When discussing air or fluid filtration we sometimes sense that some people have the impression that a 50 mesh screen and a 50 micron filter bag provide the same degree of filtration. In reality, a 50 mesh screen is five times more course than the 50 micron filter.
The mesh (sieve) system is based on the number of meshes per linear inch. Whereas, a micron rating filter is based on the maximum particle size that will pass through the filter media. Coating Manufacturers prefer the micron rating system. They use an absolute rated micron filter bag for their final filtration when they package their coatings. The naked eye should see a particle 40 micron in size. When consistency in filtration is important, micron rated filters are the way to go.
|
MESH SIZE compared to MICRON SIZE |
||||
|
Opening |
Opening |
Meshes Per |
U. S. Mesh |
|
|
In Microns |
In Inches |
Linear Inch |
(Sieve) Number |
Typical Application |
|
1000 |
0.0394 |
|
18 |
Pick-Up Screen, Airless Pump |
|
297 |
0.0117 |
52.36 |
50 |
Latex, Pigment Coatings |
|
250 |
0.0098 |
62.83 |
60 |
Industrial, Pigment Coatings |
|
210 |
0.0083 |
72.45 |
70 |
Industrial, Pigment Coatings |
|
190 |
0.0075 |
|
77 |
Auto. Solvent Basecoats & Clearcoats |
|
149 |
0.0059 |
101.01 |
100 |
Industrial, Clearcoats |
|
125 |
0.0049 |
|
120 |
Automotive Water-Base Basecoats |
|
105 |
0.0041 |
142.86 |
140 |
|
|
74 |
0.0029 |
200 |
200 |
|
|
53 |
0.0021 |
270.26 |
270 |
|
|
44 |
0.0017 |
323 |
325 |
|
|
10 |
0.00039 |
|
|
Hydraulic Oil, Downdraft Ceiling Media |
|
0.5 |
0.000019 |
|
|
Air Purification |
