Question

Which of the following materials is not used in flexible molds?

• A. Latex
• B. Korogel
• C. Gelatin
• D. Gel Coat

Hint:

Distinguish between the material that forms the body of the mold (which needs to be flexible) and surface coatings (like a gel coat) that provide a high-quality finish to the cast part.

Answer 1

The Correct Option is D

Step 1: Understand the function of a flexible mold. Flexible molds are used to cast objects with complex shapes and undercuts, as the mold can be bent or peeled away from the cast object. Materials like latex, silicone, and gelatin are used for this.
Step 2: Evaluate the function of a Gel Coat. A Gel Coat is not the mold material itself. It is a specialized resin applied to the surface of a mold (typically a rigid mold, like fiberglass) before casting. It becomes the smooth, hard outer surface of the final cast object and is not flexible in the way a mold material is.