Overview

Etched 304 stainless steel mesh is manufactured by photochemical machining, a controlled subtractive route that dissolves the unprotected areas of a photoresist-masked 304 sheet to leave a precise lattice of apertures and strands. The mesh artwork is imaged onto dry-film resist, developed to open the hole areas, and the exposed metal is removed in a ferric-chloride chemistry tuned to austenitic stainless steel, so hole diameter, pitch and strand width are governed by the film and etch dwell rather than by punch force or tool wear. Standard gauges run from 0.05 mm to 0.5 mm, and round, square, slot and hexagonal arrays are all produced from the same digital master.

For OEM buyers, etched 304 stainless steel mesh addresses three recurring problems: thin stainless foil curls, tears and wears dies when stamped with fine holes; filtration and screening parts demand open areas above 60% with holes down to 0.10 mm that are hard to hold by punching or laser; and 304 is sensitive to heat input, so laser dross and discoloration can compromise later welding, plating or lamination. Because every aperture on a panel forms at the same rate, dimensional repeatability holds from the first article through volume runs, while the chromium-oxide passive film that gives 304 its corrosion resistance is preserved. New patterns need only a new film, which suits multi-spec, low-volume and frequently revised custom programs.

Parameter Window

• Available Materials: 304/316L austenitic stainless, also 301, copper and nickel for mixed builds
• Material Thickness Range: 0.05–0.5 mm (common 0.1 / 0.2 / 0.3 mm)
• Tolerance: ±0.02 mm on hole diameter, ±0.03 mm on strand width, ±0.05 mm on outline
• Minimum Feature: 0.10 mm hole, 0.08 mm strand/line width, 0.15 mm pitch
• Surface Options: nitric passivation, electropolishing, electrolytic coloring, light sandblast, ultrasonic cleaning
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Nesting — Vectorize the hole array, verify hole-to-thickness ratio, and plan panel layout with tie bars and registration marks.
2. Material Certification & Prep — Confirm 304 grade, mill certificate and thickness, inspect for scratches and flatness, then shear to exposure size.
3. Cleaning & Lamination — Degrease and laminate dry-film resist under matched heat and pressure so no bubbles sit under fine strands.
4. UV Exposure — Expose through high-resolution film with the array registered to the sheet edge for panel-level consistency.
5. Development — Wash out unexposed resist to open hole areas and inspect for residue that would block etching.
6. Controlled Etching — Spray ferric-chloride chemistry, tuning time, temperature and conveyor speed to hold sidewalls and avoid strand thinning.
7. Stripping & Passivation — Remove resist, neutralize, then nitric-acid passivate to strip free iron and restore the chromium-oxide film.
8. Inspection & Packaging — Measure hole diameter, strand width and open area on a vision system, verify flatness, then pack on liner or clean trays.

Core Advantages

1. Burr-free open area: Chemical removal leaves no rolled edge or burr, so flow resistance stays stable and no particles shed into the media.
2. No die cost: Each new mesh pattern is a new film, keeping prototypes and frequent revisions economical without a stamping tool.
3. Corrosion-resistant and cleanable: The 304 passive film resists mild acids, alkalis and common cleaners, so screens tolerate repeated back-flushing.
4. Repeatable fine holes: 0.10 mm holes and 0.08 mm strands form together across a panel with tight aperture spread and uniform open area.
5. Stress-free flatness: With no shear or heat input, thin sheet stays flat, so welding, plating or laminating will not warp it.
6. Fast custom turnaround: From drawing to sample, this mesh service lets hole size, shape and frame be tuned item by item for non-standard equipment.

Typical Applications

• Industrial filtration: Hydraulic-oil, coating and chemical-liquid screens with uniform holes and back-flush tolerance.
• Food screening: Grading screens for grain, powder and sugar that passivate clean and resist residue build-up.
• Protective ventilation: Dust and airflow guards for enclosures, motors and instruments balancing open area and stiffness.
• EMI shielding: Shielded vent panels whose fine-aperture arrays attenuate interference while passing air.
• Acoustic dust guards: Microphone and sensor meshes in thin foil that balance sound transmission and particle blocking.
• Battery flow fields: Flow-field support meshes for fuel cells and electrolyzers where uniform apertures even out media distribution.

Design Notes & Process Considerations

1. Hole-to-thickness ratio: Keep hole diameter at or above material thickness; too small a hole distorts from undercut and thins the strand.
2. Open-area callout: State hole diameter, pitch and open-area percentage, and define round, square or hex arrays rather than only a mesh count.
3. Grade and temper: Choose 304 or 316L by corrosion and strength needs, note soft or hard temper, and state certificate requirements.
4. Nesting and tie bars: Leave enough tie bars and process borders, and specify the final cut method so thin webs survive stripping and cleaning.
5. Thin-foil handling: For foil below 0.1 mm, specify a carrier or liner and call out flatness and cleanliness to avoid creases and fingerprints.
6. Surface and tolerance: With etched 304 stainless steel mesh, define passivation or polishing and key-hole tolerances, especially for food and clean-duty parts.