How to evaluate the quality of granite grinding and polishing

The gloss of the decorative stone is an important standard to evaluate the quality of stone. On the one hand, the size of the gloss depends on the size of the refractive index of various minerals, on the other hand, closely related to the microstructure of the stone surface.

With a granite stone its mineral content is certain, surface is smooth, concave and convex defects was less, glossiness of stones is higher. The microstructure of the stone surface is determined by the quality of grinding and polishing. So, in the purchase of granite flooring, the stone grinding polishing is crucial to distinguish the quality. If you don't have some skills, it is a very difficult task to distinguish the quality of grinding, because in our eyes, all the surface of the stone is bright as a mirror. However actual after grinding and polishing the surface decorative stone no matter what seems light bone, the microscope magnified the microstructure is rough, sometimes even in the presence of larger defects.

Appears to the naked eye is as smooth as a mirror of the granite stone surface, under the reflecting microscope and scanning electron microscope can see the stone surface are left after grinding and polishing in the pits, and striations. These pits and streak some is caused by defects of the mineral itself in the current processing conditions cannot be overcome, some of it is because in the process due to the grindstone thickness grade is not reasonable or grinding polishing is not completely caused.

To observe these very minor defects, we need to be very careful and meticulous, but also to grasp a certain way. We have processed stone surface toward the sun light or fluorescent lamp, observe the reflective surface can be clearly identified as shown in the various pits and streak. For those irregular small pits may is mineral some defects caused by stone composition, can not to consider,tile and if you find some regular streaks on the surface of the stone is caused due to the poor quality in processing, the purchase should try to avoid this kind of stone.