2399Other Non-Metallic Mineral Product Industry

manufacture of grinding stones, whetstones, grinding wheels and the like, without frames, for grinding, sharpening, leveling or cutting, as well as polishing and polishing stones; | manufacture of natural or artificial abrasive powders or grains attached to base materials such as textiles, paper, cardboard, or other materials, whether cut to shape, sewn, or otherwise processed; | manufacture of friction materials and frameless goods with mineral or cellulose substances as the main material; | manufacture of mineral insulating materials, such as slag wool, rock wool and other types of wool; exfoliated vermiculate, expanded clay (created) and similar heat insulating, sound-absorbing materials; | manufacture of goods from various mineral substances, such as mica and mica goods, peat goods as a burning material, graphite goods (except electrical goods); | manufacture of goods from asphalt or similar materials; | manufacture of carbon and graphite fibers and their derivative products (except electrodes and electrical equipment); manufacture of artificial corundum. This subclass also includes | manufacture of calcined kaolin; | drying and grinding of clay into clay powder; | manufacture of products from the purification of non-metallic minerals.