CUPAL Strips

Copper-aluminium bimetal strips for lightning protection and cable-lug joints — standard 500 × 40 × 0.5 mm, custom widths on a 24 h quote.

CUPAL Strips

In short

CUPAL strip is a pre-cut copper-aluminium bimetal strip for lightning-protection transitions and cable-lug joints. It mates the aluminium down-conductor to aluminium and the copper earth to copper, so the copper-aluminium transition stays durable and free of galvanic corrosion.

500 × 40 × 0.5mm
Standard strip size
40–150mm
Custom width
0.3–2.0mm
Custom thickness
70–110N/cm
Al–Cu bond strength

What is CUPAL strip used for?

In lightning protection systems and cable lug connections, the copper-aluminium transition is a corrosion-sensitive point. CUPAL strip provides a lasting, corrosion-free transition.

CUPAL strip is a pre-dimensioned bimetal piece that you wrap around a cable lug connection. This solves the transition between an aluminium down-conductor and a copper earth in a corrosion-free way. Catalogues and enquiries list the same part as bimetal strip, bimetallic strip or simply Cu-Al strip. The name on the drawing does not decide anything — the width and the thickness do. Mainly used in lightning protection and high-voltage transition connections.

Standard size

This size ships ex stock; other widths and thicknesses are made to order with a 5–10 day production time.

Length500 mm
Width40 mm
Thickness0.5 mm

Typical applications

  • Wrapping lightning protection connections (copper-aluminium-steel transition)
  • Corrosion prevention on cable lug connections in outdoor environments
  • Transition elements in power distribution systems
  • Flexible busbar transitions where the joint must absorb thermal expansion or vibration

The standard 500 × 40 × 0.5 mm strip is ex stock. Custom widths 40–150 mm and thicknesses 0.3–2.0 mm are made to order, 5–10 day production. There is no list price for strip: send the width, thickness and quantity, and we quote within 24 h, with a discount on volume.

Also available in custom widths and thicknesses — tell us what you need, we cut it.

Send a drawing for custom cutting →

Frequently asked questions about CUPAL strip

The standard CUPAL strip is 500 × 40 × 0.5 mm and ships ex stock. Custom widths run 40–150 mm and thicknesses 0.3–2.0 mm, made to order with a 5–10 day production time.
In an electrical catalogue, yes — bimetal strip, bimetallic strip and Cu-Al strip all name the cold-roll-bonded copper-aluminium material we supply as CUPAL. In an instrument catalogue the same words mean thermostatic bimetal, which works from the differing thermal expansion of two metals and bends when heated; that is a different product. What matters on an order is the width and the thickness: send us those two and we confirm whether the stock 500 × 40 × 0.5 mm strip fits or the strip has to be made.
As a flexible copper-aluminium transition between busbars and conductors where the joint must also absorb thermal expansion or vibration — without galvanic corrosion.
Yes. CUPAL withstands a wide range of cold-forming operations (bending, edge-bending) without layer separation, within the 260 °C / 4 h heat-treatment limit.
Yes. Send the drawing (DXF, PDF or JPG) and we cut the CUPAL strip to the size you need.
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Custom-cut to any shape — no one else offers this

Circles, strips, rectangles or fully bespoke contours — we cut any shape from CUPAL sheet. Send your drawing or describe the dimensions, and we respond within 1 business day.

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