De-inking sludge is comprised mainly of inorganic mineral fillers, short cellulosic fibres and fines (micro fibres), coating polymers and ink particles. Less socially elevated uses are concrete, brick making and energy production. Re-engineered using Zelfo Technology’s process the material becomes clay like, reforming when pressed into a granite-like material. Across the surface are organic blooms and dark flecks which betray the origins of the material as being from a non-rock like source.

Initial products have been produced using Leipa Group de-inking sludge.