Technical Specifications

• Type: Flattened Expanded Copper Mesh
• Material: 99.99% O-free pure copper
• Raw Copper thickness: 2 mm
• Mesh dimensions: LWD: 50mm, SWD: 25mm
• Strand width: 2.5mm
• Sheet thickness: 2mm
• Sheet dimension: 1x2m 1x1m 2x3m 2x4m or as request

1 Extremely Low Inductance (The Primary Goal)

• Expanded mesh behaves as a continuous conductive plane for high‑frequency currents (lightning, 1 MHz – 10 MHz).

• The diamond geometry provides multiple, short parallel paths – lower loop inductance than welded rectangular mesh.

• Typical inductance: For a 1 m × 1 m expanded sheet, inductance can be < 0.2 μH (vs. 0.5 μH for welded mesh, vs. 10 μH for a single 10 m rod).

2 Improved Skin Effect Utilization

• Impulse currents travel on the surface (skin depth in copper at 1 MHz ~ 0.066 mm).

• Expanded mesh has high surface area per unit mass because the strands are thin and have exposed edges from the stretching process.

• For the same copper weight, expanded mesh can carry more impulse current than solid strip or round wire.

3 No Welded Joint Weak Points

• In woven/welded mesh, the intersections are potential failure points under high di/dt (localised heating, arcing).

• Expanded mesh has integral nodes – no dissimilar metals, no heat‑affected zones. It can withstand repeated lightning strikes without degradation.

4 Flexibility & Conformability

• Expanded mesh rolls easily and conforms to uneven soil, trenches, or building foundations.

• It can be cut with tin snips and lapped without requiring special tools.

5 Corrosion Behaviour

• Bare expanded copper is suitable for most soils (pH 5–8).

• For aggressive soils, tinned expanded copper is used. Tinning does not harm impulse performance because skin effect at lightning frequencies keeps current in the outer tin layer (which is also a good conductor).

1. Power system (core use):

Grounding devices for large power plants, substations, high-voltage transmission lines, converter stations (ultra-high voltage direct current)

2. Lightning protection and weak current system:

communication base stations (especially mountaintops and unmanned stations), data centers, precision electronic equipment rooms, radar stations, broadcasting transmission towers

More information request, please contact us via sandy@aegismetals.net