1. Refractory all different kinds of stone, some stone in the high temperature, chemical decomposition.
(1) gypsum: decomposition at higher than 107 ℃.
(2) limestone, marble: decomposition at higher than 910 ℃.
(3) at 600 ℃ granite: mineral composition of heat due to uneven.
2. The expansion and contraction of stone is also the thermal expansion and contraction, but if the heat and then cooling, the contraction can not be restored to its original volume, and will be retained as part of a permanent expansion; the United States Arsenal have tested from 0 ℃ to 100 ℃, then dropped to 0 ℃, measure permanent expansion increased the degree of 0.02 - O.045%.
3. The resistance to freezing freezing to minus 20 Celsius,, expansion of water within the pore volume than the original large 1/10, if the rock can not resist the power of this expansion occurred, there will be destruction of the phenomenon. Generally if the water absorption rate of less than 0.5%, do not take into account their frost resistance.
4. The compressive strength, the compressive strength of stone because of mineral composition, crystal thickness, cement material uniformity, loading area, loading and cleavage angle of the other factors, and different. If other conditions are the same, usually small crystalline particles bonded with each other dense materials, high strength. Dense volcano rocks in dry and saturated water, the compressive strength did not differ (very low water absorption), if they are afraid of the water of the porous and cemented rock, the strength of its dry and wet, there are significant differences.
Decorative stone building with natural stone and artificial stone two categories, mainly from natural stone, it is a kind of high-level decorative materials, mainly used for decorative projects that require high levels, artificial stone decoration materials are low grade, low, only for the interior decoration engineering.
Natural stone is mined from natural rock, and into a block or plate material of the general processing. Architectural decorative Yao natural stone granite and marble are mainly two kinds of.
The so-called marble is the deposition or metamorphic carbonate rocks, Dali rock, dolomite, limestone, sandstone, shale and slate. As China's famous Beijing white marble is dolomite produced in Fangshan, Yunnan marble is produced in Dali County of marble, the famous Dandong green is serpentinized skarn. Similarly, as the various magmatic rocks stone mining, such as granite, andesite, diabase, long green rock, called granite gneiss. Such as Beijing white tiger Jian white granite is granite, Ji'nan green gabbro, Qingdao black granite is diabase.
Artificial stone is a synthetic decorative materials. In accordance with the different binders, can be divided into organic and inorganic man-made stone artificial stone two. According to the different production process, can be divided into polyester artificial marble, artificial marble, composite silicate artificial marble, artificial marble, four types of sintering.
There is a call the small Blaupunkt granite, also known as the Pingnan G654. Blaupunkt is a stone products development zone Pingnan county road for the new development. Small sapphire material with a small blue point is also known as "blue star". Imports because of spirit likeness "rime ice", it has made "rime ice" name. Mainly used for the external walls, countertops, outdoor plaza (fire board). Is an architectural decoration Jiapin four kinds of artificial stone decorative material, in organic (polyester) are most commonly used, its physical, chemical properties are the best.
