Application

Stainless steel strip for bipolar plates

Bipolar plates and components for hydrogen.

Typical thicknesses 0.075–0.30 mmTypical widths 150–1250 mmFinishes 2R/BA • 2HAlso on spools

Fuel cells and hydrogen

In fuel cells and electrolysers, thin stainless strip is pressed into bipolar plates that distribute the gases and conduct current. Thin gauges, flatness and a surface suitable for coatings are required.

Bipolar plates are stamped with fine channels and then coated: non-uniform thickness alters channel depth, contact pressure in the stack and coating adhesion. For these applications 3S supplies thin stainless strip from 0.05 mm, with good flatness and tight tolerances to EN or ASTM, verified by 100% dimensional control. The most widely used grades are AISI 316L, 304L and 304; the 2R/BA finish provides a clean, smooth surface suited to subsequent coatings; specific grades can be assessed on request. Widths up to 1250 mm and spools with parallel or traverse winding suit both prototypes and series stamping lines. Every batch is traceable, with a 3.1 certificate on request.

Where it is used

Fuel cells for mobility
Electrolysers for hydrogen production
Energy storage systems

Recommended grades

AISI 316L AISI 304L AISI 304

Supply

Parameter	Range	Notes
Typical grades	AISI 316L, 304L and 304 annealed, 2R/BA finish	Other grades on request
Thickness	Annealed 0.05 – 0.70 mm Work-hardened 0.05 – 2.50 mm	Typical for this application: 0.075 – 0.30 mm
Width	3 – 1250 mm	Typical: 150 – 1250 mm
Finishes	Annealed 2R / BA • Work‑hardened 2H	Calibrated mechanical properties
Formats	Strip • Narrow strips • Spools • Sheets	Sheets cut to size up to 1000 mm
Spools	From 15 kg to 1500 kg	ID 50–400 mm • traverse or parallel winding

Tolerances according to EN ISO 9445 or customer specification. 3.1 certificates on request.

Frequently asked questions

Request a quote

What thicknesses are used for metallic bipolar plates?

Metallic bipolar plates use very thin strip, usually a few tenths of a millimetre or less. We supply thicknesses from 0.05 mm, with tight tolerances and 100% inspection.

Can you supply small quantities for prototypes?

Yes, we also consider limited supplies for trials and prototypes, as strip or sheet, so you can move to series production with the same material.

How can I get a quote?

Tell us the alloy, finish, thickness, width, edge and format (strip/narrow strip/spool) and we will send you a quick quotation.