Sanding wood is a process that, if done correctly, makes the wood surface very smooth by "machining" the surface of the wood with a multitude of very small sharp edges; in other words, sanding is the process of removing surface imperfections, including scratches, from a surface and thereby making the surface smooth.
The machining of wood, when sanding, is done by small pieces of abrasives with sharp edges. These sharp edges are fastened to a sheet of material called sandpaper. The degree of success when sanding wood depends to a large extent on the sandpaper used and to a lesser extent on the person or machine being used to do the sanding. Often smaller and smaller grits or particles are used in successive sanding operations to achieve an acceptably smooth surface.
Today, apple abrasives is here to tell you the basic knowledge of how to choose sandpaper from varieties we have.
Choosing the correct sandpaper is important and yet is easy. There are perhaps 500 different types of sandpaper when all the possibilities are considered, but you can boil that down into the five basic sandpaper options:
A. Commercial grade or industrial grade
B. Grit material (aluminum oxide, garnet, silicon carbide or ceramic)
C. Grit size (typically 40, 60, 80, 120, 240, 360, 400, 600, 800, 2000, for us, we supply until 5000 grit to provide you more choices, you are come to our showroom in UAE and have a test by yourself)
D. Backing material and bonding agent (paper, cotton, polyester backing; hide glue or heat-resistant resins)
E. Open-coat or closed-coat
Let's look at each option more closely.
A. Commercial or industrial
Commercial grade sandpaper is the grade of paper found in hardware stores and most home centers and lumberyards. This is usually a good grade and can perform well for home and hobby uses. Industrial grade paper is made from higher quality materials and can better withstand the rigors of industrial uses and demands.
B. Grit material
There are four primary abrasive minerals used in woodworking. They are aluminum oxide, garnet, silicon carbide, and ceramic.
Aluminum oxide is a granular material that has very sharp edges. If the mineral breaks when being used, new sharp edges are formed on the remaining material. This ability to leave sharp edges makes aluminum oxide sandpaper effective in removing wood quickly and yet the paper is long-lasting. It also means that pressure from the sanding tool is not negative, as far as the paper is concerned.
Garnet is a granular material, but it has more rounded edges, especially as it wears and the granular crystals break. Although this round edge produces smoother finishes, it also means that sanding is slower, and the paper will tend to wear out faster. Because it rubs and burnishes the wood more, it is an excellent choice for final sanding.