1.

Which of the following non-metallic material is not used in the synthesis of molds?(a) Magnesite(b) Silimanite(c) Zircon(d) Valcanised rubber

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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