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Which of the following insulations slows down the radiation losses?

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in Casting-Forming-Welding I by (687k points)
Which of the following insulations slows down the radiation losses?

(a) Insulation powder

(b) Insulation sleeve

(c) Insulation pad

(d) Insulation clip

I have been asked this question by my school teacher while I was bunking the class.

My question comes from Types of Risers topic in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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The correct option is (a) Insulation powder

The best I can explain: Insulation powder is used for slowing down the process of retardation of radiation losses from the surface of the metal in the riser.

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