304 and 316L are both common stainless steel foil grades, but they are not interchangeable when the foil is only a few microns to tens of microns thick.
Quick Answer
Use 304 stainless steel foil when general corrosion resistance, availability and cost are the main concerns. Use 316L stainless steel foil when the project needs better corrosion resistance, low-carbon weldability or medical and laboratory compatibility.
What Buyers Should Confirm
- Confirm the target thickness, width, length and tolerance before comparing grades.
- Ask whether the project requires SDS, TDS, MTC, RoHS or REACH documentation.
- Review surface condition and temper because ultra-thin foil can be sensitive to handling and forming.
- If the part has micro holes, slots or contours, confirm whether femtosecond laser processing is required.
Processing and Documentation Notes
For early prototypes, buyers often choose the grade that is easiest to source in the required thickness. For final engineering review, corrosion exposure, cleaning method and inspection requirements should drive the decision.
Related Finalfoil Resources
FAQ
Is 316L always better than 304?
No. 316L has stronger corrosion resistance, but 304 can be the better choice when cost, availability and general-purpose use matter more.
Can both grades be laser processed?
Yes. finalfoil can review both grades for femtosecond laser cutting, micro holes, micro slots and prototype components.