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

an-insulating-material-named-85-magnesia-can-be-used-up-to-temperatures

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

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.