Sanding wood in preparation of finishing and removing light varnishįinal sanding of bare wood and sanding between coatsįor our stainless steel grit chart, click here. Removing old paint and rounding rough edges Oftentimes if you are trying to get a very smooth surface, it would make sense to “go through the grits.” This means you would start with a courser grit slowly working your way down to finer and finer grits to create even and smoother surface.įast removal of tough paint and varnish from surfaces and sanding old floors Lower number grit (coarser with larger particles) are generally used on tougher surfaces for heavy sanding, stripping, or cutting hard surfaces. Higher grit numbers (finer with smaller particles) are used for smoothing wood and painted surfaces between coats. Different grit sizes are also useful for varying surface types, i.e. Grit sizes vary so the users can accomplish specific tasks. There are also several other grading systems you may rarely see including the Japanese Industrial Standards Committee (JIS), micron grade, and the aught system. The numbers are fairly close for larger grit sizes but differ more with smaller grits. Europeans use FEPA - Federation of European Producers of Abrasives. ![]() The United States uses CAMI - Coated Abrasive Manufacturers Institute. There are two commonly used numbers you will see correlated with grit sizing. Grit sizes will range in appearance from being fine enough to resemble the size of cooking flour all the way up to larger grits that look like granulated sugar. That would be a coarser particle with a grit of 20. They are much bigger than the golf balls, so less will fit at once, let’s say 20. The balls are small so you’ll be able to fit a lot, let’s make believe 100, so we’ll give the golf balls a 100 grit. Imagine dropping a pile of golf balls through the hoop. A grit size of 100 would mean that much more particles would filter through with much smaller particles.Īnother way to visualize this is to picture a basketball hoop. So let’s say we have a sandpaper with a grit size of 30, then that means 30 particles would fit through the filter. The larger the particle, the less can fit through at once. The size of the grit is then determined by how many of each particle can fit through a 1 square inch filter. The filters on this machine will only allow specific sized particles of the materials to pass through each level. In order to get a uniform grit size across the surface of your sandpaper, the materials being used go through a sifting machine. Ceramic abrasives can last up to 6 times longer than other good quality sandpapers. Ceramic alumina- These abrasives are extremely hard and durable, making them an excellent choice for power sanding using ceramic belts or discs.This abrasive is commonly used on wood, fiberglass, and metal surfaces. Zirconia lasts longer than aluminum oxide, but not as long as ceramic. Zirconia alumina- This type of sandpaper is made from an aluminum oxide–zirconium oxide alloy that, like garnet and aluminum oxide, has particles that break down to keep a sharp surface.The materials in this sandpaper are capable of removing material faster than aluminum oxide but is not as long-lasting. Silicon carbide- A popular choice for wet sanding, as silicon carbide abrasives are often made with a waterproof backing.A major benefit of aluminum oxide coatings is that as it breaks down, the surface will expose new, sharp edges making this a longer-lasting abrasive. Aluminum oxide- Useful on most surfaces including wood, metal, plastic, and drywall.Emery - Also known as emery cloth due to its cloth backing, emery is a coarser abrasive best suited for sanding and polishing metal surfaces. ![]() Garnet sandpaper tends to wear quickly, which can be beneficial as it provides a finer finish as it wears down.
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