Which code corresponds to steel drums with non-removable heads?

• A. 1A1
• B. 1A2
• C. 1N1
• D. 3A1

Answer: (A)

The concept tested is how UN packaging codes encode container type, material/design, and closure type for drums. A drum coded with three characters uses the first character to identify the container type (drum), the second to indicate the material/design (steel), and the last to specify the closure (head) type, where 1 means a non-removable head. So the code 1A1 designates a steel drum with a non-removable head. Codes with a different final digit would indicate a removable head, and other first/second characters would point to different container types or materials, so they wouldn’t describe a steel drum with a non-removable head. This coding helps ensure the correct packaging is used and easily checked during transport.