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Which method of forming cannot be used to produce sheet glass?

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in Engineering Material & Metallurgy by (773k points)
Which method of forming cannot be used to produce sheet glass?

(a) Floating

(b) Rolling

(c) Drawing

(d) Casting

The question was asked during an online interview.

The doubt is from Glass Production and Processing in portion Glass & Elastomers of Engineering Material & Metallurgy

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The correct choice is (d) Casting

For explanation I would say: In drawing operation, the glass is derived from a molten mixture and is passed through the rollers, where it is passed between cooled rolls. In floating operation, the molten glass is formed into a sheet. Any of these three operations may be performed to manufacture sheet glass.

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