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Finding flat stock that holds up in demanding environments — marine hardware, electrical shielding, heat exchangers, or fine craft work — is a challenge for engineers, fabricators, and serious DIYers alike. These cupronickel (copper-nickel alloy) sheets deliver the corrosion resistance and workability that stainless steel can't match in saltwater or humid conditions, and the conductivity that pure copper provides without the softness.
Each sheet is cut from cupronickel alloy flat stock — a copper-nickel blend (typically 70–90% Cu, 10–30% Ni) known for its silvery appearance, moderate hardness, and outstanding resistance to oxidation and biofouling. Available in widths of 100 mm (≈3.94 in) and 150 mm (≈5.91 in), lengths from 100 mm to 300 mm (≈3.94–11.81 in), and thicknesses ranging from 0.2 mm to 3 mm (≈0.008–0.118 in). Sold in packs of 1, 2, 4, 8, or 16 pieces depending on the size selected.
Typical use cases include marine fittings and hull sheathing where biofouling resistance is critical, RF and EMI shielding panels in electronics enclosures, custom gaskets and shims for precision mechanical assemblies, and decorative metalwork or jewelry-making where a silver-toned, tarnish-resistant surface is desired.
| Material | Cupronickel (Copper-Nickel Alloy) |
|---|---|
| Alloy Composition | Typically Cu 70–90% / Ni 10–30% |
| Item Type | Flat Stock Sheet / Plate |
| Width Options | 100 mm (3.94 in) / 150 mm (5.91 in) |
| Length Options | 100 mm / 200 mm / 300 mm (3.94 / 7.87 / 11.81 in) |
| Thickness Range | 0.2 mm – 3 mm (0.008 – 0.118 in) |
| Surface Finish | Mill finish, silver-grey tone |
| Hardness | See variant options |
| Tensile Strength | See variant options |
| Pack Quantity | 1 / 2 / 4 / 8 / 16 pcs (see variant options) |
| Machinability | Good — suitable for cutting, drilling, filing, bending |
| Weldability | TIG/MIG with cupronickel filler rod |
| Solderability | Yes — compatible with silver solder and brazing alloys |
| Corrosion Resistance | Excellent — saltwater, humidity, biofouling resistant |
For flexible shielding, gaskets, or decorative overlays, choose 0.2–0.5 mm — these cut easily with snips. For structural shims, brackets, or heat exchanger plates requiring rigidity, 1–2 mm is a practical range. For load-bearing or wear-resistant applications, 3 mm provides solid stock. Select your size combination from the variant dropdowns above.
No. Cupronickel (copper-nickel) contains only copper and nickel — no zinc. Nickel silver (German silver) is a copper-zinc-nickel alloy. Cupronickel has superior corrosion resistance, especially in marine environments, and better thermal conductivity than nickel silver.
Yes. Cupronickel is one of the most biofouling- and corrosion-resistant metals available for marine use. It is widely used in seawater piping, hull sheathing, and marine heat exchangers. The alloy resists pitting and crevice corrosion that would affect stainless steel in chloride-rich environments.
Sheets 0.2–1 mm thick can be cut with aviation tin snips, a guillotine shear, or a rotary cutter. Thicknesses of 1.5–3 mm are best cut with an angle grinder, jigsaw with a metal blade, or a bandsaw. All thicknesses can be drilled with standard HSS drill bits and filed to shape with a metal file.
Yes. Cupronickel bonds well with silver solder (flux required) and can be brazed using standard copper-phosphorus or silver-based brazing alloys. Clean the surface with fine abrasive paper before joining to ensure a strong, leak-free bond. TIG and MIG welding are also possible using a matching cupronickel filler rod.
Cupronickel is significantly more tarnish-resistant than pure copper or brass. In dry indoor conditions, the surface remains silver-grey for extended periods. In outdoor or marine environments, a light patina may develop over time, which can be removed with a mild metal polish. The alloy does not rust.
The available sizes are listed in the Size (Width × Length × Thick) variant selector above. If you need a size not shown, please use the Contact Us page to describe your requirement — we can advise on the closest available option or discuss custom cutting.
