Suggest one reason why magnesium oxide is used to line the inner surface of a furnace.

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ndnordic | High School Teacher | (Level 2) Associate Educator

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Because it retains its strength at very high temperatures. It is considered a refractory material with a melting point of 6500 degrees F.  It is also very non-reactive with other materials that might be put into the furnace and is even used to make crucibles - containers used to melt other substances.