Overview

An etched perforated metal sheet is produced by photochemical machining, where a resist pattern defines every hole and the unprotected metal is dissolved away in an etchant. Unlike mechanically punched or drilled sheet, etching opens each hole from both sides with no contact force, so the finished sheet stays perfectly flat and every aperture has a clean, burr-free edge. This is what lets an etched perforated metal sheet hold very small holes, very tight pitches and high open areas that would tear, deform or work-harden under a punch press.

The technique is used wherever hole density and open-area ratio matter more than raw throughput — fine screens, filter supports, speaker grilles, battery venting, ink filters, sensor guards and decorative mesh. Sheets are usually stainless steel 304/316L, aluminum or copper, from 0.05 mm to 2.0 mm thick, with hole diameters down to about 0.1 mm and open-area ratios tuned by the artwork rather than by tooling. Because the pattern is a digital file, hole size, pitch, stagger and percentage of open area can all be revised between runs at zero tooling cost.

Parameter Window

• Available Materials: stainless steel 304/316L, aluminum (1050/5052), copper C1100, nickel
• Material Thickness Range: 0.05–2.0 mm
• Tolerance: hole diameter ±0.025 mm, pitch ±0.05 mm across the panel
• Minimum Feature: hole diameter down to 0.1 mm, minimum web 0.1 mm
• Surface Options: as-etched, electropolished, passivated, anodized (aluminum), nickel plated
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Pattern & Open-Area Review — Convert the hole layout to vector artwork and calculate hole diameter, pitch and percentage of open area from the drawing.
2. Material Selection — Pick stainless for corrosion resistance, aluminum for weight, or copper for conductivity; confirm thickness against hole size.
3. Cleaning & Lamination — Degrease the sheet and laminate dry film resist on both sides so holes can be etched from entry and exit simultaneously.
4. Double-Side Exposure — Expose the pattern with front-to-back registration so every hole is straight, round and centered on its web.
5. Development — Wash out unexposed resist and inspect the opened holes under magnification for residue or under-development.
6. Etching — Spray etch with chemistry matched to the alloy, controlling time, temperature and pressure to reach diameter while limiting undercut.
7. Stripping & Finishing — Strip resist, neutralize, then electropolish, passivate or anodize to smooth edges and set the surface finish.
8. Inspection & Packaging — Measure hole diameter, pitch and open area optically, check flatness, and pack sheets flat with interleaving.

Core Advantages

1. Dead-flat sheets: Chemical removal applies no mechanical force, so large perforated panels stay flat without the bow or set of a punch press.
2. High open area without tearing: Fine webs and dense hole counts that would tear under punching hold their shape because nothing touches the sheet.
3. Burr-free holes: Each hole is etched from both sides, leaving a clean edge that needs no deburring and will not snag or cut.
4. Zero tooling: The hole pattern lives in a film, so hole size, pitch and open area change freely between orders at no die cost.
5. Any alloy: Stainless, aluminum and copper run on the same line, letting one order mix materials for different stages of a filter stack.
6. Batch-to-batch repeat: Every hole on a sheet etches at the same rate, so open area and flow stay consistent across the whole run.

Typical Applications

• Fine filter screens: Dense micro-perforations for liquid and gas filtration where a clean edge prevents fiber shedding.
• Filter support layers: Flat support sheets that back a membrane without deforming it.
• Speaker grilles: Fine, uniform holes for acoustic covers that stay flat and open.
• Battery venting plates: Controlled open area for pressure equalization in cell housings.
• Sensor and encoder guards: Protective perforated covers that pass signal while shielding the element.
• Decorative mesh: Architectural and appliance panels where the perforation pattern is the visible feature.

Design Notes & Process Considerations

1. Hole size versus thickness: Keep the minimum hole diameter at least 1× material thickness; below that, the hole begins to taper from the center.
2. Web width: Keep the land between holes at least 1× thickness so fine webs do not distort or merge during etch.
3. Open-area ratio: State the target open area as a percentage; it is set by hole size, pitch and stagger, not by guesswork.
4. Hole geometry: Specify round, square, slot or hexagonal holes, since each produces a different flow and appearance.
5. Flatness callout: For large panels, specify flatness per 300 mm, because very thin sheets with high open area can flex in handling.
6. Edge and surface finish: Name electropolish or passivation for corrosive service; anodize aluminum where color and hardness are required.