Which document would you consult to understand the exact material designated by the last three digits of the DOT hazard code?

• A. The packaging specification
• B. The shipping paper
• C. The DOT hazard code listing that identifies the exact material
• D. The emergency response guidebook

Answer: (C)

When you need to know exactly which substance the last three digits of the DOT hazard code refer to, you rely on a definitive cross-reference that translates that numeric sub-code into the precise material name. The DOT hazard code listing is the authoritative source that maps those digits to a specific material, giving you the exact identification you need for proper handling and documentation. Packaging specifications tell you how to package HazMat but not what the code specifically identifies. The shipping paper includes the description required for transport, but it’s not the tool used to decode the numeric code into the exact material. The emergency response guidebook provides guidance for response actions, not the decoding of hazard code digits. So the hazard code listing is the direct resource for identifying the exact material from the code.