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First, a brief definition of MgO by Robert Thomas:
Magnesium oxide board “MgO board” is a factory-made, non-insulating sheathing board product. It can be used for a number of applications including wall and ceiling linings, fascias, soffits, tile backing and underlayments. It is made of magnesium oxide, a type of mineral cement, and is commonly called simply “MgO” (pronounced emm-gee-oh) due to its chemical composition of magnesium (chemical symbol Mg) and oxygen (chemical symbol O). Think of MgO as a type of sheathing board–sort of like drywall or cement board–but with much-improved characteristics such as fire resistance, weatherability, strength, resistance to mold and mildew, and so on.
From his definition we know that MgO shares many characteristics with the paper honeycomb in terms of its resilience to external elements. When both materials are combined, we obtain the same structural makeup as a SIPS panel, which lends itself to the same structural characteristics as well. Other interesting tidbits include its environmental friendliness compared to its competitors, and its track record in terms of usage. MgO in some form has been used since ancient times, seeing use in structures such as the pyramids and the Great Wall of China. Seeing those structures standing today is a possible testament to the useful potential of MgO.
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