What does a hazard communication label that indicates 'Flammable' signify?

The indication of 'Flammable' on a hazard communication label signifies that the substance can easily ignite and catch fire. This label is critical for ensuring safety as it alerts individuals to the potential dangers associated with handling or being near the substance. Flammable materials can ignite from a spark, heat, or even from static electricity, posing significant risks in various settings, including clinical and laboratory environments.

Understanding this hazard is essential for implementing proper safety measures, such as storing the substance away from heat sources and ensuring adequate ventilation. Safety Data Sheets (SDS) related to flammable substances provide further guidance on handling and emergency procedures, underscoring the importance of recognizing and responding to flammability hazards appropriately.

The other options suggest characteristics that do not directly relate to the risk of ignition, failing to address the primary concern of fire safety associated with flammable substances.