Which description matches Blow Moulding?

• A. Extraction moulding is used for thin films.
• B. Compression moulding is used to create hollow bottles.
• C. Injection moulding heats plastic and injects into molds.
• D. Blow moulding is used to manufacture hollow plastic products.

Answer: (D)

Blow moulding forms hollow plastic parts by inflating a heated plastic tube inside a mold until it takes the shape of the cavity. This makes it ideal for hollow items like bottles and containers, which is why the description that matches blow moulding is that it is used to manufacture hollow plastic products.

The other descriptions refer to different processes: injection moulding heats plastic and injects it into a mold to form parts (not by blowing air), compression moulding presses preheated material into a mold (often for solid or thermoset parts), and extrusion is used to make films, pipes, or continuous profiles rather than hollow bottles formed by blowing.