Which of the following non-metallic material is not used in the synthesis of molds?(a) Magnesite(b) Silimanite(c) Zircon(d) Valcanised rubberI have been asked this question by my school principal while I was bunking the class.I would like to ask this question from Mold Materials topic in chapter Molding and Core Sands of Casting-Forming-Welding I

Which of the following non-metallic material is not used in the synthe

1.	Which of the following non-metallic material is not used in the synthesis of molds?(a) Magnesite(b) Silimanite(c) Zircon(d) Valcanised rubberI have been asked this question by my school principal while I was bunking the class.I would like to ask this question from Mold Materials topic in chapter Molding and Core Sands of Casting-Forming-Welding I
Answer» Right option is (d) Valcanised rubber The explanation: Valcanised rubber has a very low REFRACTORINESS, hence, using valcanised rubber for making molds can cause damage to the mold CAVITY or METALLIC structure so formed.

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