Which type of placard is used for materials that are flammable?

The type of placard used for materials that are flammable is the red placard. In the Hazardous Materials Regulations, red is the designated color for flammable substances, which include a variety of materials that can easily ignite and cause fire hazards. This color-coding is essential as it provides immediate visual recognition for safety personnel and emergency responders, alerting them to the potential dangers associated with transporting or handling flammable materials.

The other placard colors correspond to different types of hazards: blue typically represents health hazards, green is used for non-flammable gases, and yellow is for reactive materials. This standardized system helps ensure clarity and consistency in hazardous material communications across various industries and transport modes.