the invention relates to the field of biological chemistry , and to polysaccharides in particular . specifically , it concerns biological products obtained as a result of the polymerization and crosslinking in an alkaline medium of a gel , comprised of wheat or spelt wheat flour , in the presence of a dual - function crosslinking reagent . the invention further relates to a process for obtaining said biological products , consisting in forming an aqueous dispersion of flour , rendering this dispersion alkaline by adding an alkaline metal hydroxide , performing polymerization and crosslinking in the presence of a dual - function crosslinking reagent , and drying the resultant gel to obtain a vitreous , lightly colored product with a solid substance content of between 75 % and 85 % which is then ground into hard particles of a predetermined size . the application of the invention is abrasive particles .