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Silica is combined with lead in glass due to which of the following reasons?

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in Food Packaging Technology by (63.0k points)
Silica is combined with lead in glass due to which of the following reasons?

(a) Reduce the leaching of sodium

(b) Hardness and durability

(c) Clarity and brilliance

(d) Preventing the glass from dissolving in water

The question was posed to me in an interview for job.

My enquiry is from Glass as Packaging Material in section Glass Packaging Materials of Food Packaging Technology

1 Answer

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Best answer
Right choice is (c) Clarity and brilliance

Explanation: Silica is combined with lead in glass as lead provides clarity and brilliance to glass. Silica is combined with other raw materials in various proportions for the following reasons-

Alumina increases hardness and durability.

6% boron reduces the leaching of sodium.

Calcium and magnesium carbonates (limestone and dolomite) acts as stabilizers, preventing the glass from dissolving in water.

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