Abstract: The invention teaches a mixed product of organic and inorganic particulate materials in a substantially homogeneous matrix. The invention has organic and inorganic particulate materials form an essentially homogeneous matrix, wherein with respect to the dry weight 75 to 85 weight %, preferably about 82 weight % of the basic material are substantially free of metallic material and that the remainder is additive materials (additives), and wherein 80 to 90 weight %, with respect to the dry total quantity of additive materials, comprise clay, inclusive of bentonite, zeolite and lime, and whereby the remainder is lignin and/or lignin derivatives, and that the particle size is appropriate to the matrix developing material between 50 ?m and for 3 mm.