Copolymer coated aluminium tape (also known as EAA-coated aluminium tape or Alu/Copoly tape) is a composite metallic barrier consisting of high-purity soft aluminium foil laminated or coated on one or both sides with an adherent ethylene acrylic acid (EAA) copolymer film. It simultaneously provides electromagnetic shielding, longitudinal and radial moisture blocking, and chemical resistance while forming a permanent heat-seal bond to polyethylene (PE), LLDPE, MDPE and HDPE jackets during cable extrusion.
High-quality copolymer coated aluminium tape rolls ready for cable manufacturing — available in various widths and core diameters.
What is Copolymer Coated Aluminium Tape and Why is it Preferred Over Bare Aluminium Tape?
Copolymer coated aluminium tape is a dual-function barrier material in which soft-temper aluminium foil (typically 0.08–0.50 mm thick, alloys 1050, 1145, 1200 or 8011) is coated with 0.03–0.10 mm of EAA copolymer on one or both faces. The aluminium layer delivers high electrical conductivity for EMI/RFI shielding and acts as a continuous metallic moisture barrier. The EAA layer supplies peel strength ≥ 6.13 N/cm and heat-seal strength ≥ 17.5 N/cm, enabling a bonded “laminate sheath” that prevents water ingress and delamination under long-term exposure to filling compounds or ground water. Bare aluminium tape lacks this adhesion and is prone to edge corrosion and jacket separation; the copolymer coating eliminates those failure modes while remaining compatible with standard PE extrusion processes.
How Does the EAA Copolymer Layer Create a Reliable Moisture Barrier and Bonded Jacket?
The ethylene acrylic acid copolymer melts in the temperature window of PE jacket extrusion (approximately 160–220 °C) and forms covalent and hydrogen bonds with both the aluminium surface and the polar groups of the PE sheath. Once cooled, the interface develops peel strength that remains ≥ 6.13 N/cm even after 168 h immersion in water or commercial cable filling compounds at 68 ± 1 °C (tested to YD/T 723-2007 / ASTM B736). This creates a continuous, non-delaminating radial and longitudinal water barrier. Double-sided coating further seals the overlapping edges of the tape, reducing the risk of water tracking along the aluminium surface. Corrosion resistance reaches grade 7 after 480 h exposure to 0.1 mol/L HCl or NaOH, confirming long-term integrity in buried or submarine environments.
التطبيقات الأساسية في تصنيع الكابلات
Copolymer coated aluminum tape is widely used across multiple cable types:
- كابلات الاتصالات والبيانات — Provides effective EMI shielding and moisture protection in copper pair, coaxial, and data transmission cables.
- Fiber Optic Cables — Serves as a metallic moisture barrier and shielding layer in underground, aerial, and submarine optical cables.
- Power Cables — Used as composite shielding and waterproofing in medium- and high-voltage power cables, especially in harsh or buried environments.
- كابلات متخصصة — Applied in cables requiring combined electrical shielding and environmental protection, such as those used in renewable energy, industrial, and infrastructure projects.
Its ability to bond reliably with common cable sheath materials (LLDPE, MDPE, HDPE) makes it particularly valuable for high-performance, long-life cable constructions.
المزايا الرئيسية
- Excellent EMI/RFI Shielding — High-conductivity aluminum layer provides effective electromagnetic interference protection.
- Superior Moisture Barrier — EAA copolymer creates a strong, sealed barrier against water, flooding compounds, and humidity, significantly reducing corrosion and signal degradation risks.
- Strong Adhesion & Sealability — High peel strength (≥6.13 N/cm) and heat-seal performance (≥17.5 N/cm) ensure reliable bonding during extrusion and prevent delamination throughout the cable’s service life.
- Good Mechanical Properties — Tensile strength ≥65 MPa and elongation ≥15% provide durability during high-speed processing, handling, and installation.
- Corrosion & Environmental Resistance — Grade 7 corrosion resistance, proven performance after prolonged exposure to water and filling compounds.
- Flexible Processing — Wide range of widths (typically 12–1070 mm) and core diameters; available in single-sided or double-sided configurations and clear or blue coating colors.
