![]() ![]() Specification is used to ensure that the abrasive in question 'generallyĬonforms' to a set of dimensions. Different sources will quote slightly different numbers, so dont be surprised if some of the numbers seem off. 8K American and 5K JIS are both 3 micron stones. Others will say they can comfortably shave off 5K, those are on JIS. Small, and it's not possible to measure each one individually, so a When people say that 8K is the minimum they are able to shave off of, that is American Standard. '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'. There is a similar sequence for macrogrits. It is advantageous to use MICRO-MESH as soon as possible in your finishing process as it gives a more consistent scratch pattern and therefore a better. ![]() There are many ways to measure the individual particles that are embedded in abrasives. Use conventional abrasives as normal prior to going into the MICRO-MESH stage. Grit to Micron Comparison Chart Use this handy chart as a reference to compare approximate grit measurements because measurement and particle size vary widely among manufacturers, this chart should be used as a guide only. Sandpaper Grit Chart Average Micron Size (in inches) CAMI GRIT RANGE FEPA P GRADE AKA COMMON USES 0.02886 - 0. 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". It is only necessary to remember the micron sequence 1 2 3 5 7 10 14 20 28 40 60 for microgrits. Use this CONVERSION CHART as a guide to know when you can start using MICRO- MESH. 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. SANDPAPER GRIT COMPARISON P-SCALE FEPA US STD CAMI MICRON MICRO MESH AbrasivePads 50 351 P50 326 60 268 P60 260 P80 197 80 192 P100 156 100 141 P120 127 120 116 P150 97 150 93 LT Gray/Green P180 180 78 LT Gray/Green 220 66 P220 65 Maroon P240 58.56 Maroon P280 240 52.5 Maroon P320 46. ![]()
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