High Purity Silver Wire Ag99.99% Electrochemical Conductive Metal Wire 0.025-2mm

Ag99.99% (4N grade) means the wire is 99.99% silver by mass, with total impurities below 100 ppm. In electrochemical applications, even small amounts of copper, iron, or other metals shift the electrode potential away from the theoretical silver value (+0.80 V vs. SHE), introduce galvanic noise, and can contaminate your electrolyte. 4N purity ensures reproducible, stable electrode behavior across experiments.

For most bench-scale reference electrodes, Ø0.5 mm to Ø1 mm is the practical range — thick enough to handle without kinking, thin enough to fit standard glass capillary housings. If you are building a micro-reference for scanning electrochemical microscopy (SECM), Ø0.025–0.1 mm filaments are appropriate. Select the 1 m length for a single electrode; the 5 m option is economical if you are fabricating multiple electrodes in a batch.

Yes. Bare Ag99.99% wire solders readily. Use a silver-bearing solder such as Sn96Ag4 or a eutectic Sn63Pb37 with a mildly activated rosin flux (RMA type). Avoid aggressive acid fluxes, which can etch the silver surface. For no-heat bonding, a two-part conductive silver epoxy (e.g., MG Chemicals 8331) also bonds well to the bare silver surface.

Silver tarnishes (forms Ag₂S) when exposed to sulfur-containing compounds in air over time. The thin tarnish layer has higher resistivity than pure silver, which can matter for low-current sensor contacts. For electrochemical use, lightly abrade or electrochemically reduce the surface before use. For jewelry, tarnish is a cosmetic issue only and does not affect structural integrity. Store unused wire in a sealed, low-humidity bag to slow tarnishing.

Yes, with a caveat on work-hardening. Fine silver (Ag99.99%) is softer and more ductile than sterling silver (Ag92.5%), which makes it easier to form tight wraps and coils without cracking, but it also means it work-hardens more slowly and may feel slightly less springy. Diameters of Ø0.2–0.5 mm are popular for wire wrapping; Ø1–2 mm is used for structural frames and bangles. Anneal by heating to a dull red and quenching in water if the wire becomes stiff during extended forming.

The 20 cm option is designed for larger-diameter wire (Ø1–2 mm) where a short, rigid segment is all that is needed for a heating element or structural component. The 1 m and 2 m lengths suit most bench electrochemistry and jewelry projects. The 5 m option is the most cost-effective per meter for thinner diameters (Ø0.025–0.9 mm) and is ideal if you are winding coils, making multiple electrodes, or running extended conductive traces.

Silver wire can function as a low-temperature resistance heater up to approximately 700–800 °C in inert or reducing atmospheres. Above that range, silver oxidizes and its mechanical strength drops sharply. For furnace elements operating above 900 °C, platinum or Kanthal wire is more appropriate. For lower-temperature applications such as sample stage heaters or micro-hotplates, Ø0.5–1 mm silver wire is a viable and highly conductive option.