Photochemical Etching For Finer Features Than Weaving
Velp has added photochemical etching mesh capability for buyers who need aperture and feature sizes below what woven cloth can achieve. The process produces burr-free stainless filter screens with apertures down to 0.04 mm, plus slotted and patterned parts that would be difficult to stamp or laser cut at production scale.
Etching works from a photoresist mask applied to both sheet faces, so the same pattern is produced on every part without tool wear. That means the first piece and the ten-thousandth piece are dimensionally identical - a significant advantage for medical, analytical and electronics customers.
Capability Range
- Fine filter screens - 0.04 mm minimum hole size with high open area for precision filtration.
- Slotted mesh - rectangular slots for sieving and fuel or hydraulic screens.
- Patterned parts - encoder discs, speaker grilles, decorative inserts and shielding screens.
- Framed assemblies - etched screens laminated or welded into customer frames.
Technical Parameters
| Parameter |
Range |
| Material |
SS304, SS316, SS316L, copper, brass, nickel, titanium |
| Sheet thickness |
0.03 - 1.0 mm |
| Minimum hole |
0.04 mm |
| Maximum part size |
500 x 500 mm |
| Tolerance |
+/- 0.01 mm on feature position |
| Edge quality |
Burr free, no heat affected zone |
| MOQ |
100 pcs or 10 sqm |
Where Etched Mesh Replaces Woven Cloth
Woven cloth is limited by wire diameter: below roughly 25 micron wire, handling and durability become problematic. Etched mesh produces the aperture in solid sheet instead, so a 0.05 mm sheet can carry a 0.04 mm hole pattern and still be handled and welded. This is why etched screens are preferred in analytical instruments, fuel injector filters, medical devices and precision air and liquid filtration.
Etching also avoids the mechanical stress of stamping, so thin parts stay flat. Velp supplies parts on protective film, in trays or on wafer-style carriers for automated assembly lines.
Development Support
Velp accepts customer CAD files and produces first articles for fit and flow testing before production tooling is committed. Because the process uses a digital mask rather than a physical die, design changes require no new tooling cost - a practical benefit for equipment makers iterating on prototypes.
About Velp
Velp was established in 2000 in Anping, Hebei, China. It employs 180-190 staff, exports 80-90% of its output and holds SGS, CE, ISO9002 and BV certification. The company produces etching mesh, filter mesh, perforated metal, expanded metal and welded mesh.
Send your drawing, material and flow requirement to the Velp precision team for a feasibility review and quotation.
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