What is meant by secondary labeling and when should it be used?

What is meant by secondary labeling and when should it be used?

• A. Labels affixed to primary containers only
• B. Labels affixed to shipping documents
• C. Labels affixed to secondary containers or decanted materials to ensure hazard information is conveyed when transferring chemicals
• D. Labels are optional for decanted materials

Answer: (C)

Placing labels on secondary containers or decanted materials is the practice that ensures hazard information is visible where the chemical is actually used. When a chemical is moved from its original container into another vessel for use, the original label may no longer apply to the new container, so a fresh label keeps identity, hazards, and safe-use instructions clear for everyone handling it. A proper secondary label should identify the chemical, include hazard pictograms or statements, specify any precautions, and usually note the date and who decanted it. This approach aligns with hazard communication standards, helping prevent mix-ups and reducing the risk of improper handling in the workspace. Labels on shipping documents don’t substitute for on-site container labeling, and labeling primary containers or making labeling optional for decanted materials don’t reliably convey critical information in the moment of use.