المواصفات الفنية
| المعلمة | القيمة النموذجية | Test Method / Standard |
|---|
| Aluminium thickness | 0.08–0.50 mm | Micrometer |
| EAA coating thickness (per side) | 0.03–0.10 mm | Micrometer |
| Tensile strength | ≥ 65–75 MPa | ASTM E8 / YD/T 723-2007 |
| Elongation at break | ≥ 15–25 % | ASTM E8 / YD/T 723-2007 |
| Peel strength (coating to Al) | ≥ 6.13 N/cm | ASTM B736 |
| Heat-seal strength | ≥ 17.5 N/cm | ASTM B736 |
| Water / filler resistance (68 °C, 168 h) | No delamination, peel ≥ 6.13 N/cm | REA PE-39 / PE-89 / ASTM B736 |
| Dielectric strength (double-sided) | No breakdown at DC 2 kV / 1 min | GB/T 1408 |
| Corrosion resistance | Grade ≥ 7 | 0.1 mol/L acid/alkali, 480 h |
These values are routinely achieved with aluminium alloys in the soft (O) temper to ensure formability during longitudinal or helical application on cable lines.
Single-Sided vs Double-Sided Copolymer Coated Aluminium Tape – Selection Logic
| ميزة | Single-Sided | Double-Sided |
|---|
| Structure | EAA / Al or Al / EAA | EAA / Al / EAA |
| Primary use | Cost-sensitive telecom & low-voltage power | Fibre-optic, medium/high-voltage, submarine |
| Edge sealing | Requires additional overlap adhesive or filler | Self-sealing overlap |
| Moisture barrier effectiveness | عالي | Highest |
| Heat-seal to PE jacket | One face only | Both faces |
| Typical aluminium gauges | 0.10–0.30 mm | 0.15–0.25 mm |
| Dielectric strength | DC 1 kV | DC 2 kV |
| Relative cost | أدنى | أعلى |
Double-sided tape is specified when the cable design demands a fully bonded sheath and maximum resistance to longitudinal water migration. Single-sided tape is selected when only one face needs to bond to the outer PE jacket and cost optimisation is required.
التطبيقات الأساسية في تصنيع الكابلات
Copolymer Coated Aluminium Tape is widely used across high-reliability cable types:
- كابلات الاتصالات والبيانات — Effective EMI shielding and moisture protection in copper pair, coaxial, and data transmission cables.
- Fiber Optic Cables — Metallic moisture barrier and shielding layer for underground, aerial, and submarine optical cables.
- Power Cables — Composite shielding and waterproofing in medium- and high-voltage power cables, especially in harsh or buried environments.
- كابلات متخصصة — Renewable energy, industrial, and infrastructure projects requiring combined electrical shielding and environmental protection.
Its reliable bonding with common sheath materials makes it particularly valuable for long-life, high-performance cable constructions.
Manufacturing Standards & Quality
RLB Copolymer Coated Aluminium Tape is manufactured under strict quality control to ensure consistent coating thickness, adhesion performance, and cleanliness — critical for high-speed cable production lines.
يتوافق المنتج مع المعايير الوطنية الصينية YD/T 723-2007 for copolymer coated aluminum tape used in communication cables and is suitable for cables produced under major international standards.
Manufacturing Process Highlights:
- EAA copolymer film is produced via mono-extrusion.
- Film is heat-laminated onto high-purity aluminum foil in a controlled tunnel oven for strong, uniform bonding.
- Final slitting and packaging according to customer specifications.
Packaging & Supply
Supplied in rolls with inner core diameters of 76 mm, 102 mm, 150 mm, 205 mm, or 406 mm (steel, aluminum, or plastic cores). Maximum outer diameter up to 1200 mm. Rolls are securely packed in sturdy wooden cases for safe international transportation and storage.
Why Cable Manufacturers Choose RLB Copolymer Coated Aluminium Tape
When integrated with RLB’s complete cable manufacturing solutions — including high-speed stranding equipment, extrusion lines, and complementary shielding materials — this tape delivers a reliable, cost-effective component that enhances both electrical performance and environmental durability of finished cables.
Its combination of shielding effectiveness, strong adhesion, and proven moisture resistance makes it the preferred choice for manufacturers producing high-reliability communication, fiber optic, and power cables for demanding global markets.
Key Technical Takeaways
Copolymer coated aluminium tape remains the most cost-effective solution that simultaneously delivers metallic shielding, absolute moisture barrier performance and a permanent bond to PE jackets. Correct selection of aluminium gauge, single- versus double-sided coating, and verification of peel/heat-seal strength after accelerated ageing are the decisive factors for cable longevity. When specified and applied according to YD/T 723-2007 and ASTM B736 criteria, the material provides decades of reliable service in the most demanding buried and submarine environments.
For project-specific thickness combinations, alloy selection, width and packaging requirements, or to request test certificates and samples,
استفسر الآن.
Copolymer Coated Aluminium Tape – Doing Cable Material
Copolymer Coated Aluminium Tape (EAA coated) for cable manufacturers. Single/double sided, 0.08–0.50 mm Al thickness, excellent peel & heat seal strength. YD/T 723-2007 compliant. Custom widths available. Inquiry Now for reliable cable shielding solutions.
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