1 chemical preparations in the nature of inorganic filtering materials for use in the food-processing, bio-industry, chemical, pharmaceutical and petrochemical industries; mineral substances in the nature of inorganic filtering materials for use in the food-processing, bio-industry, chemical, pharmaceutical and petrochemical industries; unprocessed plastics in the nature of inorganic filtering materials for use in the food-processing, bio-industry, chemical, pharmaceutical and petrochemical industries; inorganic ceramic particles for use as a filtering media for use in the food-processing, bio-industry, chemical, pharmaceutical and petrochemical industries