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Absolute Filter Rating

A measure of retention, expressed in microns, that specifies the equivalent diameter of the smallest particle from which the filter has retention of 100%. In actual practice, most manufacturers assign absolute ratings on the basis of retention in the range from 98% - 99.999999%.


Alloy

A wire mesh with metal properties.


Bolting Cloth

Bolting Cloth – A thin, strong, flexible precisely woven group of meshes which are used for sieving and sifting powders. 


Calendered Wire Cloth

Wire mesh that is passed through rollers to reduce the overall thickness    of the material.


Coarse Stainless Steel Mesh

Coarse Stainless Steel Mesh - Openings that range from about the size of a pencil lead (1/16 inch) and downward to the size of a medium human hair (1/125 inch).


Crimp

Corrugations in wires to lock them in place when perpendicular to each other.


Filter Cloth

Wire Mesh used for filtering and straining.


Fine Stainless Steel Mesh

Fine Stainless Steel Mesh - Group of stainless steel wire cloth mesh has openings that range from about the size of a medium human hair (200 microns) and downward  to the size of a large bacteria (2 microns).


Galvanized After Welded

Wire mesh that is drawn through a bath of molten zinc after it is welded.This mesh emerges with a thick coating tightly bonded to the wire. Each wire is thoroughly sealed guaranteeing a longer lifetime than galvanized before meshes


Galvanized Before Welded

Wire mesh that is made from strands of wire that are coated with zinc and then welded together. During the welding process the protective layer of zinc is burnt offleaving the wire unprotected at the welded joint where the wires cross.


Gauge

The size of wire.


Hardware Cloth

Usually galvanized, a sturdy screen made from wire welded or woven to produce a mesh size of 1/8 to 3/4.


Insect Screen

Insect Screen – A screen designed to cover the opening of a window, usually 18x14 mesh or similar. 


Linear Foot

A linear foot is a unit of measurement of length. A piece of material measuring, for example, 3 feet wide by 15 feet long would be 15 linear feet. The same piece of material could be described as 45 square feet; 3 feet wide X 15 linear feet which equals 45 square feet. Note: sometimes the term "running foot is used to mean linear foot".


Market Grade Mesh

Sturdy mesh is woven from a standard wire diameter which is heavier than the wire used to weave bolting cloth.


Mesh

The number of openings in a linear inch, measured from the center of one wire to a point one inch distant. Also known as “Mesh Count”.


Mesh Opening

The hole size which is the distance between two adjacent parallel wires.


Micron

A unit length in the metric system. One micron is equivalent to .00003937 of one inch.


Micronic Screen

Mesh with nominal micron rating as low as 5 and gives exceptional flow characteristics.


Mill Finish

The finish a material has as it exits the mill where it's processed.


Nominal Filter Rating

A measure of retention, expressed in microns, that specifies the equivalent diameter of the smallest particle for which the filter has a retention somewhere in the range of 60-90%. Nominal filter rating is imprecise.


Off Count Mesh

A mesh which has a greater number of wires per inch in one direction, usually the warp direction.


Plain Dutch Weave (PDW)

Plain Dutch Weave (PDW) – A plain weave with the warp wire of a larger diameter than of the shute wire. The weave is made up of a limited number of warp wires interwoven with the maximum number of shute wires which can be positioned. The cloth is strong and firm and is most frequently used for high pressure filtration.


Plain Weave (PSW)

The most commonly used weave. Each shute wire passes alternatively over and under each warp wire and vice versa. Warp and shute wire diameters are generally the same.


Selvage

A finished edge to prevent unraveling on the edge of the roll.


Shute Wire Diameter

The wires running across the width of the cloth as woven (short wires).


Soffit Screen

Soffit Screen – Galvanized Hardware Cloth used for vent screening.


Spark Arrester

Spark Arrester - Steel mesh that stops sparks and allows light and heat to pass through.


Square foot

A square foot is a unit of measurement of area. A piece of material measuring 12 inches by 12 inches is one square foot. To compute the number of square feet in a piece of wire mesh you multiply its width in feet times its length in feet. For example, a piece           of wire mesh 4 feet wide and 3 feet long would be 12 square feet.


Twill Weave (TW)

Stronger than plain weave. Each shute wire alternatively crosses over two, then under two warp wires, producing a diagonal pattern. The wire            diameter for both warp and shute is normally the same. Twill weave can       be used to accommodate a heavier than standard wire diameter in association with a given mesh. Specifications finer than 300 are normallytwill weave.


Twilled Dutch Weave (TDW)

Twilled Dutch Weave (TDW) – Similar to plain dutch weave, except that the weave pattern is twill, i.e. a double layer of shute wires. There are no openings in the true sense of the word, and the filtrate follows a tortuous path through the triangular passages in the mesh. Twilled Dutch Weave  is a surface filtration medium, often used under high pressure.


Warp Wire Diameter

The wires running the long way of the material as woven (long wires).


Wire Diameter

The diameter of wire in the mesh.


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