Question time . . . . MgO

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Unit 6 Topic 5
Oxide Qualities
Which of the following qualities make MgO a very useful oxide for controlling crazing in high temperature glazes?
The oxide MgO has a very high surface tension.

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MgO has one of the lowest coefficients of expansion.
MgO melts very late in the firing process.
If sourced from dolomite CaO is included in the melt.
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