Granite is mainly composed of quartz, mica, feldspar and other minerals, with a Mohs hardness of about 6.5. Although it is hard, it is prone to weathering and wear after long-term use, especially when it is often exposed to water. At this time, there are a small number of concave pits on the surface of the stone, and it feels bumpy when touched by hand. When the pits continue to increase, the brightness of the granite surface decreases and loses its original luster. At this time, it is necessary to restore the luster of the stone through renovation.
However, there are often many problems after granite renovation. One of the most common problems is that the polishing does not reach a shiny gloss after renovation. Many people think that the polishing agent is not good, and it can be polished by changing the agent, but it still does not shine after changing the agent. What’s the matter? In fact, the renovation project of granite should have corresponding requirements for various aspects such as construction process, machinery and equipment, and materials. No matter which aspect is not operated according to the specifications, it is difficult to shine after renovation.
Why is the granite not Shiny?
- We need to consider whether the granite has been treated with stone protective agent during the entire construction process, especially whether the stone protective agent has been applied before water grinding.
If the protective agent is not applied, water will enter the stone during grinding, which will not only cause the problem of poor polishing, but also bring other problems such as water spots and rust. In addition, solvent-based protective agent should be applied before the polishing process. If it is not applied, it will also affect the polishing effect.
- It is necessary to analyze whether there is a phenomenon of chip skipping during the granite renovation process. There are two cases of chip skipping here. One is that the number of grinding discs is not increased step by step in sequence. For example, if 500# is directly ground after 150#, and the middle 300# is omitted, this will not only affect the effect of later polishing, but also cause the problem of color not being restored if 300# is omitted for dark granite.
The second case of chip skipping refers to the use of renovation hard discs when cutting the cut in the early stage, and water grinding discs for fine grinding in the later stage. In this way, the scratches left by the early cut cannot be eliminated, which will cause poor polishing in the later stage.
- Water is not absorbed in time during the renovation process. This problem is often easily overlooked. If water cannot be absorbed after each grinding, the scratches cannot be completely eliminated after grinding, which directly affects the subsequent polishing.
