Before use, all packaging intended to hold liquids must be submitted to which type of testing?

• A. Visual inspection only
• B. Pressure testing only
• C. Dye penetration testing
• D. Leak proof testing

Answer: (D)

The key idea is that packaging meant to hold liquids must actually contain the liquid without leaking. Leak proof testing directly checks whether the container, its seals, and closures prevent any leakage under the conditions it will encounter during use and transport. Visual inspection only looks at appearance and can miss hidden leaks; pressure testing might show whether the container can withstand internal or external forces but doesn’t guarantee no leakage; dye penetrant testing detects surface cracks but isn’t a reliable method for confirming complete containment. Therefore, the appropriate test is one that verifies there is no leakage, confirming the packaging is truly leak-proof.