In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?(a) Ethyl silicate(b) Sodium silicate(c) Both Ethyl and Sodium silicate(d) Neither Ethyl nor Sodium silicateI got this question by my college director while I was bunking the class.This interesting question is from Special Casting Techniques in section Special Casting Techniques of Casting-Forming-Welding I

In precision investment casting, to make the mould the prepared patter

1.	In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?(a) Ethyl silicate(b) Sodium silicate(c) Both Ethyl and Sodium silicate(d) Neither Ethyl nor Sodium silicateI got this question by my college director while I was bunking the class.This interesting question is from Special Casting Techniques in section Special Casting Techniques of Casting-Forming-Welding I
Answer» Right option is (c) Both Ethyl and Sodium silicate To EXPLAIN I would SAY: The SLURRY in which prepared pattern is dipped into is MADE by suspending FINE ceramic particles in ethyl silicate or sodium silicate.

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