Which of the following is not used as binders for mould materials?(a) Bentonite(b) Kaolinite(c) Backelite(d) IlliteThe question was posed to me by my college director while I was bunking the class.This question is from Mold Materials topic in section Molding and Core Sands of Casting-Forming-Welding I

Which of the following is not used as binders for mould materials?(a)

1.	Which of the following is not used as binders for mould materials?(a) Bentonite(b) Kaolinite(c) Backelite(d) IlliteThe question was posed to me by my college director while I was bunking the class.This question is from Mold Materials topic in section Molding and Core Sands of Casting-Forming-Welding I
Answer» The correct answer is (c) Backelite Explanation: Backelite is a MATERIAL which increases hardness BEYOND a limit which is ACCEPTABLE for mold materials as well as its DEFORMATION takes place too early as plastic deformation. Hence, it is not used as a binder.

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