Overview

An etched stainless steel mesh is produced by photochemical machining, a subtractive process that dissolves unprotected metal through a photoresist mask rather than punching or weaving it. The artwork is transferred to a laminated dry-film resist by UV exposure, the apertures are developed open, and the sheet is sprayed with a temperature-controlled ferric chloride or acidic etchant until the holes break through. Because the metal is removed chemically, the strands stay flat and burr-free, with no work hardening, no recast layer and no woven-wire distortion. Stock is usually 304 or 316L stainless between 0.02 mm and 1.0 mm, though copper, nickel and nickel-iron alloys run on the same line for filtration, shielding and screening duties.

For a buyer, the value of etched stainless steel mesh lies in how precisely the aperture and the open-area ratio can be specified. Hole diameter, pitch, bar width and web margin are all defined in the film, so a 0.10 mm hole on a 0.15 mm pitch repeats identically from the first panel to the ten-thousandth. Designers trade open-area ratio against mechanical strength: raising the open area improves flow and acoustic transmission but narrows the ligament between holes and lowers burst resistance. Side-etch compensation is built into the artwork, because the etchant attacks laterally as it cuts downward, leaving a slightly tapered hole wall that must be predicted when the aperture is close to the material thickness.

Parameter Window

• Available Materials: 304/316L stainless, 301 spring stainless, C1100 copper, nickel 200, Ni-Fe Alloy 42, brass
• Material Thickness Range: 0.02–1.0 mm (0.05–0.3 mm typical for fine apertures)
• Tolerance: ±0.01 mm on hole diameter and pitch; ±0.02 mm on outer profile
• Minimum Feature: hole diameter ≥ 1.1 × thickness, with 0.05 mm achievable on 0.03 mm foil; minimum ligament 0.08 mm
• Surface Options: passivated, electropolished, black oxide, brushed, PVD coating, adhesive backing, frame bonding
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Compensation — Scale the aperture pattern to offset the predicted side-etch so finished holes land on target diameter.
2. Material Selection — Choose 316L for corrosive media, 304 for general screening, or copper and nickel where conductivity or shielding matters.
3. Cleaning & Lamination — Degrease the foil and hot-roll dry-film resist on both faces to seal out bubbles under fine ligaments.
4. Double-Sided Exposure — Register the aperture film to both sides of the sheet so top and bottom holes align within ±0.01 mm.
5. Development — Wash away unexposed resist to open the aperture array, then inspect for scumming or missing holes.
6. Etching — Spray matched etchant from both sides; control concentration, temperature and conveyor speed to hold the etch factor constant.
7. Stripping & Finishing — Remove resist, neutralize, then passivate, electropolish or blacken to stabilize the surface.
8. Inspection & Packaging — Measure aperture, open-area ratio and flatness by vision system, then pack flat on liners or in frames.

Core Advantages

1. Controlled open-area ratio: The film defines hole and bar geometry, so flow, light and acoustic transmission stay repeatable across a batch.
2. Burr-free flat strands: Chemical removal leaves no rolled edge or burr, so layers stack flush and seals seat evenly.
3. No tooling cost: A new hole pattern is a new film, making prototypes and frequent pitch changes economical.
4. Stress-free material: No stamping force or laser heat means the grain structure and corrosion resistance of 316L stay intact.
5. Fine apertures at thin gauge: Holes near 0.05 mm hold on 0.03 mm foil, beyond the practical limit of punching or weaving.
6. Double-sided precision: Balanced two-sided etching keeps hole walls symmetric and holds the foil flat after processing.

Typical Applications

• Filtration & screening: Fuel, hydraulic and polymer melt filters with uniform pores in 316L.
• EMI/RFI shielding: Vent panels and Faraday windows that combine airflow with attenuation.
• Acoustic meshes: Speaker and microphone grilles where open-area ratio sets transmission loss.
• Battery & fuel-cell screens: Current-collector and flow-field meshes in nickel or stainless.
• Printing & stencil masks: Fine apertures for solder paste, ink and coating deposition.
• Optical & sensor windows: Light baffles, encoder grids and protective screens with calibrated open area.

Design Notes & Process Considerations

1. Aperture versus thickness: Keep hole diameter at least 1.1 × material thickness, or the tapered wall and slow etchant exchange cause rounded, undersized holes.
2. Open-area ratio: State the target percentage explicitly; above roughly 60 % the ligaments get fragile and the panel needs a support frame.
3. Side-etch compensation: Provide the etch factor or let the shop tune artwork; a 0.01 mm lateral loss shifts a 0.10 mm hole by 20 %.
4. Ligament & margin: Leave unperforated borders of at least 2 mm and avoid isolated single holes at panel edges to prevent distortion.
5. Flatness callout: Specify flatness per 100 mm and request a stress-relief anneal if the mesh will be bonded or laminated.
6. Hole-wall taper: When the design stacks multiple layers, remember that etched stainless steel mesh has a slight through-thickness taper that affects alignment.