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An insulating material named 85% magnesia can be used up to temperatures of _______

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An insulating material named 85% magnesia can be used up to temperatures of _______

(a) 120^oC

(b) 250^oC

(c) 315^oC

(d) 460^oC

This question was posed to me in an online interview.

Question is taken from Properties of Insulation topic in division Magnetic & Insulating Materials of Engineering Material & Metallurgy

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Correct answer is (c) 315^oC

The best explanation: 85% magnesia is a commonly used insulating material for industrial applications. It contains 85% magnesium carbonate along with 15% asbestos fiber. It can be used for covering surfaces up to 315^oC.

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