The manufacture of heavy chemicals such as but not limited to mineral acids or other corrosives, ammonia, chlorine, bleaching powder, caustic soap, sulfurous, sulfuric, nitric, carbolic or hydrochloric acid; the manufacture of basic or semifinished chemicals, such as cellulose products, resins, dye stuffs, glue, vegetable, animal or mineral fats or oils, explosives, fireworks, combustible gases, soaps and detergents, fertilizers, asphalt and tar products; the manufacture or production of metals and alloys in ingot form.