to undergo a chemical reaction under certain conditions, which can include factors such as exposure to heat, shock, or other substances.

A high level of reactivity can indicate that the material is unstable or may react violently in the presence of water or other agents, which is crucial information for handling practices and emergency response situations. Understanding this color code helps first responders assess risks and take appropriate safety measures when dealing with hazardous materials.