Overview

Copper mesh etching uses photochemical machining to produce a flat copper sheet pierced with a uniform grid of apertures for conductive screens. A photoresist is laminated, exposed with the grid artwork and developed, then the unprotected copper is dissolved in a matched etchant to leave a clean, dense lattice. Meshes are typically made from pure copper (C11000 or oxygen-free C10200) in gauges from 0.02 mm to 0.5 mm. Because the metal is chemically removed, the grid is monolithic and burr-free, with no crossing wires, weld points or loose strands.

Copper is chosen where conductivity, thermal transfer and a fine, uniform grid matter at once. Etching holds aperture size and pitch to a tight tolerance across the full sheet, so shielding, filtration and heat-transfer behavior stay predictable. Copper also solders and bonds easily, which suits it to RFI shielding, current distribution and heat spreading. This is why copper mesh etching is specified for shielding windows, battery current collectors, heat-transfer screens and fine filters where a woven or punched alternative would shed fibers or leave burrs.

Parameter Window

• Available Materials: pure copper C11000, oxygen-free copper C10200
• Material Thickness Range: 0.02–0.5 mm
• Tolerance: ±0.02 mm on aperture, ±0.01 mm on bar width
• Minimum Feature: 0.05 mm aperture, 0.03 mm bar width
• Surface Options: bright, electropolished, tin or nickel plated, anti-tarnish
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Grid Design — Convert the hole pattern to vector artwork, set bar width at or above thickness, and confirm open area.
2. Material Selection — Choose C11000 for standard use or oxygen-free C10200 for low-oxidation or bonding applications.
3. Cleaning & Lamination — Degrease the sheet and laminate dry film on both sides for even two-sided etching.
4. UV Exposure — Expose front and back artwork registered to within 0.01 mm for straight, centered walls.
5. Development — Wash out the unexposed resist to open every aperture, then inspect for blocked fine holes.
6. Etching — Spray etch from both sides at controlled temperature; aperture size is set by time and pressure.
7. Stripping & Finishing — Remove resist, neutralize, then electropolish or apply tin, nickel or anti-tarnish coating.
8. Inspection & Packaging — Measure aperture and pitch on a vision system, then pack dry to prevent oxidation.

Core Advantages

1. Dense uniform grid: Apertures and pitch are held to microns, giving predictable shielding and flow across the sheet.
2. High conductivity: Copper carries current and heat better than most screen metals, ideal for RFI and thermal use.
3. Monolithic construction: The one-piece grid has no crossing wires or welds to shed fibers or trap debris.
4. Easy to bond: Copper solders, welds and bonds readily, simplifying integration into assemblies.
5. Burr-free and flat: Chemical removal leaves no punch burrs, so the mesh seats flat and handles cleanly.
6. Fine geometry: Apertures down to 0.05 mm with bars as fine as 0.03 mm are routine.

Typical Applications

• RFI shielding windows: Conductive copper grids for electromagnetic shielding.
• Battery current collectors: Fine copper meshes for electrodes and energy storage.
• Heat-transfer screens: Copper grids for heat spreading and thermal management.
• Fine filtration: Dense copper screens for fluid and gas filtration.
• EMI gaskets: Conductive copper mesh for gasket and shielding contact.
• Sensor grids: Conductive copper meshes for sensing and detection elements.

Design Notes & Process Considerations

1. Aperture versus thickness: Keep aperture diameter at 1.2 × material thickness or more for straight, consistent walls.
2. Bar width: Specify bar width at or above material thickness so the grid keeps its strength.
3. Open area: State the open-area percentage; it controls flow, strength and shielding effectiveness.
4. Purity grade: Choose C11000 for standard work or oxygen-free C10200 where oxidation or bonding matters.
5. Surface finish: Call out anti-tarnish or plating to prevent oxidation in humid environments.
6. Flatness: Specify flatness per 100 mm if the mesh must bond to a substrate or seal against a frame.