The mesh used for sieving is typically made of stainless steel woven wire, which is durable, less likely to contaminate materials, and maintains its specified openings effectively. Stainless steel mesh is available in a wide range of sizes from 125mm to 20µm (5.0in to No.635), meeting ASTM/ISO standards.
Stainless Steel Mesh: Stainless steel mesh is the most commonly used type of mesh for sieves due to its durability and resistance to deformation. It is less likely to contaminate sensitive materials during processing, which is crucial in laboratory testing and small-scale production applications. The mesh is available in various sizes, ensuring that it can be used for a wide range of materials and particle sizes. The material's ability to maintain its specified openings over time makes it a reliable choice for accurate sieving.
Brass Wire Mesh: While stainless steel is more prevalent, brass wire mesh is also used, particularly in applications where spark resistance is necessary, such as with hazardous materials. Brass mesh is available in sizes ranging from 2.36mm to 45µm (No. 8 to No. 325). However, due to its malleability and the lower cost of stainless steel, brass is used less frequently today.
Non-Metallic Mesh: For unique applications where metal mesh is not permissible or may become contaminated, non-metallic mesh woven from polyester or nylon filament is available. This synthetic mesh offers equivalent opening sizes to many ASTM/ISO sizes but does not meet the same material type or wire diameter requirements as metallic meshes.
Perforated Plate: In some specialized applications, such as the sieve analysis of coal, ores, coke, wood chips, and other special materials, perforated plates are used. These are precision-punched steel plates with openings ranging from 3.18 to 100mm (1/8 to 4.0in), meeting the requirements of ASTM E323.
In summary, the choice of mesh for sieving depends on the specific requirements of the application, with stainless steel being the most common due to its durability and effectiveness. Brass and non-metallic meshes are used in specific scenarios, and perforated plates are employed for specialized materials.
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