CHOOSING THE PROPER SANDPAPER
Choose the Right Grit Sandpaper is graded based on the number of abrasive particles per square inch that make up the sandpaper. The lower the number is, the coarser the grits become. Coarse sandpapers are grade 40-60 grits, medium sandpapers are 80-120 grits, fine sandpapers are graded 150-180 grits, the very fine ones are 220-240 grits, extra fine sandpapers are graded 280-320 grits, and finale the super fine ones are graded 360 grits above. Sanding using the finer grits removes the scratches that are left by the previous paper and eventually leaves a very smooth finish. Grading Sandpaper There two types of sandpaper; the commercial grade and the industrial grade. There is only a very few difference between the both; namely the material used as the grit, and the backing material or the paper and the glue that is used to hold the grit onto the paper. You may also see sandpaper that is either rated as “closed- coat” or “open-coat”. The difference is that the grit particles of the “closed-coat” sandpapers are grouped more closely together, while the grit particles of the “open-coat” newspapers have larger gaps between the particles. Generally, “open-coat” sandpapers are better for woodworking because it clogs less, specifically when working with softwoods that contain resin. Types of Abrasives There are five basic types of sandpaper that is available. However, not all of them are good for woodworking. Glass Paper- It is also known as flint paper. It is very lightweight and mostly pale yellow in color. It disintegrates easily and is rarely used for woodworking. Garnet Paper- It is usually brownish-red in color and commonly used in woodworking. It does not sand wood as quickly as the other sandpapers but it still leaves a better finish. This is the excellent choice for finish sanding. Aluminum Oxide- It is the paper that is most often used in power sanders. It is more durable than the garnet paper but doesn’t leave a very impressive finish at all. Silicone Carbide Paper- It is usually dark gray in color, and sometimes-even black. This is mostly used for finishing metals, or for wet-sanding, with the use of water as a lubricant. Though there are some advanced finishes that make us of Silicon Carbide Paper, this is not generally used for woodworking. Ceramic Sandpaper- This is made from the most durable abrasives available and it can remove and ample amount of material in a hurry. This is often used for belt sander belts, but can sometimes be used for hand shaping of wood. It leaves a very rough finish, so you must exercise proper care when you use the Ceramic Sandpaper, most importantly on veneers and plywood, where it can easily sand through the finish layer and ruin a pice. In general woodworking applications, you will likely find that beginning with carrying coarse-grit papers, particularly the Aluminum Oxide papers, then followed by the finer-grit Garnet papers, can produce an impressively smooth finish that can show off your woodworking skills and give you a very nice platform for staining or even painting your woodworking project. |
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