🔎 UNIDENTIFIED 2 pieces of 150 mesh screen, one is true the other is.......

[zemetrius]

i bought some 150 mesh screen on amazon, the small piece is from the first purchase i made. i needed to make a bigger screen so i bought a bigger piece of 150 mesh screen from amazon and from a different seller. one of these is 150 mesh, one of these is something else.

 

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[AU Seeker]

The one on the right/small piece is closer to 150 mesh.

Mesh how many openings there are in 1 square inch, you can count the openings in person better than we can from a photo.

 

[zemetrius]

thanks to my microscope i was able to zoom in enough to seen this, i put a piece of graph paper under to define a 1 inch square. final count 30 x 30 in 1 inch grid. that would make it 300 mesh then right?

 

[ncsuwolf]

Unless I’m mistaken 30x30=900

 

[zemetrius]

my calculator agrees with you. so this is smaller than 300 mesh?

 

[Red-Coat]

Mesh sizes are conventionally defined by the number of openings per linear inch, not per square inch - according to the American National Standard for Industrial Wire Cloth (American Standard ASTM - E 11).

So 150 Mesh should have 150x150 (22,500) openings per square inch and (allowing for wire strands of typical thickness), the apertures themselves would be below 0.004 inches (0.1mm) across.

Note that 'Mesh Size/Number' alone does not define the actual aperture size unless the wire strand thickness is also specified.

 

[ncsuwolf]

Mesh sizes are conventionally defined by the number of openings per linear inch, not per square inch - according to the American National Standard for Industrial Wire Cloth (American Standard ASTM - E 11).

So 150 Mesh should have 150x150 (22,500) openings per square inch and (allowing for wire strands of typical thickness), the apertures themselves would be below 0.004 inches (0.1mm) across.

Note that 'Mesh Size/Number' alone does not define the actual aperture size unless the wire strand thickness is also specified.

Agreed. There are differing opinions on how to measure (I’m sure one is accurate, the others not). Where I work, when we talk of a 4,5,6 or 32 screen we are speaking of # of holes per inch (kind of) as measured center to center of the wires (bringing in your wire thickness consideration). Not to confuse things, but we also have “true quarter” measurements which means the opening is .25x.25 regardless of wire specs. When you get to levels like 150, you’re pretty much at cloth, not screen (my opinion).

Maybe a better question that should have been asked earlier….what is the goal/intended usage for this screen?

 

[ConceptualizedNetherlandr]

When selecting a screen one is typically seeking a particular Sieve Opening size the will allow passing anything smaller and retain anything larger.

So the number of holes is irrelevant. As mentioned above variable wire diameter confounds any standard relationship between Sieve Opening and ' Screen Scale Equivalent Designation'

see https://www.wovenwire.com/reference/astm-sieve.htm

But here is the way to compare them. Run a small sample through one of them. Then try to run separately both what passed and what was retained with the other screen. You can even do it again with the order reversed. If they are the same Sieve Opening all the material that passes screen A will pass B and all that was retained on
A will also be retained on B. If not you know which one is larger.