Stainless Steel Woven Wire Mesh Selection Guide

To specify stainless steel woven wire mesh, confirm the working medium, material grade, weave, wire diameter and required opening or filtration performance together. Mesh count alone is not enough. Two rolls with the same mesh count can have different openings, flow characteristics and handling strength.

This guide explains how to compare specifications for mesh rolls and fabricated filter parts, which inspection questions to ask, and what information to include in a quotation request.

Start with the application

For screening, define the particle sizes you need to separate. For liquid or gas filtration, describe the particles to be retained and the required flow. Include the medium, operating temperature, cleaning chemicals and installation arrangement.

Distinguish system pressure from differential pressure across the mesh. A filter can experience a rising differential pressure as particles accumulate, even when the system pressure remains steady. The mesh, supporting structure, seams and seals must be evaluated as an assembly. A material grade or weave name alone does not establish an allowable pressure.

Choose the material for the environment

304 is a common starting point for general screening and filtration where the medium is compatible. Molybdenum-bearing 316 and 316L generally provide better resistance to chloride-related pitting than 304, but they are not immune to corrosion. Temperature, concentration, deposits and crevices affect the choice.

The lower carbon limit of 316L helps reduce sensitization risk during welding or certain thermal exposures. It does not make 316L a universal solution for aggressive chemicals. Check both the process fluid and the cleaning regime. A grade designation alone also does not demonstrate that a finished component meets a food-contact or pharmaceutical requirement.

For more demanding duties, alloys such as 904L or duplex 2205 may warrant evaluation. They are not interchangeable upgrades. Compatibility, wire availability, weaving and fabrication must be assessed for the specified mesh. PREN can help compare alloy resistance to pitting, but it is not a service-life prediction or a substitute for application-specific corrosion assessment. See Outokumpu’s corrosion guidance.

Match the weave to the separation task

Plain square weave normally follows an over-one, under-one pattern. Common twill square weave follows an over-two, under-two pattern and can accommodate wire and mesh-count combinations that differ from plain weave. Select between them using the required aperture, wire diameter, support and fabrication needs.

Dutch weave filter cloth uses unequal wire counts and different wire diameters in the two directions. Its filtration paths are not simple square openings. For plain Dutch, twill Dutch or reverse Dutch cloth, request the actual specification and rating method rather than translating a mesh designation with a square-mesh formula.

For product enquiries, browse Kangyao’s stainless steel woven wire mesh and Dutch weave wire mesh pages. Confirm the required construction and availability for your order.

Understand mesh count and aperture together

For regular square-opening mesh with the same nominal pitch and wire diameter in both directions:

Aperture a (mm) = 25.4 / mesh count − wire diameter d (mm)

The pitch is the opening plus the wire diameter. Thus, increasing wire diameter at a fixed mesh count reduces the theoretical opening. These geometric relationships are explained in Haver & Boecker’s wire cloth terminology.

A calculated 200 mesh example

The pitch in both examples is 25.4 / 200 = 0.127 mm. Subtracting the wire diameter gives the aperture. These are ideal geometric calculations, not Kangyao test results, stock specifications or supply commitments. Actual dimensions require measurement and agreed tolerances.

Example B has a larger opening and more open area. It is not automatically a better filter: a different opening changes particle passage, and thinner wire changes the mechanical design. Do not apply this calculation to Dutch weave, rectangular openings or sintered multilayer media.

What open area tells you

For the same regular square-opening geometry:

Open area (%) = [a / (a + d)]² × 100

Use the same units for a and d. Higher open area can help flow under otherwise comparable conditions, but this percentage does not predict throughput or pressure drop by itself. Fluid viscosity, mesh thickness, weave, support, contamination loading and filter area also matter. Test the proposed medium under representative conditions when flow or pressure loss is critical.

Separate aperture from filtration rating

Aperture describes geometry. A filtration rating describes performance or a pore-size criterion under a stated method. A calculated 77 μm opening is not, by itself, a validated 77 μm absolute filter rating.

Before comparing two micron-rated products, ask what “nominal” or “absolute” means in each quotation. Request the test method, particle size, retention criterion and operating conditions. Particle shape, bypass at edges and changes under loading can affect the result.

For fine woven filter cloth, bubble-point and particle-based methods provide different information. A bubble-point test uses a wetted specimen and increasing gas pressure to evaluate the largest effective through-pore under the specified method. The wetting liquid, temperature, cleanliness and fixture sealing affect the result. It does not independently demonstrate a complete particle-removal efficiency curve. Haver & Boecker compares bubble-point and glass-bead testing here.

Agree on inspection before comparing prices

Compare quotations against the same material, weave, wire diameter, aperture or rating, dimensions and acceptance criteria. Define how dimensional variation, local weaving defects, damaged edges and cleanliness will be assessed.

Relevant standards have different scopes:

• ISO 9044:2016 addresses industrial square-aperture woven wire cloth for screening. It excludes pre-crimped and welded screens and cloth coated after weaving; its use outside screening is limited.
• ASTM E2814-22 addresses industrial woven wire filter cloth, including Dutch weave, and alternative acceptance criteria for pore size or filtration rating.

Name the agreed edition, inspection method and acceptance limits in the order. Referring to a standard does not prove that a supplier or a particular batch complies with it.

For material verification, ask for traceable documentation and an appropriate test method. Handheld XRF can identify elements such as chromium, nickel and molybdenum, but it cannot measure the carbon needed to distinguish 316 from 316L. Carbon-capable OES, suitably configured LIBS or laboratory analysis may be needed. Sample suitability and preparation also matter, particularly for fine wire. See Thermo Fisher’s comparison of PMI methods.

Specify the finished filter part

Cutting, forming and welding can affect dimensions, edges and local mesh geometry. A drawing for a filter disc or cylinder should identify the finished dimensions, tolerances, edge condition, seam position, support and sealing arrangement. Include cleanliness and packaging requirements where they affect assembly or service.

Ultrasonic cleaning and electropolishing have different purposes. Neither should be treated as proof of a defined cleanliness level without an agreed process and acceptance criterion. Surface treatment does not correct the wrong alloy or an unsuitable aperture.

Sintered wire mesh uses a controlled thermal process to bond selected woven layers. Layer arrangement and manufacturing conditions vary; not every construction has five layers or requires the same applied pressure. Porvair describes multilayer diffusion-bonded mesh. Such constructions can improve rigidity and pore stability, but pressure and backwash limits must be established for the particular element, supports, joints and temperature.

For a fabricated-part enquiry, refer to Kangyao’s custom wire mesh fabrication page and submit the drawing. Specify the required outcome rather than assuming that a listed process guarantees it.

Send a specification that can be quoted

Include these details with your request:

• Material grade and required material documentation.
• Weave, mesh count and wire diameter, or the required aperture or filtration rating with its test method.
• Roll width and length, or finished-part drawing, dimensions and tolerances.
• Quantity, edge treatment, support, seams and sealing requirements.
• Medium, temperature, required flow, differential pressure and cleaning method.
• Inspection and acceptance requirements, packaging, destination and requested delivery date.

If some values are unknown, describe the application and the existing part, and identify which details still need to be determined. A photograph is useful context but cannot establish alloy chemistry or a verified filtration rating.

Send your specification or drawing to Kangyao to discuss the enquiry. Confirm material, construction, acceptance criteria, availability and delivery terms in the quotation before ordering.