Overview

An etched nickel filter mesh is a precision screen made by photochemical machining, where a photoresist defines a dense array of holes and a controlled etchant dissolves the metal through the openings. Pure nickel Ni200/Ni201 is favored for its corrosion resistance, ductility and stable pore geometry, while 316L stainless and Monel serve harsher chemical or temperature environments. Because the holes are formed chemically from both faces, the mesh leaves the line flat, burr-free and free of the torn edges and work-hardened rims that woven wire or punched sheet produce. Hole diameter, pitch and open area are set by the artwork, so round, square, slotted or tapered pores can be mixed on one panel without tooling changes. Stock typically runs from 0.05 mm to 0.5 mm.

For filtration, fuel-cell and analytical equipment buyers, an etched nickel filter mesh offers control that woven mesh cannot: the pore size is a designed value rather than a weave average, the ligament between holes is uniform, and the surface stays smooth enough for back-flushing and clean-in-place cycles. Apertures down to 0.1 mm hold ±0.01 mm, and a full sheet of identical holes keeps flow rate and pressure drop predictable from the first sample to volume production. The same process also supports multi-layer diffusion-bonded stacks and half-etched surface channels, giving engineers a route to graded filtration in a single compact component.

Parameter Window

• Available Materials: pure nickel Ni200/Ni201, nickel alloys, Monel, 316L stainless, copper on request
• Material Thickness Range: 0.05–0.5 mm
• Tolerance: ±0.01 mm on hole diameter, ±0.02 mm on hole position, open area held per drawing
• Minimum Feature: 0.1 mm hole diameter, 0.12 mm ligament, tapered or straight walls
• Surface Options: electropolished, passivated, burr-free, multi-layer diffusion bonding, half-etched flow channels
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Pattern Review — Confirm hole shape, diameter, pitch, open area and ligament width against flow requirements.
2. Material Selection — Choose Ni200/Ni201 for general corrosion resistance, Monel or 316L for aggressive media.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces for symmetric, straight-wall holes.
4. Dual-Side Exposure — Expose the aperture array front and back in registered alignment across a high-resolution film.
5. Development — Open the hole areas and inspect for resist bridging in the narrow ligaments.
6. Etching — Spray etchant from both sides, balancing time and pressure to hit diameter and wall taper without undercut.
7. Stripping & Finishing — Strip resist, electropolish or passivate, and bond multiple layers where a graded stack is specified.
8. Inspection & Packaging — Measure hole diameter, open area and flatness by vision system, then pack flat with lot records.

Core Advantages

1. Designed pore size: Hole diameter is set by artwork, not a weave average, so filtration cut points are repeatable.
2. Burr-free smooth surface: Chemical holes have no torn rims, which eases back-flushing and reduces particle shedding.
3. Uniform ligaments: Even metal between holes gives predictable strength and consistent pressure drop across the sheet.
4. Flat and stress-free: No punching distortion, so screens seal evenly in housings and stack without gaps.
5. Mixed patterns in one panel: Round, slotted and tapered pores can be combined without a separate tool for each.
6. Material and stack flexibility: An etched nickel filter mesh can run in pure nickel, Monel or 316L and be diffusion-bonded into graded multi-layer stacks.

Typical Applications

• Fuel-cell and electrolyzer screens: Nickel current-collection and gas-diffusion meshes with controlled open area.
• Analytical instrument filters: Precision inlet frits and particle-separation screens for chromatography and lab devices.
• Aerospace and hydraulic filters: Burr-free, high-strength screens for fluid and fuel filtration.
• Battery and electrode meshes: Conductive nickel grids used as current collectors and support structures.
• Food and chemical processing: Corrosion-resistant filter elements that withstand repeated cleaning cycles.
• Acoustic and EMI screens: Fine-aperture meshes that double as protective and shielding layers.

Design Notes & Process Considerations

1. Ligament versus thickness: Keep the ligament at least roughly equal to stock thickness to avoid hole breakthrough and weak webs.
2. Hole diameter tolerance: State diameter and open area together; a tight diameter alone does not guarantee flow performance.
3. Wall taper: Note whether straight or tapered walls are required for directional flow or cake release.
4. Open area and flow: Relate open-area percentage to target pressure drop and verify on a sample under real media.
5. Flatness for sealing: Call out flatness per 100 mm so the screen seals evenly and does not bypass unfiltered flow.
6. Panel utilization: Nest meshes with shared fiducials and account for etch undercut at the sheet edge to maximize yield.