...................................................................................................................................................................
Industrial
Specialties Mfg. (ISM)
What is a micron?
Micron is the measure of length most
frequently used to describe tiny particle sizes.
The term micron is actually a commonly used
shorthand for micrometer (American spelling) or micrometre (international
spelling).
The official symbol for the micron or micrometer
is μm, sometimes simplified as um.
A micron is defined as one-millionth of a
meter, a little more than one twenty-five thousandth of an inch.
What does mesh size mean?
Mesh size is referring to the mesh number (a
US measurement standard) and its relationship to the size of the openings in
the mesh and thus the size of particles that can pass through these openings.
Figuring out the mesh number is simple. All
you do is count the number of openings in one linear inch of screen.
This count is the mesh number. A 4-mesh screen
means there are four little square openings across one inch of screen. A
100-mesh screen has 100 openings per inch, and so on.
As the number indicating the mesh size
increases, the size of the openings and thus the size of particles captured by
the screen decreases.
Higher mesh numbers = smaller particle sizes.
It is very important to remember that mesh
size is not a precise measurement of the mesh opening size.
This is because screens can be made with
different materials with different thicknesses of strands or wire. The thicker
the strands, the smaller the openings that a particle can pass through, and
vice versa.
Also keep in mind that mesh is a
two-dimensional sheet and the actual 3D shapes of particles vary dramatically.
A good example of this is the diameter of a
hair versus its length.
Particles can also be elastic amalgams or
clumps of mixed materials that can deform and squeeze through mesh openings.
How fine do screens get?
This depends on the thickness of the wire or
strand used to make the mesh.
Most ISM flow control components do not
contain filter screens any finer than 500 mesh.
The primary reason for this is that as the
mesh number rises, the space between the wires or strands becomes smaller.
At some point the mesh number becomes so high
that the percentage of open area is too low to be useful.
This point is usually somewhere between 450
and 700 mesh depending on the diameter of the wire or filament used.
Note: Beyond 325 to 400 mesh, particle size is
normally described only in microns.
US
Mesh*
|
Microns
|
Inches
|
Millimeters
|
35
|
500
|
0.0197
|
0.5
|
40
|
400
|
0.0165
|
0.4
|
45
|
354
|
0.0138
|
0.354
|
50
|
297
|
0.0117
|
0.297
|
60
|
250
|
0.0098
|
0.25
|
70
|
210
|
0.0083
|
0.21
|
80
|
177
|
0.007
|
0.177
|
100
|
149
|
0.0059
|
0.149
|
120
|
125
|
0.0049
|
0.125
|
140
|
105
|
0.0041
|
0.105
|
170
|
88
|
0.0035
|
0.088
|
200
|
74
|
0.0029
|
0.074
|
230
|
63
|
0.0025
|
0.063
|
270
|
53
|
0.0021
|
0.053
|
325
|
44
|
0.0017
|
0.044
|
400
|
37
|
0.0015
|
0.037
|
450
|
32
|
0.0013
|
0.032
|
500
|
25
|
0.001
|
0.025
|
635
|
20
|
0.0008
|
0.002
|
*Values are based on the American National
Standard for Industrial Wire Cloth (American Standard ASTM - E 11).
Note: ISM offers fluid, gas and air flow management components
some of which contain filter mesh as a component part. ISM does offer mesh
itself and is unable to source or provide it.
ISM Mission Statement:
"It is the mission of ISM to provide customers with quality component products and assemblies on time and at a competitive price. A core value of ISM is to over service our customers and not only meet but exceed their expectations. We will always be appreciative of our employees and acknowledge their efforts. In addition, we will remain focused on treating all customers, suppliers and colleagues respectfully, and will strive to be courteous and helpful in all business matters. Our integrity will never be compromised for profit. It is important to give back to our community and we will remain a positive influence to the best of our abilities in all that we do."
"It is the mission of ISM to provide customers with quality component products and assemblies on time and at a competitive price. A core value of ISM is to over service our customers and not only meet but exceed their expectations. We will always be appreciative of our employees and acknowledge their efforts. In addition, we will remain focused on treating all customers, suppliers and colleagues respectfully, and will strive to be courteous and helpful in all business matters. Our integrity will never be compromised for profit. It is important to give back to our community and we will remain a positive influence to the best of our abilities in all that we do."
No comments:
Post a Comment