Chemical products and preparations consisting of minerals, mineral acids, calcium carbonate, calcium carbonate suspension, cationic polymers, hydrosoluble polymers, polymer dispersions, polymer solutions, chemical additives and combinations thereof, for use in providing chemical barriers against oil, grease, water, vapour, gas, smell, solvents, plastifiers, oxygen, fat and aroma; minerals; mineral filtering material for industrial use; mineral acids; calcium carbonate; calcium carbonate suspension; cationic polymers; hydrosoluble polymers; polymer dispersions; polymer solutions; chemical additives for the manufacture of chemical barriers against oil, grease, water, vapour, gas, smell, solvents, plastifiers, oxygen, fat and aroma; pigments for the manufacture of chemical barriers against oil, grease, water, vapour, gas, smell, solvents, plastifiers, oxygen, fat and aroma; pigment siccatives; pigments for use in providing chemical barriers against oil, grease, water, vapour, gas, smell, solvents, plastifiers, oxygen, fat and aroma.