Which of the following describes a polymer finishing method that adds a second material onto a moulded part?

• A. Over-moulding
• B. Lamination
• C. Foil Blocking
• D. Varnishing

Answer: (A)

Over-moulding describes a finishing process where a second material is injected onto or over a moulded polymer part, creating a single component that contains two different materials. This lets you combine properties like a hard core with a soft, tactile outer layer, or add color and texture in one part. For example, a plastic handle can have a soft grip molded over it in one production cycle.

The other options don’t fit as well. Lamination involves bonding a separate sheet or layer to a surface, rather than moulding a second material onto the part during the forming process. Foil blocking adds decorative foil using heat and pressure, not a second polymer material. Varnishing applies a surface coating, again not introducing a second material into the part.