Overview

Filter mesh chemical etching forms apertures in thin metal sheet by photochemical machining rather than weaving wire or punching a perforated plate. A photoresist layer is exposed with the mesh pattern, developed, and the open areas are dissolved in a chemistry matched to the alloy, which leaves straight-walled holes on a repeatable pitch. Because the pattern lives in the artwork, aperture size, strand width and open area can be set independently, and a single panel can carry several aperture zones without extra tooling. Stock is normally 304/316L stainless steel, copper or nickel between 0.05 mm and 0.6 mm, with apertures down to 0.08 mm.

What matters in filtration is rarely the nominal hole size on its own. Flow rate and pressure drop follow the open area, while particle retention and cleanability follow wall taper and surface finish. An etched screen holds its aperture within a narrow band across the full sheet, keeps walls close to vertical, and leaves no rolled edge or burr where fibres and fine grit can catch. That combination is why filter mesh chemical etching is chosen for hydraulic lines, fuel systems, polymer melt packs and air intake screens where a stamped perforated plate would clog or shed particles.

Parameter Window

• Available Materials: 304/316L stainless steel, copper, nickel, nickel-plated steel
• Material Thickness Range: 0.05–0.6 mm
• Tolerance: ±0.05 mm on outline dimensions, ±0.01 mm on aperture size
• Minimum Feature: 0.08 mm aperture with 0.06 mm strand at 0.1 mm stock
• Surface Options: passivation, electropolishing, ultrasonic degreasing, annealed flat, supplied framed or as loose blanks
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Flow Review — Convert the filtration requirement into open area, aperture and strand width, then check the numbers against the target flow and allowable pressure drop.
2. Material Selection — Pick alloy and temper for the medium; 316L for chloride or wash-down duty, copper for thermal and electrical work, nickel for aggressive chemistry.
3. Cleaning & Lamination — Degrease the sheet and laminate dry film resist under controlled heat and pressure so no bubble sits over a fine aperture.
4. UV Exposure — Expose through high-resolution film registered to the sheet edge, keeping the whole panel on one origin.
5. Development — Wash out unexposed resist to open the hole pattern, then inspect strand width before any metal is removed.
6. Etching — Spray the sheet in chemistry matched to the alloy; time, temperature and conveyor speed set aperture size and wall taper together.
7. Stripping & Finishing — Remove resist, neutralise, then passivate or electropolish to smooth the bore and release trapped particles.
8. Inspection & Packaging — Measure aperture, open area and flatness against the approved sample, then interleave and pack on clean liner.

Core Advantages

1. Open area set by design: Aperture and strand width are drawn, so 15% to 65% open area can be dialled in for a target flow instead of being fixed by a wire weave.
2. Straight, burr-free walls: Chemical removal leaves no roll-over, so particles release on backflush and do not wedge into the bore.
3. Repeatable aperture: Every hole on the panel etches at the same rate, holding aperture spread tight enough for rated micron retention.
4. No tooling cost: A new pore pattern is a new film, so prototype screens and revised flow ratings stay affordable.
5. Zoned patterns on one sheet: Coarse pre-filter and fine final-filter areas can sit on the same part with a shared frame and gasket land.
6. Flat, gasket-ready parts: Screens leave the bath flat, so seals seat evenly and the element drops into its housing without distortion.

Typical Applications

• Hydraulic suction screens: Fine aperture discs that protect pumps while keeping pressure drop predictable across the element.
• Fuel and oil filter media: Etched stainless support layers that back a pleated medium and hold it against collapse.
• Polymer melt filter packs: Robust screens for extruders where uniform open area controls pressure build-up.
• Air intake and breather screens: Coarse aperture panels that stop insects and debris without choking airflow.
• Medical and lab filtration: Small-format screens with clean bores for sample preparation and inline filtration.
• Water treatment cartridges: Corrosion-resistant 316L screens for backwash duty in chloride-bearing water.

Design Notes & Process Considerations

1. Size the open area first: Start from flow and allowable pressure drop, then derive strand width; a screen matched on aperture but starved of open area will throttle the line.
2. Keep strand above the floor: At 0.1 mm stock, hold strands at 0.06 mm or more, otherwise the mesh distorts or tears during stripping.
3. Balance aperture against thickness: An aperture much larger than the stock gives a fragile web; an aperture far smaller than the stock etches slowly and tapers.
4. Specify wall taper: State whether straight walls or a slight taper is acceptable, since taper changes effective retention and cleanability.
5. Define the sealing land: Leave a solid border of at least 1.5 mm for gaskets, welding or over-moulding, and keep it free of apertures.
6. Plan for cleaning: Electropolishing after etching reduces surface roughness and helps backflush release, which matters on reusable elements.