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One of our earliest industrial containers, glass is made by melting sand, soda ash, limestone, and cullet (recycled crushed glass) in furnaces heated to 2,700 degrees Fahrenheit.
It goes without saying that the broken glass or cullet used had to be of the required colour or clear, so that no expensive new minerals were added to colour it.
For some purposes, it is possible to make glass entirely of cullet .
Approximately 80 per cent of the glass now being made in Irish Glass is from cullet or recycled glass.
Ireland does not have another manufacturing facility with a similar capacity to absorb glass cullet (crushed glass).
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