1、 Price: Stone belongs to natural ore. Due to the difference in quality, quantity, mining area, and processing technology, the price of different grades of stone will be significantly different. It’s best to shop around before buying.
2、 Mastering stone quality.
- Color. In addition to avoiding the use of stones with more obvious color differences, the use of colored stones should also be avoided.
- Composition of stone materials. First, avoid the use of stones containing too much iron sulfide, salt, carbon, clay, etc.; Secondly, avoid the use of stones and thermal conductive minerals with high expansion coefficients.
3、 Age and durability
Stone has a very high position in decorative materials, with irreplaceable decorative properties. It is usually used for the “facade” of the building, so the owner hopes that the stone and the building have the same vitality. Stone with good durability can not only ensure the beauty of buildings but also extend the renovation period of buildings. Therefore, when stone is used as decorative materials for exterior walls, floors, and halls, the following aspects of stone must be studied:
- Physical properties Stone must be able to withstand the damage caused by gravity, wind, vibration, temperature change, wear, load, and many other external forces. This requires high-strength stones, especially those installed in high places.
- Chemical properties Stone must have considerable chemical resistance, such as weathering, hydration, dissolution, dehydration, acidification, reduction, and carbonate. To do this, the stone must be waterproof.
- Structural strength When selecting directional stones such as slate and shale, attention must be paid to the structural strength in different directions.
- The molecular structure of the water absorption ore is relatively stable during mining, but when exposed to the atmosphere, the coordination between the minerals inside the stone is poor. For example, the limestone meets the acid (reaction of sulfurous acid) gas and water in the air, forming calcium sulfate in the dissolution table, which leads to the collapse of the sandstone. Therefore, when selecting stones, we should try to choose stones with uniform aperture distribution, small aperture, and low water absorption.