In shell moulding sand preparation, the resin is combined with a catalyst (hexa) to develop the_____(a) thermoplastic characteristics(b) toughness of the resin(c) thermosetting characteristics(d) viscosity of the resinThis question was addressed to me at a job interview.My doubt is from Shell Moulding in division Special Casting Techniques of Casting-Forming-Welding I

In shell moulding sand preparation, the resin is combined with a catal

1.	In shell moulding sand preparation, the resin is combined with a catalyst (hexa) to develop the_____(a) thermoplastic characteristics(b) toughness of the resin(c) thermosetting characteristics(d) viscosity of the resinThis question was addressed to me at a job interview.My doubt is from Shell Moulding in division Special Casting Techniques of Casting-Forming-Welding I
Answer» CORRECT option is (c) thermosetting characteristics The explanation is: The phenolic resins used in shell moulding have EXCESS of phenol and acts like a thermoplastic MATERIAL. During coating with sand the resin is mixed with a catalyst such as hexa METHYLENE tetramine (hexa) in a proportion of 14 to 16 % so as to DEVELOP the thermosetting characteristics.

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