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Silica is combined with _______ to increase hardness and durability in glass.

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in Food Packaging Technology by (63.0k points)
Silica is combined with _______ to increase hardness and durability in glass.

(a) boron

(b) alumina

(c) lead

(d) alkali flux

This question was posed to me in semester exam.

My question is from Glass as Packaging Material in chapter Glass Packaging Materials of Food Packaging Technology

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The correct answer is (b) alumina

Easy explanation: Silica is combined with alumina to increase hardness and durability in glass. Glass contains around 1.5%–2% alumina (Al2O3).

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