+ CHECK THE PRODUCTS AND CUSTOMERS OR SUPPLIERS OF REFRACTARIOS NACIONALES SOCIEDAD ANONIMA
| Description | HS CODE |
| Kaolin and other kaolinic clays, including calcined... | 2507 |
| Other clays (not including expanded clays of heading No 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths... | 2508 |
| Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure... | 2519 |
| Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulphate) whether or not coloured, with or without small quantities of accelerators or retarders... | 2520 |
| Portland cement, aluminous cement, slag cement, supersulphate cement and similar hydraulic cements, whether or not coloured or in the form of clinkers... | 2523 |
| Aluminum ores and concentrates... | 2606 |
| Tar distilled from coal, from lignite or from peat, etc... | 2706 |
| Hydrogen, rare gases and other non-metals... | 2804 |
| Other inorganic acids and other inorganic oxygen compounds of non-metals... | 2811 |
| Artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide... | 2818 |
