Yes, a higher number on sandpaper indicates a finer grit, which means it will produce a smoother finish.
The roughness of sandpaper is determined by the grit size, which refers to the number of abrasive particles per square inch on the sandpaper. A lower grit number indicates coarser sandpaper with larger abrasive particles, while a higher grit number indicates finer sandpaper with smaller abrasive particles. The grit size affects the level of abrasion and material removal when sanding.
Sandpaper with higher grit is smoother and finer, resulting in a smoother finish but slower material removal. Sandpaper with lower grit is rougher and coarser, allowing for faster material removal but a rougher finish.
Sandpaper comes in different grits, which determine its coarseness. Lower grits (ex. 60) are rougher and more aggressive, while higher grits (ex. 400) are finer and less abrasive. So, the hardness of sandpaper can vary depending on the grit you choose.
The rougher the sandpaper, the more it takes off the material being sanded. The finer the grade (smoother) the smoother the finish will be. Rougher grades are used at the beginning to remove tool marks and shape the material, and you gradually work up to the finer grades for finish work. The very finest grades are used to polish the finish.
The 300 grit sandpaper is finer than the 180 grit. Grit numbers indicate the size of the abrasive particles; a higher number means smaller particles and a smoother finish. Therefore, 300 grit will produce a smoother surface compared to 180 grit, which is more coarse.
The grit number on wet and dry paper refers to the coarseness of the abrasive particles on the sandpaper. A higher grit number indicates a finer abrasive that is suitable for smoothing and finishing surfaces, while a lower grit number is more coarse and used for removing material quickly.
The rougher the sandpaper, the more it takes off the material being sanded. The finer the grade (smoother) the smoother the finish will be. Rougher grades are used at the beginning to remove tool marks and shape the material, and you gradually work up to the finer grades for finish work. The very finest grades are used to polish the finish.
Traditionally, sandpaper was made of paper impregnated with tiny crystals of quartz or garnet. The finer the particles, the smoother the sandpaper was. While that type of sandpaper is still widely available, most modern sandpaper is made with aluminum oxide, which is much longer lasting.
The numbers on the back of sandpaper refer to the grit size, which indicates the coarseness or fineness of the abrasive particles on the paper. Lower numbers indicate coarser grits, suitable for heavy material removal, while higher numbers denote finer grits, ideal for smoother finishes.
Higher pixels on a display would mean finer display of images (like photos).
Wet sanding with 400 grit sandpaper then going to a finer sandpaper works well. Polish it with polishing compound or a buffering compound made for plastics.
The higher the number code printed on the back of all sandpaper the finer the grit. With a little practice you can begin to understand what grit is appropriate for any given job. For instance, I refinish hardwood floors and it requires three courses of sanding. To help quickly remove an old finish from hardwood floors I start with a very course #20 sandpaper. It is so rough that it removes a large amount of material pretty quickly. Then, when I have sanded the floor down to bare wood I "step up" to 60 grit sandpaper. Once I've gone over the entire floor with the 60 grit I "step up" again to the finer 100 grit paper. When refinishing wood floors or furniture it is necessary to use several courses of sanding to help remove the deep scratches created by the rougher grits of sandpaper. I hope this helps. John