![]() Brown sandpaper, on the other hand, is usually made with silicon carbide and is better for finer sanding and achieving a smooth finish.ĥ. Black sandpaper is typically made with aluminum oxide and is more aggressive, suitable for heavy-duty sanding and removing larger imperfections. When sanding metal, it is important to consider the color of the sandpaper. In fact, using a lower grit sandpaper (around 120 to 180) can provide the necessary roughness for better paint adhesion or for removing a layer of old paint or rust.Ĥ. Contrary to popular belief, using a high grit sandpaper (around 320 to 400) does not necessarily result in a smoother or shinier metal surface. It is typically made of minerals such as aluminum oxide, silicon carbide, or garnet, which are extremely hard and sturdy materials.ģ. ![]() Although sandpaper is commonly associated with sand, the abrasive material used in sandpaper for metalwork is not sand at all. So, when you hear someone mention a “240-grit sandpaper,” it means there are 240 particles in every square inch of the sandpaper.Ģ. The sizing system for sandpaper grits, used for metal, is based on the number of abrasive particles per square inch. Particles must be larger than and 94% of the This ‘specification’, in the case of JIS R6001 the specification is that forĪny given grit, there is a maximum size, a range of sizes where 50% or more of theĪbrasive particle sizes must conform, and 'bookend' dimensions where greater than 94% of the Of particles above and below this size/range that is accepted as conforming to Is said to match a grit number, and there is a tolerance in size and percentage In most cases, a set size or range of sizes Specification is used to ensure that the abrasive in question 'generallyĬonforms' to a set of dimensions. ![]() Small, and it's not possible to measure each one individually, so a 'specification', not an absolute measure. The way in which 'grit' is defined is typically as a * micron, also expressed as μm or micrometre (micro-metre) is one-one millionth of a metre, 0.0000001m, 1.000 × 10 −6 m, 1/1000mm, 39.37 x 10 −6 inch, 0.000039" or in terms we might be able to comprehend, a piece of standard, good quality copy paper is 100 microns thick, human head hair is said to be between 17-150 microns in diameter. The common denominator in this table is the "stated 'grit' size", which does make labelling easy, but the problem is that grits aint grits! As you will see, for any given grit size, there is no commonality based on the only unchanging measure available to us, abrasive particle size in microns* ![]() I have tried to make it as easy to understand as possible, and to try and explain the difference in the abrasive particle sizes in most of the commonly found materials as pertains to 'sharpening'. While it is as all encompassing as is possible, there are limitations to what can be presented in such a table with respect to the amount of data, the way it can be presented and even avoiding "information overload". This list of 'grit sizes' is as complete as I can make it with the available information at the present moment in time and from the information provided by manufacturers and standards associations.Īt the time of this compilation, to the best of my knowledge, there is no other table of abrasives and their relative sizes as complete and broad ranging as the one presented above.
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