شريط الألمنيوم المغطى بالبوليمر

شريط ألومنيوم مطلي بالبوليمر المشترك (Alu/Copoly or EAA-Coated Aluminium Tape) is a dual-function metallic barrier material consisting of soft-temper high-purity aluminium foil coated on one or both sides with ethylene acrylic acid (EAA) copolymer. It simultaneously provides electromagnetic shielding, radial and longitudinal moisture barrier performance, and a heat-seal bond to polyethylene jackets, forming a reliable laminate sheath in modern cable constructions.

المزايا التقنية الرئيسية

• High electrical conductivity for effective EMI/RFI shielding
• Continuous radial and longitudinal moisture barrier
• Peel strength ≥ 6.13 N/cm and heat-seal strength ≥ 17.5 N/cm (ASTM B736)
• Excellent resistance to cable filling compounds and flooding compounds (no delamination after 168 h at 68 °C)
• Corrosion resistance Grade ≥ 7 after 480 h exposure to 0.1 mol/L acid or alkali
• Soft temper aluminium ensures good formability for longitudinal or helical application
• Available in natural (silver) or blue colour for easy identification
• Compatible with high-speed cable manufacturing lines

Material Structure and Function

The aluminium substrate is typically soft (O-temper) alloys 1050, 1145, 1200 or 8011, thickness range 0.08–0.50 mm. Each face is coated with 0.03–0.10 mm of EAA copolymer (natural or blue).

During PE jacket extrusion (approximately 160–220 °C) the copolymer melts and forms covalent/hydrogen bonds with both the aluminium surface and the polar groups of LDPE, LLDPE, MDPE or HDPE. After cooling, the interface develops peel strength ≥ 6.13 N/cm and heat-seal strength ≥ 17.5 N/cm. This creates a continuous, non-delaminating bonded sheath that prevents longitudinal water migration and edge corrosion—failure modes common with bare aluminium tape.

Key Technical Parameters

Data aligned with YD/T 723-2007, ASTM B736, ASTM E8 and manufacturer specifications :

Single-Sided vs Double-Sided Selection Logic

Double-sided tape is preferred when the design demands a fully bonded sheath and maximum resistance to longitudinal water tracking. Single-sided tape is selected when only one face needs to bond to the outer jacket and cost optimisation is required.

Applications in Cable Construction

• Fibre-optic cables (underground, aerial, submarine): metallic moisture barrier + shielding.
• Telecommunication and copper-pair cables: EMI/RFI shielding and group separation.
• Medium- and high-voltage power cables: composite moisture barrier under the outer sheath (especially buried or wet environments).
• Control and instrumentation cables requiring long-term corrosion resistance.
• Marine and offshore constructions where salt-water exposure and filler compounds demand high peel and heat-seal performance.

Performance Advantages over Bare Aluminium Tape

Bare aluminium lacks adhesion to the PE jacket, leading to edge corrosion, delamination under filling compounds, and water tracking along the metal surface. The EAA coating eliminates these failure modes while remaining fully compatible with standard PE extrusion lines. Corrosion resistance reaches grade ≥ 7 after 480 h acid/alkali exposure, and water/filler immersion at 68 °C for 168 h retains full peel strength.

Processing and Quality Notes

• Soft temper ensures formability for longitudinal or helical application at high line speeds.
• Widths from 12 mm upward; standard cores 76 mm, 102 mm, 152 mm or 406 mm; lengths typically 1 000–4 400 m without joints.
• Surface must be free of pinholes, creases, oil and moisture.
• Storage: clean, dry warehouse; avoid direct sunlight and mechanical damage.

Key Technical Takeaways

• Copolymer coated aluminium tape combines metallic conductivity/shielding with a heat-sealable polymer interface that forms a permanent laminate sheath.
• Minimum peel strength of 6.13 N/cm and heat-seal strength of 17.5 N/cm after water/filler ageing are the critical acceptance criteria for long-term moisture barrier integrity.
• Correct choice of single- versus double-sided coating and aluminium gauge directly determines edge sealing performance and final cable reliability in wet or buried environments.
• Consistent coating thickness, adhesion and surface cleanliness are essential for high-speed cable production and compliance with YD/T 723 and related international specifications.

For detailed technical data sheets, custom aluminium thickness and coating configurations, or joint development of moisture-barrier cable designs,

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