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Posted by on Sunday, April 28, 2013 at 5:57am.

Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO
Quench the entire sample in water Quench half of the sample in water Cool the entire sample with air jets Cool half the sample with air Submerge the sample in a salt bath of Na2O Submerge the sample in a salt bath of CaO

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