Copper Polyester Tape (CU/PET Tape / Copper Mylar Tape) is the preferred composite shielding material for modern cable manufacturing. As a cable-grade EMI shielding laminate, it combines high-conductivity copper foil and high-toughness PET polyester film via stable composite lamination. For cable factories, this material solves core production and product pain points including insufficient shielding performance of aluminum polyester tape, easy oxidation of pure copper foil, and poor mechanical durability of traditional shielding layers. It is widely applied for mass production of data cables, communication cables, control cables, coaxial cables and instrumentation cables, balancing stable electrical performance, high-speed processability and long-term cable service reliability.
Tailored for cable wrapping and extrusion processes, the CU/PET composite structure avoids common production defects such as delamination, foil breakage and insulation failure during high-speed cabling:
- Copper Foil Conductive Layer: Adopts annealed electrolytic copper or rolled copper with ultra-low resistivity. Compared with aluminum-based shielding tape, it provides far higher EMI/RFI shielding efficiency and stable grounding conductivity. It effectively suppresses low-to-medium frequency electromagnetic crosstalk and external interference, ensuring excellent signal integrity for finished cables, which is critical for high-grade communication and industrial control cable certification.
- PET Polyester Insulation Base Layer: Acts as the core mechanical and insulating support for cable shielding layers. It delivers high tensile strength, tear resistance and bending durability, preventing copper foil fracture during high-speed spiral wrapping and longitudinal wrapping processes. Meanwhile, the PET layer provides reliable inter-layer insulation to avoid short-circuit risks inside multi-layer shielded cables.
- High-Adhesion Composite Adhesive: Cable-specific high-temperature resistant adhesive ensures zero delamination between copper and PET layers during cable extrusion, vulcanization and long-term bending service. Low surface oxygen formula enables tight fitting with cable core insulation and outer sheath materials (PVC, PE, LSZH), reducing defective rates caused by poor fitting.
Two mainstream factory specifications are available: single-sided copper (CU+PET) for standard civil cables and double-sided copper (CU+PET+CU) for high-shielding industrial and communication cables, supporting differentiated product line layout.
- Higher Cable Grade & Certification Pass Rate: Shielding efficiency exceeds 95% for conventional frequency bands, fully meeting EMI compliance requirements for network cables, industrial control cables and automotive wiring harnesses. It helps finished cables pass CE, FCC and industrial EMC tests easily, improving product competitiveness.
- Excellent Process Adaptability for Mass Production: Uniform thickness and stable flexibility adapt to high-speed automatic wrapping machines, avoiding material jamming, foil cracking and uneven overlapping during continuous cabling. It supports both longitudinal wrapping and spiral wrapping processes, suitable for diversified cable production lines.
- Low Defect Rate & Reduced Production Cost: The PET reinforcement layer solves the oxidation and fragility problems of pure copper tape. It features strong bending resistance and no layer separation, significantly reducing post-production defective products and after-sales quality issues caused by shielding layer failure.
- Wide Environmental Adaptability for Finished Cables: The finished shielded cable maintains stable performance at -40℃ to 120℃, with excellent aging resistance and oxidation resistance. It guarantees long-term stable operation of outdoor communication cables, industrial equipment cables and new energy wiring harnesses, extending cable service life.
- Good Compatibility with Cable Sheath Materials: Optimized surface adhesion matches mainstream cable insulation and sheath materials including PE, PVC and halogen-free flame-retardant materials, ensuring tight integration between shielding layer and cable structure without gaps or bulges.
- Single-sided Copper Polyester Tape: Cost-effective for mass production of conventional LAN cables, household control cables, ordinary signal cables and low-voltage cables. It balances basic shielding performance and production cost, suitable for civilian standard cable batches.
- Double-sided Copper Polyester Tape: Preferred for high-end customized cables, including precision instrument cables, coaxial communication cables, industrial anti-interference control cables and new energy vehicle wiring harnesses. Double-sided conductive and double-sided shielding structure meets strict anti-crosstalk and high-stability signal transmission requirements.
- Self-adhesive Copper Polyester Tape: Designed for special-shaped cable cores and small-batch customized cables. The adhesive-backed design simplifies manual and semi-automatic fitting processes, improving construction efficiency for special cable specifications.
The following industrial standard parameters are tailored for cable batch production, with customizable thickness, width and structure to match different cable AWG sizes and shielding grades:
- Layer Thickness: Copper foil 4μm–35μm (adjustable per shielding grade); PET film 1.6μm–23μm (adjustable per mechanical strength demand)
- Slitting Width: 0.5mm–990mm, precise custom slitting to avoid material waste and ensure wrapping uniformity
- Tensile Strength: ