Overview

A precision micro-perforated sheet is a thin metal foil carrying a dense, accurately repeated array of sub-millimetre holes, produced by photochemical etching rather than by punching, drilling or laser perforation. A photoresist mask is imaged on both faces of the sheet, the unprotected metal is dissolved in a controlled etchant, and thousands of round or shaped apertures are opened simultaneously. Because the holes are formed chemically, the foil leaves the line flat, burr-free and free of recast layers or heat-affected zones, with every aperture in the array sharing the same diameter and wall profile. Stock is typically 0.03–0.8 mm stainless steel 304/316L, copper, brass, nickel, aluminium or titanium, and hole diameters from 0.08 mm upward are routine.

Engineers specify a precision micro-perforated sheet when they need a controlled open area, predictable airflow or acoustic absorption, and a clean, undistorted surface across a large panel. Etching holds hole-diameter scatter to a few microns over a full sheet and lets pitch, hole shape and open-area ratio vary within one layout at no tooling cost — staggered arrays, graded densities and shaped slots are simply artwork changes. Typical uses include micro-perforated acoustic absorbers, precision filter and sieve elements, speaker and microphone grilles, vacuum-chuck and air-bearing surfaces, EMI vent panels and backlit decorative screens. Compared with woven mesh, an etched foil is a single rigid, dimensionally stable layer that bonds, frames and cleans more easily.

Parameter Window

• Available Materials: stainless steel 304/316L, copper, brass, nickel, aluminium, titanium
• Material Thickness Range: 0.03–0.8 mm
• Tolerance: hole diameter ±0.01–0.02 mm, hole position ±0.03 mm, outline ±0.05 mm
• Minimum Feature: hole diameter down to 0.08 mm (≥1.0–1.2 × thickness), minimum web 0.08 mm, open area 5–45%
• Surface Options: as-etched, passivated, electropolished, brushed, Ni plating, adhesive backing, framed or laminated panels
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Array Design — Build the CAD hole array, set diameter, pitch, stagger and open-area ratio, and define edge margins for framing.
2. Material Selection — Choose thin rolled foil and temper; 304/316L for corrosion, copper for conductivity, half-hard grades for flatness.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces so micro apertures etch through the full thickness.
4. Dual-Side Exposure — Register top and bottom phototools and expose through high-resolution film to keep both-side holes concentric.
5. Development — Wash out the hole areas on both faces and inspect under magnification for scummed or blocked micro holes.
6. Controlled Etching — Spray-etch from both sides, tuning time, temperature and pressure for hole roundness and sidewall taper.
7. Stripping & Finishing — Strip resist, neutralize, then passivate, electropolish or plate; flatten or frame the panel as required.
8. Inspection & Packaging — Verify hole diameter, open area, pitch and flatness by optical measurement, then pack between protective liners.

Core Advantages

1. Dense arrays without tooling: Photochemical etching opens thousands of micro holes at once, so a new pattern needs only a new film, not a punch die.
2. Burr-free, stress-free holes: Chemical removal leaves no rolled burr, recast layer or residual stress, so the sheet stays flat and bonds evenly.
3. Uniform holes across the panel: All apertures etch at the same rate, holding diameter scatter within microns from edge to edge.
4. Pattern freedom in one run: Graded pitch, mixed hole shapes and shaped slots are artwork changes with no added tooling cost.
5. Thin foils handled cleanly: Foils down to 0.03 mm are processed on carriers, avoiding the distortion that mechanical perforation causes.
6. Material and finish flexibility: A precision micro-perforated sheet can be run in stainless, copper, nickel or aluminium and finished or framed to suit the assembly.

Typical Applications

• Micro-perforated acoustic absorbers: Helmholtz-type panels with tuned hole diameter and open area for studio and equipment noise control.
• Precision filtration and sieving: Rigid single-layer filter elements for fine powders, inks and laboratory screening.
• Speaker and microphone grilles: Fine hole arrays that pass sound while keeping dust and particles out of the driver.
• Vacuum chucks and air bearings: Evenly distributed micro holes that distribute suction or air film across a flat work surface.
• EMI vent panels: Conductive aperture arrays providing airflow while maintaining shielding continuity in enclosures.
• Backlit and decorative screens: Uniform micro holes for light diffusion, display windows and architectural cladding.

Design Notes & Process Considerations

1. Hole diameter versus thickness: Keep the smallest hole at least equal to material thickness, or undercut makes holes tapered, oval or closed.
2. Web width and open area: Maintain a minimum web of 0.08–0.1 mm between holes; very high open area weakens the panel and risks tearing.
3. Etch factor compensation: Because etching is isotropic, artwork is offset for undercut — specify whether the stated hole diameter applies at the surface or mid-thickness.
4. Pitch, pattern and margins: Choose square or staggered arrays and leave unperforated edge margins for framing, bonding or sealing.
5. Flatness and handling: Thin sheets need a carrier or frame and, where needed, a flattening anneal; require wrinkle-free, burr-free edges.
6. Tolerance callout and inspection: State measured hole diameter, open-area ratio and sampling plan so a precision micro-perforated sheet is accepted consistently batch to batch.