Question

What are the releasing agents of moldcast
(A) Polyester resin
(B) Liquid detergent
(C) Oil
(D) Slip
(E) Resin
Choose the correct answer from the options given below:

• A. (A) and (B) only
• B. (B) and (E) only
• C. (A), (E) and (C) only
• D. (B), (C) and (D) only

Hint:

A releasing agent is anything that creates a barrier between the mold and the casting. Think of it like greasing a cake pan: common household items like soap or oil often work.

Answer 1

The Correct Option is B

Step 1: Define a "releasing agent." A releasing agent (or mold release) is a substance applied to the inside of a mold to prevent the casting material from sticking to it, thus facilitating easy removal.
Step 2: Evaluate the options as releasing agents.

(A) Polyester resin & (E) Resin: These are casting materials, not releasing agents. They are what you pour into the mold.
(B) Liquid detergent: A dilute solution of liquid soap is a common, simple releasing agent for plaster casting.
(C) Oil: Various oils (like petroleum jelly, mineral oil, or specialized mold release oils) are widely used as releasing agents.
(D) Slip: This is liquid clay used in ceramics, primarily for joining pieces or for decoration, not as a general mold release for other materials.

Step 3: Identify the correct agents. The true releasing agents on this list are (B) Liquid detergent and (C) Oil. Since no option contains only (B) and (C), there is an error in the question's choices.