Stock code: 601677
Stock code: 601677
In cable construction, the shielding layer plays a critical role in resisting electromagnetic interference and preserving signal purity. Choosing the right aluminum coil for cable shielding is not just a purchasing step—it is an upfront investment in the final reliability of your product. Whether you produce communication cables, power cables, or specialty wiring, the match of the aluminum foil shielding layer directly affects end‑use performance. Let’s break down the key points from material fundamentals to application scenarios.
Aluminum is widely adopted in the global cable industry for good reasons:
– It is light – about one‑third the density of copper, which significantly reduces cable weight.
– It offers excellent conductivity and reflects electromagnetic waves effectively.
– Its natural oxide layer provides long‑term corrosion resistance without extra treatment.
– It is cost‑stable and more affordable than copper, helping to manage material costs without sacrificing performance.
In high‑speed wrapping and longitudinal lapping processes, aluminum foil shows excellent bendability and conformability, which reduces waste and keeps production lines running smoothly.
Before placing an order, focus on these three material attributes:
Alloy grade – The most common choices are 1235, 1060, and 8011.
– 1235: high purity, top conductivity – ideal for RF and high‑frequency communication cables.
– 1060: balanced properties and cost – suitable for general power cables.
– 8011: higher strength and better lamination stability – often used for water‑blocking tapes or fire‑resistant layers.
Thickness – Thickness determines shielding efficiency and mechanical strength. Typical ranges:
– 0.05–0.10 mm: for communication cable wrapping
– 0.10–0.20 mm: for power cable shielding layers
– 0.20–0.50 mm: for armouring or water‑blocking substrates
Consistency in thickness is more important than the nominal value itself. Large deviations can cause loose or uneven wrapping.
Temper – For high‑speed continuous wrapping, O‑temper (soft annealed) foil offers the best flexibility. For lamination applications, either O‑temper or H‑temper (half‑hard) can be used depending on the process.
> *The above are all base‑material considerations. We do not perform surface treatment or secondary processing on the coils – all products are delivered as high‑quality bare foil.*
Bare aluminum foil is often laminated with a polymer film to improve tensile strength and durability. Two common options are:
– AL/PET (aluminium + polyester) – The PET backing gives high tensile strength and a wide temperature range (–40°C to +130°C). It resists wrinkling during wrapping and ensures consistent shielding coverage. Recommended for high‑frequency data cables, 5G feeder lines, and data‑centre high‑speed interconnects.
– AL/PE (aluminium + polyethylene) – Softer and more flexible, suitable for large‑diameter harnesses and repeated bending. The PE side can be heat‑sealed to provide moisture‑proof sealing at cable ends. Often used in automotive low‑voltage wiring, household appliance leads, and applications that require frequent flexing.
Choose the laminate layer based on the cable’s operating environment rather than on price alone.
Different cables demand different foil performance. Here is a practical reference:
– Coaxial cables / Cat5e–Cat7 – Single‑side AL+PET tape, aluminium layer 7–9 μm; focus on surface resistance and overlap rate.
– Cat6A / Cat7A / Cat8 high‑speed cables – Conductive‑adhesive AL+PET, requiring 100% overlap and adequate peel strength.
– Multi‑core control cables – Double‑side laminated tape, aluminium layer 12–25 μm; pay attention to tensile strength in both directions.
– 5G feeders and RF antennas – Precision‑slit thin foil (7–9 μm) with width tolerance within ±0.2 mm.
– Robot drag‑chain cables – Reinforced AL+PET with a fabric mesh, thickness 18–25 μm, to withstand millions of flex cycles.
– Tracing or heating cables – AL+PET with cross‑linked PE backing, capable of continuous operation at ≥120°C.
– Automotive wiring harnesses – Heat‑resistant adhesive AL+PET (12–18 μm) that endures 125°C continuous heat and oil exposure.
When sourcing aluminum coil for cable shielding, pay close attention to these three practical factors:
– Surface cleanliness – The foil should be free from oil stains, oxidation marks, or scratches. Any defects here will weaken lamination adhesion and compromise shielding continuity.
– Thickness uniformity – Batch‑to‑batch variation should stay within ±0.5 μm. Stable thickness ensures consistent shielding performance and is more valuable than a single high‑precision batch.
– Mechanical strength and coil length – Tensile strength typically needs to reach 70–80 MPa or above for most cable applications. Long‑length coils reduce splice frequency and improve production efficiency.
In practice, the selection process is never about a single parameter – it is about matching alloy, thickness, composite structure, and application scenario together. A well‑matched foil not only enhances shielding effectiveness and mechanical durability but also keeps your overall cost structure in check. Mingtai Aluminum supplies 1235, 8011 and other mainstream alloys for cable shielding, with stable thickness tolerances and reliable delivery. Feel free to reach out for more detailed information.
Q: Which alloys are most common for cable shielding foil?
A: 1235, 1060, and 8011 are the top three, chosen for conductivity, balance, or strength depending on the use.
Q: What is the main difference between AL/PET and AL/PE?
A: AL/PET is stiffer and heat‑resistant, best for high‑frequency cables; AL/PE is more flexible and heat‑sealable, ideal for bending and moisture sealing.
Q: Does thickness tolerance really affect shielding performance?
A: Yes, uneven thickness leads to loose wrapping and signal attenuation; keep variation within ±5% or ±0.5 μm.
Q: Which temper suits which process?
A: O‑temper is soft and best for high‑speed wrapping; H‑temper is semi‑hard and often used for lamination.
Q: What physical property should I check first when ordering?
A: Surface quality and thickness consistency matter most – they directly determine lamination strength and shielding continuity.
