The present invention relates to a composite material, particularly a composite material for ceramic tiles, stone cladding, surface tops (e.g. worktops), and the like. The composite materials are typically derived from waste products. The composite materials of the present invention are formed from a glass component and a non-glass mineral component (e.g. ceramics and/or glaze). Generally the composite materials do not require any binders (especially synthetic binders) to hold the materials together. Therefore, the composite materials and products made therefrom are typically recyclable.

Glass-based substrates including recycled content of highly crystalized cullet are disclosed. Also disclosed are methods for manufacturing a recycled glass-based material composition, the method comprising: melting a set of raw materials, the set of raw materials comprising glass-ceramic cullet. The glass-ceramic cullet comprising: a cullet composition comprising SiO.sub.2, Al.sub.2O.sub.3, and Li.sub.2O; greater than or equal to 70% by total weight cullet crystal phase. The melting is performed in a melting vessel held at a temperature, and for a time, sufficient to melt the glass-ceramic cullet to form a re-melted precursor material. The melted precursor material may be used to form a glass-based product which may be transparent or opaque.

Methods for increasing the stability of a slag using a source of silica and a source of boron ions, and compositions for use in said methods.

The present invention relates to a composite material, particularly a composite material for ceramic tiles, stone cladding, surface tops (e.g. worktops), and the like. The composite materials are typically derived from waste products. The composite materials of the present invention are formed from a glass component and a non-glass mineral component (e.g. ceramics and/or glaze). Generally the composite materials do not require any binders (especially synthetic binders) to hold the materials together. Therefore, the composite materials and products made therefrom are typically recyclable.