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  TECH TIP

“Mesh -vs- Micron Filtration…What is it All About?”

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

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