Specifying 316L stainless steel 0.005 mm foil for a precision application requires more than a standard material datasheet. When the target thickness drops to five micrometers, material consistency, flatness, and surface quality become as critical as the chemical composition. This guide provides engineers and procurement professionals with the technical criteria needed to evaluate material supply and custom cutting options for 0.005 mm 316L stainless steel foil, including laser processing feasibility.
Material Snapshot
| Property | Details |
|---|---|
| Material | 316L stainless steel (low carbon, vacuum melted or electro-slag refined grades preferred for thin foil) |
| Typical Form | Coil or cut sheet; thickness depends on project requirements |
| Typical Thickness Discussion | 0.005 mm (5 µm) is at the lower boundary of commercial availability. Thinner variants (e.g., 0.003 mm) may be available but require project-specific evaluation. |
| Key Properties | Corrosion resistance (pitting resistance equivalent number ≥ 25), low magnetic permeability (as-annealed), good formability, biocompatible surface finish options |
| Common Applications | Fine metal masks for OLED deposition, micro aperture arrays, precision shims, battery current collector tabs, micro perforated filters, EMI shielding gaskets, medical R&D test fixtures |
| Documents Often Requested | Mill test certificate (MTC) per EN 10204 3.1, material safety data sheet (MSDS), technical data sheet (TDS), certificate of analysis (CoA), RoHS and REACH declarations |
Engineering Selection Notes
Selecting 316L stainless steel foil at 0.005 mm requires attention to several parameters that are often overlooked in thicker gauges.
Thickness Tolerance and Measurement Method
At 5 µm, thickness tolerance is typically ±10 % of nominal (i.e., ±0.5 µm) for precision-rolled foil. Confirm the measurement method: contact micrometers may deform the foil; non-contact laser or capacitive sensors are preferred. Request the measurement protocol and sampling plan from the supplier.
Flatness and Surface Finish
Foil this thin is sensitive to residual stress from rolling. Specify flatness requirements (e.g., maximum wave height per unit length) if subsequent laser processing or lamination is planned. Surface finish (Ra) should be stated explicitly; standard bright annealed finish (Ra ≤ 0.25 µm) is common, but mirror finish (Ra ≤ 0.05 µm) may be required for optical or mask applications.
Temper and Magnetic Permeability
316L in the annealed condition has very low magnetic permeability (µ ≤ 1.01). Cold-rolled temper increases hardness but also raises permeability. For applications requiring non-magnetic behavior (e.g., electron microscopy components), specify annealed condition and request a permeability test certificate.
Burr Sensitivity
Mechanical cutting (e.g., stamping, shear cutting) of 0.005 mm foil produces burrs that are difficult to remove without damaging the foil. If burr-free edges are required, laser cutting or chemical etching are more appropriate. Discuss burr height limits during the RFQ stage.
Heat Input and Distortion
Conventional laser cutting (nanosecond pulsed or continuous wave) generates heat that can distort 5 µm foil. For geometries with small features or tight positional tolerances, ultrashort pulse laser processing (femtosecond or picosecond) should be evaluated.
Inspection Method
Visual inspection under magnification (10× to 50×) is standard for cut edges. For micro features, optical measurement systems or scanning electron microscopy may be required. Confirm the inspection criteria and acceptance limits before ordering.
Drawing Clarity
Provide dimensioned drawings with explicit tolerances for hole diameter, slot width, edge-to-edge spacing, and overall part outline. Specify datum references and critical-to-function dimensions. A poorly defined drawing is the most common cause of rework in thin foil processing.
Processing Notes
Custom cutting of 316L stainless steel 0.005 mm foil can be performed using several laser-based methods. Selection depends on feature geometry, edge quality requirements, and production volume.
Femtosecond Laser Micromachining
Femtosecond laser pulses (pulse duration < 400 fs) remove material via non-thermal ablation. This minimizes heat-affected zone and recast layer, making it suitable for fine features, sharp corners, and applications where edge cleanliness is critical. Typical feature sizes range from 10 µm upward, but feasibility depends on material, thickness, geometry, drawing quality and inspection requirements.
