thanks Chamba for sending me this chart. i also think this info needs to be a sticky. this way it's easy to find. anyone that wants to add info about which size screens they use for which kind of jobs or any other related info, please do so.
Mesh to Micron Conversion Chart
had to add this quote from Chamba...
Mesh to Micron Conversion Chart
had to add this quote from Chamba...
A 124LPI would be a 70 US Mesh or a 210u. Not suitable for the vacuum
That's incorrect, 124 lines per inch (LPI) = 124 Mesh, 100 Mesh = 100 lines per inch mesh. US Mesh are based on how many lines per inch.
70 mesh has 70 LPI
Some USA "100 Mesh" (or 100 lines or threads per linear inch mesh) screens are similar to 160 micron (microns measure the distance between the mesh openings and so are more accurate for our application), some have 150 microns openings....and it also depends on how thick the threads are when basing comparisons by using US Mesh sizing.
Check out the mesh comparison chart that is "sticky-ed" on the top of this "Hashish" forum...but that's just one chart, other charts that you will notice online will and can be slightly different (as they are based on meshes with different thread thicknesses,...a mesh with really thick threads will have smaller openings than a mesh of the same lines per inch count that has thin threads, so one 100 Mesh might have openings of 160 microns and another will have openings that are 140 microns)...but since almost all meshes commonly available today are synthetic (mostly Nylon) and are mono-filament threads (not silk, which is like rope and each thread is a combination of many finer threads twirled together to form one thread), and the threads are not that different, so you can use the attached chart to get a fairly accurate comparison
another way to check out the Mesh size (or how many lines per inch the screen is) is to get yourself a thread counter, which is a magnifying glass that is mounted on a fold out metal frame, there are 3 sides which are hinged together, these are about 2 inches x 2 inches and have fractional inch and also often metric markings on them. Fold out the device so it locks in place to form a cube, hold the glass section close to your eye and press the opposite side hard against the mesh as you hold it up to light (a window or low watt lamp) and count how threads there are in a quarter inch section, then multiply that number x 4 to get the lines per inch count. It's easy to count 80, 100 and even 125 Mesh screens with this, but finer meshes, eg 200 Mesh, are difficult to count with a thread counter, so it's easier to count a smaller section then multiply (that's if you have really good eye sight)...for fine meshes, use a microscope (USB if you have it) with a ruler on the mesh.
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