How to choose artificial cultured stone veneer?

Artificial culture stone artificial cultured stone veneer in 2000 by the United States, South Korea Veneer Stone Manufacturers and Suppliers, exports to China. At present, China has no specific quality standards, as the outside wall decoration materials, but it should be consistent with the basic provisions of the relevant aspects of the building materials, exterior materials.
A selection of artistic effects (this is determined by the design institute)
Second, the intrinsic quality of the product
(A) the color aspect
Fade No? (1) the quality of the pigment (American culture stone and domestic brands with Germany "BAIER Bayer pigment, with bargain-made, such as" goods ", the former unit price is several times that of the latter)
(2) color (pigment) and anti-anti-aging? --- Testing standards can refer to the the the national exterior paint anti-aging standard ". GB/T1865
(3) whether the whole body coloring? (American culture stone and domestic brands are quintana coloring)
(B) physical indicators
1, the density ≤ 1.4g/cm3 (finished weight 30kg ~ 50Kg / m.)
2, the compressive strength of the external walls of culture stone is not load-bearing, but the impact of wind, can refer to the C746-1999 "provisions of the concrete tile (not important).
3, the bending strength can press JC/T641 "in the decorative concrete block wall tiles regulations or reference to the flexural strength of the GB wall tiling requirements. (The average flexural strength of the tulip culture stone of 27.6MPa; other big brands 5.12Mpa)
4, antifreeze can reference JC746-1999 "provisions of the concrete tile execution to GB/T6955-1986" ceramic wall and floor tiles frost resistance test methods (many domestic culture stone (at minus 30 ° C to minus 10 ℃ conditions after 50 freeze-thaw was no peeling, no breakage.)
Resistance to artificial aging according to GB/T1865-1997, 150H did not significantly change.
6, water absorption according to GB/T2579-1989 (17% water absorption, protective treatment 2.5%).
7, acid corrosion up to A-level (0.01mol / L hydrochloric acid solution and 0.01mol / L sodium hydroxide solution after dropping stone surface no obvious damage, no mortar blocks falling phenomenon, and to restore to its original state).
8, radioactive GB655 provisions execution (internal exposure index ≤ 0.6Bq/Kg external exposure index ≤ 0.8Bq/Kg).
(C) other indicators
1, the culture stone surface hardness (equivalent wear resistance). The higher, the more wind resistance, less easy to swap the gray.
2, alkali turning any culture stone surface turned base will be difficult to see. (Not 100% not turn alkali culture stone, there must be one hundred percent turn alkali culture stone). Turn alkali is the concrete dealkalization This change of the structure of the concrete, thus affecting the cultural life of the stone.
(4) Description:
Veneer Stone Manufacturers and Suppliers of performance indicators to reach the above criteria, the technology, but relevant:
1, no fully formulated master of raw materials, trade-off.
Material quality level is not enough (and did not find a good manufacturer, the supplier of the information is a commercial secret culture stone manufacturers)
Production problems, or do not put in place.