1. Brazilian Standard NBR 7181 – Soil: Granulometric Analysis,1984
2. Brazilian Standard NBR 10005 – Leaching Test Procedure,2004
3. Brazilian Standard NBR 10006 – Solubilization Test Procedure,2004
4. Brazilian Standard NBR 10004 – Solid Wastes: Classification,2004
5. ASTM C373 – Test Method for Water Absorption, Bulk Density, Apparent Porosity, and Apparent Specific Gravity of Fired Whiteware Products,1994