Placards may be omitted for Hazard Division HD ______ material on base with written approval.

• A. HD 1.1 material
• B. HD 1.2 material
• C. HD 1.4 material
• D. HD 2.1 material

Answer: (C)

Placards are used to communicate how dangerous a shipment is, but some very low-hazard explosives can be shipped with fewer warnings in controlled settings. Hazard Division 1.4 materials are designed to pose only a minor blast hazard and have limited potential to cause significant damage or projection. In a military base or similar controlled environment, with written approval from the appropriate authority, these low-hazard items can be released from placarding because the risk is managed through proper procedures and limits. The other divisions represent higher risks (for example, divisions tied to larger blast or fragmentation hazards or different properties like flammable gas), so they still require placards. Therefore, the material that fits this exception is HD 1.4.