This 0.7mm Bare Copper Wire is a solid, uninsulated single-strand copper wire wound into a convenient 10-meter roll. Lacking any enamel, plastic, or varnish coating, this wire features a fully exposed, highly conductive surface. It is an essential material used across electrical grounding, custom antenna fabrication, jewelry making, and scientific prototyping.

Specifications

• Material: >99.9% Pure Copper (Cu)
• Wire Diameter: 0.7mm
• American Wire Gauge (AWG): Approximately 21 AWG
• Length: 10 Meters (Full Roll)
• Insulation: None (Bare / Uninsulated)
• Conductor Type: Solid Core (Single Strand)
• Temper: Half-Hard / Medium-Soft (Highly malleable yet holds its shape structurally)

Common Applications

• Electrical Grounding & Bussing: Creating common ground rails or jumper buses across a circuit board where components need to tie into a shared terminal trace.
• Inductors and RF Antennas: Winding custom air-core inductors, chokes, or rigid helical antennas for radio frequency (RF) and ham radio experimentation.
• Scientific and Educational Experiments: Demonstrating electromagnetic principles, such as winding coils for DIY electromagnets, simple electric motors (homopolar motors), or Faraday's law experiments.
• Artistic Wire Wrapping & Jewelry: Crafting armature structures, wire-wrapped jewelry, rings, and conceptual models due to its beautiful natural metallic finish.

Usage and Maintenance Tips

• Short-Circuit Prevention: Because this wire is completely bare, running parallel strands close together can easily cause an electrical short circuit if they touch. For compact transformer or motor windings, use enameled magnet wire instead. If using this bare wire, slip silicone or heat-shrink tubing over sections that run risk of overlapping.
• Oxidation and Patina: Over time, raw copper naturally reacts with oxygen and moisture in the air, developing a dark brown or green protective oxide layer (patina). While this doesn't affect internal conductivity, it can hinder surface contact. Wipe older wire down with a mild abrasive (like steel wool or fine sandpaper) right before soldering to ensure a pristine bond.
• Current Limits: As a general rule for enclosed spaces or continuous chassis wiring, 21 AWG solid copper wire is safely rated for up to 1.5A to 2A AC/DC without experiencing noticeable resistive heating.
• Tangle-Free Unrolling: When cutting lengths from the 10-meter roll, keep the main coil secured with a twist-tie or tape. Solid core wire can easily spring outward and form knots if the entire bundle is allowed to loosen at once.