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Reference.org
Boron trioxide
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<p>Boron trioxide or diboron trioxide is the <a href="/facts/Boron_oxide/Srmb8eJf">oxide of boron</a> with the formula B2O3. It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide or boria. It has many important industrial applications, chiefly in ceramics as a <a href="/facts/Ceramic_flux/f0rj9baE">flux</a> for glazes and enamels and in the production of <a href="/facts/Glass/hezRsAGf">glasses</a>. </p>