Overview

Etched medical mesh is produced by photochemical machining, a chemical process that dissolves unprotected metal to leave a flat sheet pierced with thousands of identical apertures. A photoresist film is laminated, exposed with the aperture artwork and developed, then the bare metal is etched through from one or both sides in a matched chemistry. Typical alloys are 316L stainless steel, commercially pure titanium (Grade 1 and 2) and nickel alloys, supplied between 0.02 mm and 0.5 mm thick. Because the metal is dissolved rather than punched or woven, the mesh leaves the line flat, burr-free and free of the crossing wires, weld joints and work-hardened edges that a woven screen carries.

For medical and surgical screens, aperture uniformity and surface cleanliness decide whether a part is usable. Etching holds every opening to a tight diameter tolerance across a full sheet, so fluid flow and particle retention stay predictable from sample to production. The absence of mechanical contact means there is no embedded debris or frayed wire end, and the parts can be electropolished and passivated to a smooth, low-adhesion surface. This is why etched medical mesh is specified for filtration grids, sizer screens, implantable support screens and laboratory separation media where a woven or stamped alternative would introduce burrs and variance.

Parameter Window

• Available Materials: 316L stainless steel, titanium Grade 1/2, nickel alloys (Hastelloy, Inconel)
• Material Thickness Range: 0.02–0.5 mm
• Tolerance: ±0.02 mm on aperture diameter, ±0.01 mm on strut width
• Minimum Feature: 0.05 mm aperture, 0.03 mm strut width at 0.05 mm stock
• Surface Options: electropolished, passivated, bright annealed, PVD coated
• Compliance: ISO 9001 process control, RoHS/REACH material traceability, cleanroom packaging

Manufacturing Process / Workflow (8 Steps)

1. Aperture Design — Convert the hole pattern to vector artwork, keep strut width at or above material thickness, and confirm the open-area ratio.
2. Material Selection — Choose 316L for corrosion resistance, titanium for low weight, or a nickel alloy for aggressive chemistry, then confirm flatness.
3. Cleaning & Lamination — Degrease the sheet and laminate dry film on both sides so the apertures etch evenly from each face.
4. UV Exposure — Expose front and back artwork registered to within 0.01 mm so the etched walls stay straight and centered.
5. Development — Wash out the unexposed resist to open every aperture, then inspect for blocked or under-developed fine holes.
6. Etching — Spray etch from both sides at controlled temperature; aperture diameter is set by time, pressure and conveyor speed.
7. Stripping & Finishing — Remove resist, neutralize, then electropolish or passivate to remove micro-roughness and hidden burrs.
8. Inspection & Packaging — Measure aperture size and pitch on a vision system, then pack in cleanroom bags with process records.

Core Advantages

1. Uniform apertures: Every hole is etched to the same diameter across the sheet, so flow and particle retention stay predictable.
2. Burr-free and flat: Chemical removal leaves no punched roll-over, giving a flat mesh with no raised edges to trap residue.
3. Biocompatible surfaces: 316L and titanium can be electropolished and passivated for a smooth, low-adhesion, easily cleaned surface.
4. Fine geometry: Apertures down to 0.05 mm with struts as fine as 0.03 mm are routine, finer than common woven screens.
5. One-piece, no welds: The monolithic structure removes weld joints and wire crossings that otherwise harbor contamination.
6. Full traceability: Material heats and process lots are documented, so each sheet of etched medical mesh traces to its alloy certificate.

Typical Applications

• Surgical filtration screens: Fine-aperture meshes for fluid and particulate separation in medical devices.
• Sizer and classifier screens: Particle separation media with tightly controlled opening dimensions.
• Implant support screens: Flat titanium or 316L supports with smooth, tissue-friendly surfaces.
• Laboratory separation media: Sample sieves and filter grids for analytical instruments.
• Aerosol and nebulizer mesh: Uniform micro-apertures for consistent droplet generation.
• Diagnostic filter grids: Precision apertures in analyzer and sensor assemblies.

Design Notes & Process Considerations

1. Aperture versus thickness: Keep aperture diameter at 1.2 × material thickness or more, or the sidewalls taper and flow becomes inconsistent.
2. Strut width: Specify strut width at or above material thickness so the grid does not deform during handling and assembly.
3. Open-area ratio: State the required open-area percentage; it drives both mechanical strength and flow rate.
4. Surface finish: Call out electropolishing or passivation when the mesh contacts tissue or aggressive fluids.
5. Edge condition: Require burr-free, stress-free edges for implant and cleanroom use.
6. Cleanliness: Specify cleanroom packaging and particle limits when the mesh feeds a sterile assembly.