As a natural substance, radioactive nuclide 40 "such as uranium, radium, thorium and potassium is also one of the components of stone. The higher the radionuclide, the greater the extra radiation the human body receives. The scope of production, sales and use of Class A is not restricted; Class B shall not be used for interior decoration of civil buildings; Class C can only be used for exterior decoration and outdoor of buildings. Experts suggest that the most effective way to prevent radioactive radiation hazards of stone materials is to use tested stone materials.
Marble can be used safely.
Among all natural decorative stone materials, marble, most slates, dark series (including black, blue and dark green) and gray series granite have low radioactive radiation intensity, which can be confirmed as "A-class" products even without any testing, and can be safely and boldly used for home interior decoration and any occasion.
Marble is suitable for TV stations, window lifts and other clean places.
Because there are fine holes on the surface of natural stone, its anti-pollution ability is weak. Generally, its surface will be treated in a processing plant. In interior decoration, marble is suitable for TV cabinets, windowsills and indoor floors. The doorsill, kitchen cabinet countertop and outdoor floor are all suitable for granite. Among them, it is best to use dark granite for the countertops of kitchen cabinets.
Some colors of natural stones on the market now are artificially processed, and these stones will show their true colors after being used for about half a year. The most obvious thing is that many flowers and greens on the market now are dyed, not real flowers and greens.
Also pay attention to the grid on the back. There are two situations: 1. The stone itself is brittle and must be checked, such as Spanish beige. 2. Jerry-building, the thickness of these stones has been reduced and the strength is not enough, so a grid has been added. Generally, if there is a grid in the dark stone, it is mostly this factor.
Artificial stone materials are suitable for harsh environments.
Artificial stone is made of unsaturated polyester resin as binder, natural marble or calcite, dolomite, silica sand, glass powder and other inorganic powders, as well as a proper amount of flame retardant and pigment. By mixing, casting, vibration compression, extrusion and other methods.
Artificial stone is developed artificially according to the problems in practical use, and has made great progress in moisture-proof, acid-proof, alkali-proof, high temperature-resistant and flat-jointed. Of course, artificial things naturally have artificial shortcomings, and the naturalness of artificial stones is obviously insufficient, so they are mostly used in places with high practical requirements such as cabinets, and less emphasis is placed on windowsills and floors.
Another factor that hinders the use of artificial stones is human factors. Because the manufacturing process of artificial stone is very different, the performance characteristics are not completely consistent. So the performance mentioned above is not necessarily the performance of the artificial stone you bought. At present, the artificial stone imported from the market has good performance, and relatively speaking, the domestic one may just be "blown". Simply put, the scratches on the surface of imported marble are allowed to be polished with sandpaper, so it is no longer obvious for users to handle them themselves, but many domestic artificial stones obviously cannot support this practice, and the worse they are polished.
Artificial stone is suitable for some harsh environments, such as kitchen and bathroom. Because the texture is relatively fake, it is rarely used in decoration projects.
When buying artificial stone, it is best to take a sample for bad test, such as pouring soy sauce or oil stains, for wear test.