Glass is made up of cheap and plentiful raw materials, however large amounts of these materials are required to produce new glass.
Glass is made up from a mixture of Sand (72%), Soda Ash (14%) and Limestone (12%). These raw materials are melted in a furnace at more that 1500°C which requires large amounts of energy.
Using Cullet (recycled glass) saves the energy required to extract and deliver these raw materials.
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