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Copolymer Coated Copper Tape is a high-performance composite shielding and moisture-barrier material consisting of soft-annealed, high-purity copper tape (typically 0.10–0.20 mm thick) coated on one or both sides with a specialized ethylene acrylic acid (EAA) copolymer layer of approximately 0.05 mm. The coating is commonly color-coded green for visual identification during production. It delivers ≥90% IACS conductivity while forming a permanent moisture-resistant bond to the copper substrate and a strong polymeric bond to polyethylene, chlorinated polyethylene, and low-smoke zero-halogen jackets during extrusion, enabling true bonded-jacket or laminate-sheath cable constructions.

This material is specified primarily for medium- and high-voltage power cables as a combined electrostatic/electromagnetic shield and long-term moisture/chemical barrier around the insulated core. It is also applied in control cables, telecommunication cables, coaxial cables, and certain fiber-optic constructions where reliable water-blocking and corrosion resistance are required under YD/T 723.4-2007 and related ASTM practices.

What Are the Core Technical Parameters of Copolymer Coated Copper Tape?

Typical performance values for commercial grades meeting YD/T 723.4-2007 and ASTM B152 / B736 test methods are as follows:

These values ensure processability on high-speed longitudinal or helical taping lines with minimal deformation and reliable long-term adhesion under wet or chemically aggressive service conditions.

Single-Side vs Double-Side Coating: Selection Logic

Double-side coating is preferred when the cable will be exposed to groundwater, filling compounds, or prolonged immersion because the copolymer layers on both faces create a continuous bonded seal at the overlap and to the outer jacket.

How Does Copolymer Coated Copper Tape Function as Both Shield and Moisture Barrier?

The soft-annealed copper provides continuous metallic coverage for electrostatic screening and a low-impedance path for charging and fault currents. Conductivity ≥90% IACS ensures effective EMI/RFI attenuation and short-circuit capacity.

The EAA copolymer layer simultaneously:

• Forms a moisture-resistant bond that does not delaminate from the copper even after 168 h at 68 °C in water or filler compounds.
• Melts and bonds to the extruded PE, CPE or LSZH jacket at relatively low temperatures, creating a true laminate sheath that prevents longitudinal water migration.
• Offers chemical resistance equivalent to low-density polyethylene while maintaining peel strength ≥5 N/cm after aging.

This dual function eliminates the need for separate metallic tape plus additional water-blocking tapes in many constructions, reducing overall cable diameter and improving mechanical integrity.

Typical Applications and Failure-Mode Prevention

تشمل التطبيقات الرئيسية:

• Medium- and high-voltage power cables (6–36 kV and above) as the metallic screen and radial moisture barrier.
• Underground and direct-buried cables in wet or chemically aggressive soils.
• Control, instrumentation and telecommunication cables requiring high shielding effectiveness and long-term water blocking.
• Certain fiber-optic and hybrid cables where bonded-jacket constructions are specified.

Common failure modes prevented by correct selection and application:

• Delamination of the metal–polymer interface under thermal cycling or exposure to filling compounds.
• Corrosion of bare copper edges leading to progressive shielding degradation.
• Longitudinal water treeing or moisture ingress that reduces insulation life.
• Jacket separation that allows radial water penetration.

Proper overlap (typically 10–25 %), correct heat-seal temperature during jacket extrusion, and verification of peel strength after production are essential process controls.

Industry Standards and Market Context

The governing Chinese standard is YD/T 723.4-2007 (Laminated Metal Plastic Strip for Communication Cable and Optical Fibre Cable – Part 4: Laminated Copper Plastic Strip). Performance is also aligned with ASTM B152 (copper strip), ASTM B736 (peel and heat-seal testing), and relevant sections of IEC 60502 for power cables.

Global market data indicate the copolymer-coated copper tape segment was valued at approximately USD 266 million in 2025 and is projected to reach USD 363 million by 2032 at a CAGR of 4.6 %, driven by demand for high-reliability MV/HV power infrastructure, renewable energy interconnections, and upgraded telecommunication networks.

Key Selection and Quality Points for Procurement Engineers

1. Confirm copper purity and annealing condition to guarantee ≥90% IACS and formability.
2. Verify single- or double-side coating and green color coding for process identification.
3. Require full test reports covering peel strength, heat-seal strength, corrosion grade 7, and 168 h water/filler resistance.
4. Specify core material (paper, steel or plastic), inner diameter (76 / 150 / 406 mm common), and joint-free length to match production line requirements.
5. Request samples for in-house adhesion and dielectric verification before bulk order.

Copolymer coated copper tape remains the preferred solution when both high conductivity shielding and permanent moisture sealing are mandatory for reliable long-term cable performance.

استفسر الآن for custom widths, thicknesses, single- or double-side configurations, and technical data sheets tailored to your cable design. Our engineering team provides material selection support and process recommendations based on IEC, GB and ASTM requirements to ensure consistent quality and long-term cooperation.