SPECIFICATION CRITERIA/SUGGESTED USES

As already emphasized, aggressive chemical substances, over all the acidulous ones, are more and more present in our environment. Its incidence comes mainly from anthropogenic actions, involving manipulation of domestic and industrial products, and from acid rains produced by the burning of fossil fuels (coal, oil, etc.).

Areas not polluted by anthropogenic sources, such as swamps, quagmires, and volcanic areas can also generate acid composites due to the natural emissions of sulfur (SO2). Likewise in tropical regions, acid rains can be generated by the atmospheric contamination by organic acids (carboxylic), once vegetation is an important natural source of emission of hydrocarbons.

From these references and elements for analysis, collected through works simulating alterations, it becomes strengthened the need for a conciliation between aesthetic and technique, in order to reach specification and adequacy for the use of ornamental stones and covering.

First of all, it is necessary to distinguish the carbonate stones, appointed generically as marbles and travertine, from the silicate and siliceous stones, denominated granites and quartzites .