1 Chemical products and preparations, namely aluminium, silicon, refractory and ceramic powders used in the petro-chemical, steel making and refining industries; chemical preparations, namely aluminium, silicon, refractory and ceramic powders used to repair coke, glass, non-ferrous metals, ceramics; chemical preparations, namely aluminium, silicon, refractory and ceramic powders used to repair and maintain furnace and refractory lining, furnaces, ovens, kilns, ladles and machinery used in metallurgical, smelting and processing industries