The manufacture of heavy chemicals such as, but not necessarily limited to, acids or other corrosives, ammonia and caustic soda; the manufacture of basic or semi-finished chemicals such as, but not necessarily limited to, cellulose products, resins, dyestuffs, glues, vegetable, animal or mineral fats or oils, explosives, soaps and detergents, fertilizers, combustible gases and asphalt and tar products; the manufacture or production of primary metals or alloys in ingot or stock form; the manufacture or production of cement, plaster and their constituents, matches, paints, linoleum and oilcloth, rubber and rubber products.