If regular ice is used as a coolant in packaging for dangerous goods, which statement is true?

• A. It must be kept away from any metal components
• B. It must be heated before use
• C. It must be used only if the packaging is not labeled as DG sealed
• D. It must not affect the packaging integrity

Answer: (D)

Regular ice as a coolant is acceptable only if it does not compromise the packaging. The purpose of the coolant is to keep the contents within the required temperature range, but the packaging must stay leakproof and structurally intact throughout transport, even as the ice melts. If melting ice or contact with the contents causes water ingress, pressure changes, or damage to seals or materials, that would mean the packaging no longer meets safety requirements. So the true statement is that the coolant must not affect the packaging integrity.