Introduction
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Component Supply&#;s stock of filter mesh is a versatile material used in multiple industries and in a variety of applications. To assist researchers and product designers in choosing the best mesh for their applications, we want to define and explain the different properties of our mesh and how they impact each other.
There are seven major attributes of mesh: 1) mesh opening, 2) open area, 3) mesh count, 4) thread diameter, 5) weight, 6) thickness and 7) air permeability. At Component Supply, we don&#;t list weight, thickness or air permeability in our product information because, unlike the first four specifications, these three are not typically relevant in determining mesh use most applications. However, to give you a full picture of mesh properties, we will provide a simple definition for those terms as well.
Mesh Attributes
1) Mesh Opening refers to the actual size of the opening. In the charts on our site, this is measured in microns. Mesh opening is typically the most critical attribute because it determines the size of the particles it will capture and the size of the particles it allows to pass through. This attribute is specified in microns, which is a metric measurement equaling one thousandth of a millimeter.
2) Open area indicates the percentage of a specified area that is open. Open area can help determine what sort of flow restrictions might occur because of the filter. If we take a square piece of mesh screening that is exactly one inch by one inch and move all the lateral and horizontal fibers (warp and weft &#; we will cover this in another post or video) up and to one side we will be left with some part of the square that is solid (covered by the threads) and some part that is now open. With a mesh that has a 25% open area the square inch will be segmented into four parts, three (75%) will be covered by the threads and one (25%) will be open.
3) Mesh count is the number of threads in a linear inch and is fairly easy to determine. For example, if you were to lay out a piece of mesh and place a ruler on top, then count the horizontal threads from the beginning of the ruler to the one inch mark that would give you the mesh count. Of course, this is a simple task for mesh sizes like microns, which has 19 threads per inch. But it is daunting or even flat out impossible for some of the smaller mesh sizes. For mesh sizes down to about 200 microns you can count, or at least count one quarter of an inch and multiply. For sizes much smaller than that, it becomes difficult without some magnifications and a good bit of patience.
4) Thread diameter is the diameter of the thread measured in microns.
5) Weight is the weight of the material typically measured in ounces per square inch.
6) Thickness is the overall thickness of the mesh and measured in microns.
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7) Air permeability measures the rate of air flow passing perpendicularly through the mesh and, for our mesh, is measured liters (l)/square meter (sq. m.)/second (s).
The Relationship between Mesh Attributes
When selecting the appropriate mesh for an application it is important to know how these attributes are related to each other. Let&#;s use an example of mesh that has a 500 micron mesh opening, a 50% open area, a thread count of 20 and a thread diameter of 250 microns. If we were to change just one of these attributes, it would completely alter the product you&#;d be using. For example, if we decreased the thread diameter but left the mesh count constant, we would wind up with a larger mesh opening and open area. If we needed to capture smaller particles with a smaller mesh size, but wanted a similar open area for flow restriction reasons you could find a mesh that has the same thread diameter and a higher mesh count, or you could find a mesh that has an increased thread diameter and keep the thread count constant.
Conclusion
Understanding the attributes of mesh and how they relate, makes selecting it for a specific application less daunting. That being said there are not an infinite number of possibilities available. This mesh is woven on looms that produce as much as 10,000 meters at a time, so only very large filtration and screen printing applications get to &#;choose&#; what they really want in terms of mesh properties. While there may be other sizes, and we encourage you to ask about them, the specifications on our site represent most of what is available. Understanding the properties of mesh and how they are related and then purchasing based on that information is more effective and realistic than trying to customize your own mesh.
Choosing the correct water filter for your home&#;s water system is important to making sure you get the most out of your purchase. When it comes to a Rusco filter, there are a few things you&#;ll want to consider before implementing one into your system. Determining what size filter you&#;ll need based on the inlet and outlet, as well as factoring in the number of GPM running through your system is something that should be taken into consideration. You&#;ll also want to know whether or not the filter is needed for a hot water or cold water application. Depending on where the filter will be placed within your system, you may need to select one that doesn&#;t have a T-body and instead select an option with an L-body or a combo body. Figuring out what micron size you need for your filter screen is also something important to consider, and today we&#;ll focus on exactly what a micron is and how mesh size correlates.
Before discussing different micron sizes and how they correlate to mesh, let&#;s take a moment to understand exactly what a micron is. The word micron is actually short for micrometer, which means one millionth of a meter. It&#;s essentially a unit of measurement that describes the size of the particles that are allowed to pass through. As an example, a filter with a 150-micron rating will not allow anything that is larger than 150 microns to pass through it.
When it comes to microns, the larger the number, the more that will be able to pass through. For example, gravel is the size of microns. If you have a screen size in your filter that is equal to microns, anything smaller than the size of gravel would be able to pass through that screen. On the other hand, a dust mite is the size of 20 microns. A screen equal to 20 microns in a filter would only allow particles smaller than the size of a dust mite to pass through. As far as micron size is concerned, you want to remember that the larger the number the more that will pass through and the smaller the number the less.
You can see an example here of different particle types and their relative micron size.
Micron Continuum&#;
While it&#;s good to have an understanding of microns, if you purchase a water filter from Rusco you&#;ll discover that some of our filters utilize a different unit of measurement when it comes to screen size. In place of micron size, which is a standard unit of measurement throughout the industry, the mesh filters you purchase from Rusco are stamped with what is known as a mesh size. Mesh refers to the number of pores per square inch in a mesh material. A 24-mesh screen means that there are 24 pores in one square inch of mesh screen. A -mesh screen means that there are pores in one square inch of mesh screen.
When it comes to mesh, the larger the number, the less that will be able to pass through. For example, ragweed pollen is about the size of 370 mesh. If you were to have a screen size in your filter that is equal to 370 mesh, it would take something smaller than ragweed pollen to pass through that screen. On the other hand, a coffee ground is about the size of 50 mesh. A screen equal to 50 mesh would allow anything smaller than a coffee ground to pass through that screen. As far as mesh size is concerned, you want to remember that the smaller the number the more that will pass through and the larger the number the less.
At Rusco, we generally offer nine mesh sizes when it comes to polyester screens. To better understand how microns compare to mesh, below is a list of the conversions.
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Mesh Micron What It Filters 24 700 Shale, Sand, Shell, Debris 30 500 Pipe Scale, Coarse Sand 40 350 Pipe Scale, Coarse Sand 60 250 Fine Sand 100 150 Grit 140 100 Grit 250 50 Grit 500 30 Very Fine Sand, Grit 15 Ultra Fine, Fine grained, Powder, Dust-like sediment&#;
If you&#;d like to learn more about different mesh and micron sizes and which one is right for your application, give Rusco a call at 1-800-345-. A live customer service representative will be available to help answer your questions.
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