Specifying copper foil 0.005 mm (5 µm) creates a different procurement problem than buying standard 18 µm or 35 µm foil. At this thickness, handling, flatness, temper and edge quality often matter more than alloy selection alone. This guide is written for engineers, R&D staff and purchasing teams who need to evaluate suppliers, prepare RFQs and decide whether optional laser processing is appropriate for a thin copper foil component.
Material Snapshot
The table below summarizes the typical material profile for copper foil 0.005 mm. Availability, temper, backing and tolerance band depend on project requirements.
| Material | Typical Form | Typical Thickness Discussion | Key Properties | Common Applications | Documents Often Requested |
|---|---|---|---|---|---|
| Copper foil 0.005 mm (5 µm) | Rolled/wrought or electrodeposited foil; slit coil, sheet, or custom cut blank. Supply form depends on project requirements. | 0.005 mm is a common nominal target for fine-pitch and micro-aperture work. Actual available foil thickness, backing and tolerance band depend on project requirements, alloy temper and supplier capability. | High electrical conductivity, high thermal conductivity, ductility, low mass per area. Sensitive to wrinkles, pinholes, edge deformation and handling marks. | Fine metal mask, shadow mask, precision shim, EMI shielding, micro perforated filter, battery current collector, medical R&D component. | MTC, SDS, TDS, CoA, RoHS, REACH, inspection report or dimensional conformance report as applicable. |
Engineering Selection Notes
Copper foil 0.005 mm should not be specified as only “5 µm copper.” The following selection points control whether the material can be handled, measured and processed reliably.
Dimensional and Mechanical Factors
- Thickness measurement method: Contact gauge force and local deflection can affect readings at 5 µm. Non-contact optical measurement may be required.
- Flatness: Foil in this class may show curl, edge wave, or center buckle. Specify flatness zone, sag allowance, or mounting requirements if the part will be registered or laminated.
- Temper: Annealed, quarter-hard, half-hard or full-hard behavior affects handling, springback, formability and laser cutting response.
- Surface finish: Rolled foils may have different roughness on each side. Electrodeposited foils may have matte and drum-side differences. Surface roughness affects adhesion, coating, solderability and optical appearance.
- Burr and edge sensitivity: Thin copper foil tears easily. Mechanical cutting can produce burrs, necking or edge deformation. If the edge is functional, define edge quality, burr direction and allowed recast.
- Heat input: Copper reflects certain laser wavelengths and conducts heat quickly. Process selection must consider thermal spread, oxidation and localized softening.
- Inspection method: Define what will be measured: thickness, hole diameter, slot width, pitch, flatness, burr height, contamination, pinhole count.
- Drawing clarity: The drawing should state nominal thickness, tolerance, grain direction if relevant, surface side, edge quality and inspection method. Missing data on a 5 µm foil drawing usually increases quotation delay and risk.
Processing Notes
Feasibility of laser micromachining for copper foil at 0.005 mm depends on material, thickness, geometry, drawing quality and inspection requirements. A drawing-based feasibility review is required before a supplier can confirm process suitability.
Laser Cutting and Micro Features
Femtosecond laser processing and picosecond laser cutting are often evaluated for ultra-thin copper because they can produce low thermal impact and reduced heat-affected zone compared with longer-pulse or thermal cutting methods. However, copper’s high thermal conductivity still requires careful beam placement, power control and fixture design. Do not assume a fixed kerf width. Kerf, taper and edge recast must be validated on the actual material.
Micro Hole Drilling and Slot Cutting
Micro hole drilling and micro slot cutting in 0.005 mm copper foil can be used for fine aperture masks, perforated filters and shadow masks. Laser selection, assist gas and pulse energy are typically reviewed case by case. For functional apertures, inspection should include diameter, pitch, roundness, taper and burr height. Process capability should be evaluated against the drawing and required inspection standard.
Application Scenarios
0.005 mm copper foil is not a stock item in every alloy, temper or width. The following application scenarios show why engineers specify this thickness.
- Fine metal mask / shadow mask: 5 µm copper foil can support fine aperture arrays with low mask shadowing. Edge straightness and aperture position accuracy are typically critical.
- SMT stencil: Ultra-thin copper foil may be evaluated for fine-pitch solder paste deposition. Thickness tolerance and aperture release characteristics need validation.
- Micro aperture mask: Used in evaporation, sputtering or particle-blocking test fixtures. Pinhole density, aperture taper and foil flatness affect pattern fidelity.
- Micro perforated filter: Thin copper foil can be laser-perforated for controlled open area. Slit width, spacing and burr direction are functional variables.
- Precision shim: 0.005 mm copper can serve as a conductive or thermal shim. Edge burr, thickness tolerance and cleanliness are often required.
- Battery current collector / R&D anode: Ultra-thin copper foil is used in battery and energy storage research. Surface cleanliness, pinholes and mechanical handling are key.
- EMI shielding: Thin copper foil may be applied as shielding or as a conductive layer in layered structures. Surface roughness and adhesion matter.
- Medical R&D / scientific instrument part: Micro apertures, electrodes or calibration foils may need low contamination and traceable documents.
RFQ / Drawing / Document Checklist
Prepare the following details before requesting a copper foil 0.005 mm supplier quotation. Incomplete data often delays technical review and prevents accurate process selection.
| RFQ Item | What to Specify |
|---|---|
| Material grade | Oxygen-free copper, ETP copper, rolled or electrodeposited. Examples: C10200, C11000 or equivalent. Do not write only “copper foil.” |
| Thickness | 0.005 mm nominal. Include tolerance target, measurement method, and whether a backing or carrier is permitted. |
| Drawing file | DXF/DWG/STEP/PDF with dimensions, datums, critical features and grain direction if relevant. |
| Part size and layout | Outside dimensions, panel or strip design, orientation, keep-out zones and tooling holes. |
| Quantity | Prototype, pilot or volume quantity. Reel or sheet quantity if applicable. |
| Surface requirement | Clean, passivated, coated, laminated, matte/shiny side, no oil, no oxidation. |
| Tolerance target | Linear dimensions, hole diameter, pitch, flatness and thickness tolerance. |
| Inspection requirement | Visual, optical measurement, CMM, SEM, pinhole inspection, burr check, cleanliness. |
| Requested documents | MTC, SDS, TDS, CoA, RoHS, REACH, dimensional report, process capability data if required. |
| Laser processing | Mark clearly which areas require cutting, drilling, slotting or no processing. Provide CAD layers if possible. |
| Handling and packaging | Interleaving paper, plastic film, vacuum packaging, reel ID, label requirements. |
Related Resources
For additional material specifications, see the Copper Foil material page. If you already have a drawing, submit it through the Custom Quote page. Related processing pages include femtosecond laser micromachining, picosecond laser cutting, precision laser cutting and micro hole drilling.
Next Step: Request a Drawing-Based Review
Selecting a copper foil 0.005 mm supplier usually comes down to documented process control, handling capability and whether the supplier can process the foil without introducing damage. Before requesting quotation, consolidate the drawing, tolerance target, surface requirement and inspection method. Submit those details through Finalfoil’s Custom Quote page for a project-specific feasibility review.