Performed on all kinds of packaging's that are intended to contain liquids, must be held under water for 5 minutes while internal air pressure is applied.

• A. Water Immersion Test
• B. Hydrostatic Test
• C. Leak-Proof Test
• D. Submersion Test

Answer: (C)

The test being described checks the seal integrity of packaging intended to hold liquids. By applying internal air pressure and holding the package under water for several minutes, any leaks at closures or seams will produce bubbles, making breaches visible. This directly assesses whether the package is capable of staying leak-tight under conditions it might encounter during handling and transport, which is the essence of a leak-proof test. Other options don’t combine internal pressurization with water submersion to reveal leaks in the seals specifically, so they don’t target the same failure mode.