Overview

Metal mesh chemical etching is a photochemical machining route to perforated metal sheet in which the hole pattern is transferred by photoresist and developed, then the exposed metal is dissolved in an etchant selected for that alloy. The result is a flat mesh with straight-walled apertures, no burrs and no rolled edges, produced from artwork rather than from a die. The practical advantage over weaving or stamping is breadth: stainless steel, copper, brass, nickel and aluminum all run through the same artwork-to-etch sequence, each with its own chemistry, resist and rinse regime.

Alloy choice drives the whole job. Ferric chloride suits 304/316L stainless and copper; cupric chloride gives copper and brass a cleaner, more controllable cut; nickel needs its own bath and tighter agitation; aluminum etches in alkaline chemistry and demands careful handling to avoid surface staining. Because each material has a different etch rate, hole size and strand width are compensated per alloy at the artwork stage, so a mixed-material order still delivers the same nominal aperture. That material range is what buyers usually mean when they ask for metal mesh chemical etching rather than a single-alloy mesh supply.

Parameter Window

• Available Materials: 304/316L stainless steel, copper (C1100), brass, nickel, aluminum (1050/5052)
• Material Thickness Range: 0.03–1.0 mm
• Tolerance: ±0.05 mm on outline, ±0.02 mm on hole centre pitch
• Minimum Feature: 0.1 mm hole diameter with 0.08 mm strand at 0.1 mm stock
• Surface Options: passivation, nickel or tin plating, anodizing on aluminum, brushed finish, stress-relief annealing
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Pattern Engineering — Review hole layout, strand width and border, then apply the etch compensation factor for the chosen alloy.
2. Alloy Routing — Assign chemistry, resist type and racking method per material so mixed orders are batched without cross-contamination.
3. Degrease & Laminate — Clean the sheet and apply dry film resist, keeping the roll temperature stable so adhesion is even across the panel.
4. Exposure — Image the pattern through film registered to tooling holes, holding hole-to-hole pitch across the full sheet.
5. Develop — Remove unexposed resist and verify hole openings and strand width under magnification before etching.
6. Etch — Run the matched bath with controlled specific gravity, temperature and dwell; copper and stainless are etched on separate lines.
7. Strip & Finish — Remove resist, neutralise, then passivate, plate, anodize or anneal according to the drawing.
8. Metrology & Pack — Check hole size, pitch, flatness and surface condition, then pack flat with interleaving to protect thin webs.

Core Advantages

1. One process, five alloys: Stainless, copper, brass, nickel and aluminum share the same front-end workflow, so a multi-material bill of materials does not need multiple suppliers.
2. Hole size independent of weave: Aperture and strand are drawn, so a 40% open area can be held at almost any hole count rather than snapping to a standard mesh number.
3. No burr, no delamination: Chemical cutting never rolls the edge or separates a plated layer, which matters on thin nickel and plated copper.
4. Flat panels for downstream bonding: Mesh leaves the bath flat, so it laminates, welds and gaskets without the oil-canning of woven cloth.
5. Tooling-free revisions: Changing hole pattern, border width or panel outline costs a new film, not a new die.
6. Material-matched finishing: The same part can be passivated, plated or anodized, letting one drawing cover corrosion, solderability and appearance needs.

Typical Applications

• EMI and RF shielding: Copper and nickel mesh panels with tuned open area for enclosures and display windows.
• Speaker and acoustic mesh: Fine stainless or aluminum mesh with uniform holes for grilles and microphone covers.
• Battery and fuel-cell parts: Nickel and copper mesh for current collection and gas diffusion support.
• Industrial sieving: Coarse-aperture stainless mesh for screening and classification where woven cloth distorts.
• Decorative and architectural panels: Brass and aluminum mesh with a consistent pattern for facades and interiors.
• Ventilation and protective screens: Aluminum mesh guards that stay flat over large openings without sagging.

Design Notes & Process Considerations

1. Confirm the alloy before quoting: Etch rate, minimum hole and available finish all change with material; a drawing that suits 304 may not suit aluminum.
2. Allow for etch compensation: Holes etch slightly larger than the film opening, so artwork is undersized by a factor agreed at first article.
3. Keep hole-to-strand ratio sane: A hole more than three times the strand width leaves a web that is fragile in handling and in service.
4. Watch dissimilar-metal contact: Copper mesh against aluminum housings invites galvanic corrosion; specify plating or an isolating gasket.
5. State flatness where it matters: Large thin panels can bow after stripping; ask for stress-relief annealing when the mesh must sit flush.
6. Plan the border: A solid rim of 1.5 mm or more carries handling, welding and fastening loads and keeps the web from tearing.