Metallographic sandpaper is a special sandpaper used for grinding in metallographic analysis in physical laboratories. The following is a detailed introduction to its models and coarseness:
1. Models of metallographic sandpaper
The models of metallographic sandpaper are usually divided by the size or mesh of its abrasive particles. Common models include:
01# (20~28μm): coarse grinding level
02# (14~20μm): medium coarseness
03# (10~14μm): finer grinding level
04# (7~10μm): fine grinding level
05# (5~7μm): very fine grinding standard
In addition, there are models divided by particle size, such as P80-P320 for coarse grinding, P400-P800 for medium grinding, P1000-P2000 for fine grinding, and P2400-P7000 for fine grinding. Or they can be distinguished by particle sizes such as w5(06), w7(05), w10(04), w14(03), w20(02), w28(01), w40(0#), w50(1#). And the common models such as 400#, 600#, 1000#, 1200#, 1500#, 2000#.
2. The coarseness of metallographic sandpaper
The coarseness of metallographic sandpaper is directly related to the size of its abrasive grains. The larger the abrasive grains, the coarser the sandpaper; the smaller the abrasive grains, the finer the sandpaper. Coarse sandpaper is suitable for coarse grinding and removing a large amount of metal materials, while fine sandpaper is suitable for fine grinding and polishing.
3. Other precautions
Metallographic sandpaper is also divided into water-resistant sandpaper and dry sandpaper. Water-resistant sandpaper is suitable for metallographic grinders and is usually cut into circles. The diameter varies depending on the grinder model. Dry sandpaper is not water-resistant and will break when ground with water. It is usually used for polishing and wear resistance of graphite products.
The uniformity and hardness of the sand grains, as well as the thickness and density of the paper, will also affect the grinding effect and life of the metallographic sandpaper. The sand grains of high-quality sandpaper should be evenly distributed on the surface of the paper, with moderate hardness, and the thickness and density of the paper should also meet certain requirements.
When selecting metallographic sandpaper, in addition to considering its model and thickness, factors such as the original state of the sample and the characteristics of the material, the requirements of subsequent metallographic analysis, and the transition and coordination of the grinding stage should also be considered.
In summary, the models and thickness of metallographic sandpaper vary, and the selection should be determined according to the specific use requirements and the characteristics of the sample.