In recent years, due to the deterioration of the natural environment, dust, industrial waste gas, automobile exhaust gas, acid rain, and other pollutants have caused great pollution to the stone used in construction. In our surroundings, we often see the beautiful building "flower face" impregnation, the new square did not last long rust wet mottled, this is due to the protection of the stone did not keep up with.

Yan Keming, chairman of the China Building Decoration Association Material Committee, said that since the stone itself has capillary pores and water absorption, it is easy to absorb some things and easily cause pollution.

It is understood that dust, sour gas and exhaust gas in the air will accumulate on the surface of the stone day by day. Acid rain will accelerate the erosion of these stones on the stone and absorb it in the capillary pores of the stone, causing unclean stains, especially for the burning surface. In terms of stone, these pollutions are formed at a faster rate and the smooth stone will be eroded quickly.

Li Yongqiang, engineer of the National Center for Building Materials Industry Bureau Stone Quality Monitoring Center, once told the media that the cause of stone disease was the result of internal and external factors. Unstable chemical composition in natural stone, capillary action of naturally occurring micropores, surface adsorption, and chemical or physical changes in the surrounding environment (atmosphere, water, acid rain, cement, or other contaminants) can make stone sick. Rust, wet spots, oil spots, salt spots, spit powder and other stone “disorders” not only add to the user's troubles, but also unsightly.

In the previous use of stone, there was very little protection. Therefore, stone generally lacked care. According to Zeng Yanxing, sales director of Shandong Xinfu Industry Co., Ltd., in addition to a complete structural design, the maintenance of the entire exterior cannot be overlooked in a modern building. The application of domestic stone in the interior and exterior of the building is becoming more and more common. The maintenance of the stone should also increasingly attract attention from architects, construction companies and owners.