Precision etched components refer to custom metal parts fabricated by photochemical (chemical) etching, a subtractive manufacturing technique that selectively removes material from thin metal sheets using photoresist masking and chemical etchant. This process creates intricate micro geometries that are difficult or uneconomical to produce with stamping, laser cutting or CNC machining.

From ultra-fine meshes, encoder discs, spring contacts, SMT stencils, bipolar plates, shims and lead frames to medical Nitinol components, precision etched components cover a wide spectrum of thin-gauge metal parts. The technology works with many engineering metals including stainless steel, copper, phosphor bronze, Kovar, nickel, molybdenum, titanium and nitinol.

Etching Workflow

1. Material Pre-treatment: Thin metal foil undergoes degreasing and surface cleaning to eliminate oil, oxidation and contaminants, preventing pinholes and pattern defects.
2. Photoresist Lamination: Dry film photoresist is laminated onto one or both sides of the metal substrate to form a protective mask layer.
3. UV Exposure & Development: UV light transfers CAD-defined patterns onto photoresist. Development washes away unexposed resist to expose areas ready for etching.
4. Controlled Spray Etching: Automated conveyor spray etching precisely removes exposed metal. Parameters including temperature, etchant concentration and pressure are stabilized to maintain consistent depth and geometry. Both through-etch and half-etch options are available.
5. Resist Stripping & Final Cleaning: Remaining photoresist is stripped. Parts are fully rinsed and dried to remove chemical residues.
6. Dimensional Inspection & Post-processing: Micron-level dimensional and visual inspection. Optional secondary processes include coating, heat treatment, forming and surface finishing according to requirements.

Core Advantages

• Zero burr and no residual mechanical stress: No cutting or stamping force, so parts remain flat without microcracks or deformation.
• High design flexibility: No expensive hard tooling. Prototypes and design revisions can be completed quickly at low cost.
• Micron tolerance capability: Precise control of feature size, hole diameter and etch depth for micro-scale features.
• Uniformity across batches: Consistent part geometry from the first prototype to mass production.
• Wide material compatibility: Supports most thin engineering metals and shape memory alloys.
• Smooth surface finish: Etched surfaces avoid heat-affected zones, preserving original material electrical and mechanical properties.

Application Fields

• Semiconductor & electronics: Lead frames, shadow masks, BGA / FCBGA stencils, ultra-fine metal mesh
• Hydrogen energy: Fuel cell metal bipolar plates
• Medical industry: Nitinol surgical components, precision filters, medical spring parts
• Aerospace & unmanned equipment: Encoder discs, shims, spacers
• Consumer electronics: Speaker grilles, EMI shielding sheets, contact springs
• Industrial filtration: Precision metal filter meshes and screens

Design & Process Notes

1. Feature width and metal thickness follow standard etching design rules; minimum feature size is usually correlated with material thickness.
2. Side undercut must be considered during pattern design to ensure final dimensional accuracy.
3. Half-etch (depth-controlled etching) is available for partial-depth features such as channels and indentations.
4. Thin substrates require careful handling throughout production to avoid warpage.
5. Secondary treatments like plating, conductive coating or passivation can be added to enhance corrosion resistance and conductivity.