In high-performance cable manufacturing, combining superior mechanical armoring with reliable moisture and chemical protection is critical for long-term durability in demanding environments. Copolymer Coated Steel Tape (also known as EAA Coated Steel Tape or Copolymer Steel Shielding Tape) is a premium composite material engineered specifically for armoring, shielding, and environmental barrier applications in optical fiber cables, communication cables, shielding cables, and waterproof power cables.
This advanced tape consists of a high-quality low-carbon electrolytic chrome-coated steel (ECCS) base uniformly coated on one or both sides with a specialized ethylene acrylic acid (EAA) copolymer layer. The result is a semi-flexible yet robust armor that delivers exceptional mechanical strength, cathodic corrosion protection, and permanent bonding to common jacketing resins (LDPE, LLDPE, MDPE, HDPE, or zero-halogen compounds) — enabling reliable “bonded jacket” or laminated sheath constructions.
As a specialist B2B supplier of complete cable materials and technical solutions with decades of global project experience, we recognize copolymer coated steel tape as the preferred choice for manufacturers requiring combined armor and moisture barrier performance in outdoor, underground, submarine, and industrial installations.
Composition & Engineered Structure
The tape is built on a precision-engineered base:
- Low-carbon electronic chrome-coated steel (ECCS): Thickness 0.15 mm or 0.20 mm, tempered to T2 condition for optimal formability and fabrication characteristics.
- EAA copolymer coating: Approximately 0.05 mm per side (one or both sides), often color-coded green or white for easy identification during production.
The EAA layer metallurgically bonds to the steel substrate and exhibits excellent chemical compatibility with extruded jackets, forming a permanent, non-delaminating interface during high-speed cabling processes. This structure combines the high tensile strength of steel with the superior adhesion, moisture resistance, and processability of the copolymer.
Key Technical Advantages & Performance Benefits
Robust Mechanical Protection
- Tensile strength: ≥300 MPa (typically 310–420 MPa)
- Elongation at break: ≥20%
These properties provide excellent resistance to crushing, impact, rodent attack, and external pressure while maintaining sufficient flexibility for helical or longitudinal wrapping on high-speed armoring lines.
Superior Moisture & Chemical Barrier
- Peel strength: ≥6.13 N/cm
- Heat seal strength: ≥17.5 N/cm
The EAA copolymer creates a high-integrity waterproof shield that prevents longitudinal and radial water ingress, making it ideal for waterproof and underground cable designs.
Outstanding Corrosion Resistance Achieves Grade 7 performance with no delamination after 168 hours at 68°C in filler/flood or water resistance tests — significantly extending service life in moist, saline, or chemically aggressive environments.
Electrical & Dielectric Integrity Two-side coated versions exhibit no dielectric breakdown at DC 1 kV, preserving full insulation performance across the sheath interface.
High-Speed Processing Compatibility Excellent formability and low bonding temperature simplify longitudinal or helical application, reducing manufacturing defects and improving overall production efficiency.
Primary Applications in Cable Systems
Copolymer Coated Steel Tape is widely specified for:
- Optical Fiber Cables: Primary armoring layer providing rodent protection, crush resistance, and moisture barrier in outdoor, submarine, and direct-buried installations.
- Communication & Shielding Cables: Combined mechanical armor and EMI/RFI shielding in telecommunication and data cables.
- Waterproof Power Cables: Longitudinal or helical wrapping in MV/HV cables requiring integrated armor and environmental protection.
- Specialty Cables: Underground, aerial, and industrial control cables exposed to mechanical stress and harsh conditions.
Its semi-flexible design makes it particularly suitable for fiber optic cables where lightweight yet strong protection is essential.
Copolymer Coated Steel Tape vs. Galvanized Steel Tape – Quick Comparison
| Feature | Copolymer Coated Steel Tape (EAA) | Galvanized Steel Tape (STA) | Best For |
|---|
| Mechanical Protection | Excellent crush & impact resistance | Excellent compression resistance | Fiber optic & communication cables |
| Moisture & Chemical Barrier | Superior (EAA bonded jacket) | Good (zinc sacrificial layer) | Waterproof & underground cables |
| Adhesion to Jacket | Permanent, high peel/heat seal | Moderate (requires additional bonding) | Bonded sheath constructions |
| Corrosion Resistance | Grade 7 (168h test) | Excellent cathodic protection | Long-term buried/saline environments |
| Processing | Superior formability & bonding | Good for helical wrapping | High-speed optical cable lines |
| Typical Applications | Optical fiber, comms, waterproof cables | MV/HV power cables | Hybrid armor + barrier needs |
This comparison highlights why many manufacturers choose copolymer coated steel tape when both mechanical armor and reliable moisture protection are required in a single layer.
Technical Specifications
| Parameter | Typical Value | Test Condition / Standard |
|---|
| Steel Thickness | 0.15 mm or 0.20 mm | Base tape |
| EAA Coating Thickness | ≈0.05 mm | One or both sides |
| Tensile Strength | ≥300 MPa | ISO 527 |
| Elongation at Break | ≥20% | ISO 527 |
| Peel Strength | ≥6.13 N/cm | Internal test |
| Heat Seal Strength | ≥17.5 N/cm | Internal test |
| Corrosion Resistance | Grade 7 | 168 hours at 68°C in filler/flood |
| Dielectric Strength | No breakdown at DC 1 kV | Two-side coated version |
(Custom widths, thicknesses, and coating configurations available to match exact cable designs.)
Manufacturing Standards & Quality Assurance
The product is manufactured in full compliance with the Chinese national standard YD/T 723.3-94 (and updated equivalents) for copolymer coated metal tapes used in communication and power cables. Every batch undergoes rigorous testing for mechanical properties, adhesion, corrosion resistance, and dielectric performance to ensure consistent quality and full traceability.
Packaging & Logistics for Global Supply
Copolymer Coated Steel Tape is supplied in rolls with:
- Inner diameters: 76 mm, 102 mm, 150 mm, 205 mm, or 406 mm
- Widths: 12 mm to 1070 mm
- Outer diameters: Up to 1200 mm
Rolls are securely packed into sturdy wooden cases for maximum protection during sea freight, road transport, and long-term storage.
Reliable Combined Armor & Moisture Barrier for Demanding Cable Applications
Copolymer Coated Steel Tape for Cable Armoring delivers the perfect balance of high mechanical strength, superior moisture and chemical resistance, and excellent processing characteristics. Its EAA copolymer coating ensures permanent bonding and long-term protection, making it the preferred technical solution for optical fiber, communication, shielding, and waterproof cables operating in the harshest environments.
For cable manufacturers and EPC contractors prioritizing reliable quality, customized technical solutions, and long-term infrastructure performance, this material enhances cable durability while streamlining production and reducing overall project costs.
Inquiry Now to request detailed technical data sheets, samples, custom specifications, or competitive bulk quotations tailored to your armoring line and cable designs. Our expert team provides full technical consultation and one-stop material solutions that strengthen your competitive advantage in global cable markets.
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