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Same Raw Material, Two Different Products
Expanded metal mesh starts its life the same way whether it ends up as standard or flattened product. A sheet of solid metal, usually steel or aluminum, goes into an expanding press. The press cuts and stretches the sheet simultaneously, creating a pattern of diamond shaped openings without producing any scrap. The metal is not punched and the strands are not welded together. The entire mesh is a single continuous piece of material. But what happens after the expanding press is what creates the two distinct types of expanded metal mesh, and they serve very different purposes.
Standard Expanded Metal Keeps Its Texture
Standard expanded metal, also called raised or regular expanded metal, comes off the expanding press and stays exactly as it is. The strands and bonds that form the diamond pattern are set at an angle to the original plane of the sheet. Run your hand over a sheet of standard expanded metal and you will feel a pronounced texture. The surface is not flat. The raised bonds create a three dimensional profile that provides excellent traction. This is why standard expanded metal shows up on walkways, stair treads, loading ramps, and anywhere that slip resistance matters. The raised surface grabs onto shoes and boots even when the metal is wet or oily.
Flattened Expanded Metal Gets Rolled Smooth
Flattened expanded metal goes through an additional manufacturing step. After the sheet comes out of the expanding press, it passes through a cold rolling mill. The rollers press down on the raised bonds and strands, flattening them back into a single plane. The result is a sheet that is smooth to the touch, thinner than the standard version, and slightly wider and longer than the original expanded sheet because the rolling process stretches it further. The diamond openings remain, but they are now flush with the surface. Flattened expanded metal mesh is the choice when a smooth, flat surface is the priority.
Where Each Type Belongs
The surface texture difference drives most of the application decisions. Standard expanded metal excels in industrial and utility settings where grip is essential. Catwalks, machine guards, trench covers, and security fencing all benefit from the raised, slip resistant surface. The three dimensional profile also adds stiffness, making standard expanded metal a good choice for self supporting panels that need to span gaps without additional framing. Flattened expanded metal, with its smooth surface, shows up in architectural applications like building facades, sun shades, ceiling panels, and decorative screens. It is easier to paint uniformly, looks cleaner in visible installations, and is safer to handle in areas where people might brush against the surface.
Filtration and Flow Considerations
Another key difference between the two types of expanded metal mesh involves how they handle liquids and airflow. The raised bonds on standard expanded metal create small dams that can trap liquids, which is actually useful in parts washing baskets and drying racks where you want to prevent pooling. Flattened expanded metal allows liquids and air to pass through more freely because nothing protrudes above the surface to redirect flow. For filtration applications, ventilation grilles, and acoustic panels, flattened expanded metal often provides more predictable and uniform flow characteristics. The choice between standard and flattened for these applications comes down to whether the raised profile helps or hinders the intended function.
Weight, Thickness, and Cost Factors
The cold rolling process that creates flattened expanded metal does more than just smooth the surface. It reduces the overall thickness of the sheet and increases its length and width. This means flattened expanded metal typically weighs slightly less per square foot than its standard counterpart made from the same base material. However, the additional rolling step adds to the manufacturing cost. Standard expanded metal is generally the more economical option. For projects where budget is the primary concern and the raised surface texture is acceptable, standard expanded metal mesh offers the best value. For applications where surface smoothness is non negotiable, the extra cost of flattening is a necessary investment.