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.