Why is magnesium oxide used to line industrial ovens?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Magnesium oxide (MgO) is a compound of a metal and a non-metal. It is held together with double ionic bonds (two positively charged Mg ions bonded with two negative oxygen ions) which makes it non-reactive and tightly bound together. Because of this strong attraction, MgO has a very high melting point of nearly 3,000°C (over 5,000°F), which makes it suitable for lining furnaces, fire-proofing building materials, and for crucibles, those small, white vessels you may have used to melt other substances in your lab. You ask about industrial ovens--in addition to its very high melting point, MgO is also very non-reactive, meaning that when used to line ovens, no particles of MgO will be released from the lining and incorporated into any food baked inside. MgO is also a very strong refractory material; it maintains its structural properties at very high temperatures, again, making it desirable for use when extremely high temperatures are generated.

 

 

 

 

Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial