Question:
The slurry used in precision investment casting is made up of
The slurry used in precision investment casting is made up of
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Investment casting slurry uses {silicate binders} to provide strength and heat resistance to the ceramic shell.
Updated On: Feb 8, 2026
- Zinc stearate
- Stearic acid
- Both Ethyl and Sodium silicate
- Neither Ethyl nor Sodium silicate
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The Correct Option is C
Solution and Explanation
Step 1: Understanding precision investment casting.
Precision investment casting, also known as lost wax casting, involves coating a wax pattern with a refractory slurry to form a ceramic shell. This slurry must provide strength and thermal resistance.
Step 2: Composition of slurry.
The slurry typically consists of fine refractory materials mixed with binders. Ethyl silicate and sodium silicate are commonly used binders because they provide good bonding and strength to the ceramic shell.
Step 3: Eliminating other options.
(A) Zinc stearate: Used as a lubricant or release agent, not as slurry material.
(B) Stearic acid: Used in wax patterns, not in ceramic slurry.
(D) Neither Ethyl nor Sodium silicate: Incorrect, as silicates are essential binders.
Step 4: Conclusion.
Therefore, the slurry used in precision investment casting is made up of both ethyl silicate and sodium silicate.
Precision investment casting, also known as lost wax casting, involves coating a wax pattern with a refractory slurry to form a ceramic shell. This slurry must provide strength and thermal resistance.
Step 2: Composition of slurry.
The slurry typically consists of fine refractory materials mixed with binders. Ethyl silicate and sodium silicate are commonly used binders because they provide good bonding and strength to the ceramic shell.
Step 3: Eliminating other options.
(A) Zinc stearate: Used as a lubricant or release agent, not as slurry material.
(B) Stearic acid: Used in wax patterns, not in ceramic slurry.
(D) Neither Ethyl nor Sodium silicate: Incorrect, as silicates are essential binders.
Step 4: Conclusion.
Therefore, the slurry used in precision investment casting is made up of both ethyl silicate and sodium silicate.
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