Overview

Stainless steel filter mesh etching produces perforated screens by dissolving a patterned array of holes through thin 304/316L stainless sheet instead of punching or weaving wire, so every aperture is identical, the surface stays flat and no burr is left to shed into the flow. A photoresist mask is imaged on both faces of the sheet, developed, and the exposed metal is removed from each side until the holes meet, giving straight walls and a controlled open area up to about 60%. Stock from 0.05 mm to 0.5 mm is common, with hole diameter held near ±0.01 mm and a minimum aperture around 0.08 mm supported by webs as narrow as 0.06 mm. Because the pattern is defined by artwork rather than a die, changing pore size or pitch costs a new film, not a new tool.

For filtration buyers, stainless steel filter mesh etching solves three recurring problems: woven wire shifts under pressure and sheds fibres, punched screens carry burrs and tapered holes, and both struggle to hold a precise micron rating across a batch. Photochemical machining keeps hole size, position and open area uniform from the first sheet to the thousandth, so flow rate and particle cut-point stay predictable. An etched screen can also mix hole diameters, add a solid rim, include mounting slots and carry a part number in the same pass, which simplifies the stack-up inside a filter housing.

Parameter Window

• Available Materials: 304/316L stainless steel
• Material Thickness Range: 0.05–0.5 mm
• Tolerance: ±0.01 mm on hole diameter, ±0.02 mm on hole position
• Minimum Feature: 0.08 mm aperture, 0.06 mm web, open area up to 60%
• Surface Options: electropolishing, pickling and passivation, ultrasonic cleaning
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork Review — Lay out the hole array, check web width against stock thickness, and confirm open-area ratio and rim width.
2. Material Selection — Choose 304 for general service or 316L for chloride and chemical exposure, and verify sheet flatness.
3. Cleaning & Lamination — Degrease and laminate dry-film resist to both faces so apertures etch symmetrically from each side.
4. Dual-side Exposure — Expose the front and back patterns in registration so the holes align and meet mid-thickness.
5. Development — Wash out unexposed resist from both sides and inspect for blocked or under-developed apertures.
6. Etching — Spray etchant matched to the grade; time and conveyor speed set wall straightness and final hole diameter.
7. Stripping & Finishing — Remove resist, neutralize, then electropolish, passivate and ultrasonically clean to clear residue.
8. Inspection & Packaging — Gauge hole diameter, open area and flatness against the approved sample, then pack between liners.

Core Advantages

1. Uniform apertures: Every hole is imaged from the same artwork, so pore size and micron rating do not drift across a sheet.
2. Burr-free flat screens: Chemical removal leaves no rolled edge, so screens seal cleanly in a housing and do not shed particles.
3. High open area: Webs down to 0.06 mm allow open area near 60% without the weak points of woven wire.
4. Repeatable flow: Constant hole size and pitch keep pressure drop and flow rate predictable from batch to batch.
5. Low tooling cost: A new pore pattern is a new film, making custom ratings and short runs economical.
6. Integrated rim and slots: Stainless steel filter mesh etching can add a solid border, mounting holes and identification in one operation.

Typical Applications

• Fuel and hydraulic filters: Precision screens that hold a defined particle cut-point under pressure.
• Chemical process sieves: 316L screens resistant to corrosive media and repeated cleaning.
• Water treatment: Perforated elements for pre-filtration and membrane support.
• Coffee and beverage machines: Fine, burr-free screens that rinse clean and resist staining.
• Pharmaceutical fluid filtration: Passivated meshes with uniform pores for sterile liquid paths.
• Vacuum and vent screens: Flat apertures used as flame arrestors or sensor protection grids.

Design Notes & Process Considerations

1. Web versus thickness: Keep the web at no less than 1.2 × stock thickness, or holes will merge and the sheet will warp.
2. Open-area callout: State the target open-area ratio; it drives both pressure drop and mechanical strength.
3. Hole tolerance: Specify diameter tolerance and whether it applies before or after electropolishing, which enlarges apertures slightly.
4. Rim and datum: Reserve a solid border and datum holes for clamping, especially on large thin panels.
5. Flatness: Call out flatness per 100 mm when the screen is clamped in a sealing stack.
6. Cleanliness: Stainless steel filter mesh etching should be followed by ultrasonic cleaning and lint-free packing for critical fluid paths.