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Manufacturing curved glass is a time-consuming, highly specialised job. You could almost say it's a ‘pane' to produce. Workers cut the sheet of glass to size and then clean and polish it, using a UV lamp to check for dust or impurities (any rogue particles would cause the glass to crack or shatter). They construct a steel mould shaped to the curve radius and dimensions of the desired piece. To stop the pane sticking to the mould, the glass is painted with a mixture of detergent and calcium carbonate. http://www.curvedglasssupplier.com/curved-glass/