Picosecond Laser Cutting
Picosecond lasers (pulse duration 1–50 ps) offer a balance between processing speed and thermal impact. For 0.005 mm foil, picosecond cutting can produce clean edges with reduced heat-affected zone compared to nanosecond lasers. Suitable for micro hole drilling, slot cutting, and contour cutting of thin parts.
Precision Laser Cutting (Nanosecond Pulsed)
Nanosecond pulsed lasers are faster but generate more heat. They can be used for simple geometries on 0.005 mm foil if edge quality requirements are moderate. A project-specific evaluation is recommended to verify that heat input does not cause distortion or unacceptable edge oxidation.
Micro Hole Drilling and Micro Slot Cutting
Arrays of micro holes (diameters from 20 µm to 200 µm) and narrow slots (widths from 15 µm upward) can be produced in 0.005 mm foil. Taper angle, roundness, and positional accuracy should be specified on the drawing. Feasibility depends on material, thickness, geometry, drawing quality and inspection requirements.
For all laser processing options, the part design should account for the laser beam diameter, focal depth, and any required kerf compensation. A drawing-based quotation with clear acceptance criteria is essential.
Application Scenarios
Below are specific use cases where 316L stainless steel 0.005 mm custom cut foil is commonly specified.
- Fine Metal Mask (FMM) for OLED Deposition: Requires high-aspect-ratio apertures with smooth sidewalls and tight positional accuracy. Femtosecond laser cutting is typically evaluated for this application.
- Shadow Mask for Thin Film Patterning: Used in physical vapor deposition (PVD) processes. Foil flatness and edge cleanliness directly affect pattern resolution.
- Micro Perforated Filter: Used in fluid filtration, gas diffusion, or particle separation. Hole size, spacing, and open area percentage must be specified.
- Precision Shim and Spacer: For gap control in micro-mechanical assemblies. Thickness uniformity and burr-free edges are critical.
- Battery Current Collector Tab: 316L foil is used in some lithium-ion cell designs for corrosion resistance. Laser cutting avoids mechanical stress that could cause cracking.
- EMI Shielding Gasket: Thin foil with micro perforations or slotted patterns can provide electromagnetic interference shielding while allowing airflow.
- Medical R&D Component: Prototype test fixtures, microfluidic devices, or biocompatible sensor substrates often use 0.005 mm 316L foil for its corrosion resistance and non-magnetic properties.
- Scientific Instrument Part: Aperture plates, collimator slits, or electron beam masks in vacuum systems require precise edge definition and low outgassing.
RFQ / Drawing / Document Checklist
To receive an accurate quotation for 316L stainless steel 0.005 mm custom cutting, prepare the following items:
| Item | Details |
|---|---|
| Material Grade | 316L (confirm if low carbon, vacuum melted, or specific ASTM/EN grade is required) |
| Thickness | 0.005 mm (specify tolerance: e.g., ±0.5 µm) |
| Drawing File | DXF, DWG, or STEP format with dimensions, tolerances, and critical-to-function features clearly marked |
| Part Size | Maximum part dimensions (length × width) and quantity per sheet or panel |
| Quantity | Number of parts per order; prototype vs. production volume |
| Surface Requirement | Annealed, bright annealed, or specific Ra value |
| Tolerance Target | Feature size tolerance, positional tolerance, edge condition (burr height, recast layer) |
| Inspection Requirement | Visual, optical measurement, SEM, or coordinate measuring machine (CMM) |
| Requested Documents | MTC, MSDS, TDS, CoA, RoHS, REACH, permeability certificate (if needed) |
| Processing Method Preference | Femtosecond, picosecond, nanosecond laser, or open to recommendation |
Related Resources
For detailed material specifications and processing capabilities, refer to the 316L stainless steel foil material page. Additional technical information is available on the materials overview, femtosecond laser micromachining service, picosecond laser cutting service, precision laser cutting service, micro hole drilling service, and the download center for technical datasheets.
Next Step: Submit a Custom Quote
If your project requires 316L stainless steel foil at 0.005 mm with custom cutting, submit a detailed RFQ through the custom quote page. Include the checklist items above to receive a project-specific evaluation and drawing-based quotation. Finalfoil reviews each request for feasibility based on material, thickness, geometry, drawing quality, and inspection requirements.