Glossary

Annealing - a heat treating process that relieves stress and softens the material for improved fabricating. This is often useful in stamping, pleating, forming and other operations.

Calendering - passing wire cloth between heavy rollers to flatten the high points at the intersection of the wires, reducing the thickness of the wire cloth and giving the material a smooth surface.

Crimp - corrugations in the wires of woven wire cloth to lock the wires in place.

Laminate - two or more layers of wire cloth bonded together by sintering and usually calendered. Laminates combine the fine filtration characterisitics of a delicate weave with the strength of a coarser material.

Market Grade - wire cloth with a wire diameter that is normally woven and stocked for general purpose work.

Mesh - the number of openings per lineal inch of wire cloth, measure from the center of the wire.

Micron - 1/1000 millimeter, 0.00003937 inch; represented by the Greek letter "mu" (μ). It is the unit of measure for the particle retention of filter media.

Open Area - the ratio of the area of the open spaces between the wires to the total area of a piece of wire cloth, expressed as a percentage. The formula for determining the percentage of open area for square weave wire cloth is: Percentage of open area = (size of opening X mesh)2 X 100

Opening - the space between the adjacent parallel wires, usually expressed in decimal parts of an inch. The following formula is used to determine the width of opening a square weave wire cloth: Width of opening = (1/mesh) - wire diameter

Particle Retention - the ability of a filter medium to prevent the passage of solids. The size particle that will be retained by a given mesh is usually expressed in microns.

Pleating - a method of corrugating wire cloth, usually used to increase filter surface area.

Shute Wires - the wires running the width of a wire cloth roll, perpendicular to the warp wires. Sometimes referred to as "fill" or "weft".

Sintering - a heat treating process which bonds the woven wires to prevent fraying. By the nature of the process, sintering also anneals the wire cloth.

Warp Wires - the foundation wires, running the length of a wire cloth roll.

Wire Cloth - a general term for material woven from finely drawn wire rather than thread. Available in Square or Dutch weaves, Plain or Twilled.

Gauge - a number associated with industry standard sheet metal thicknesses.

Margins - unperforated areas along the edges of the sheet or coil; are usually specified for handling purposes

Staggered Pattern - holes in successive rows are staggered so that there is equal spacing between all holes.

Straight Pattern - holes are in straight rows in both directions.

Thickness - the thickness of a particular gauge of sheet metal is a function of the gauge and the type of the material, and is usually specified in decimal parts of an inch. Note that the thickness of different metals with the same gauge may be different.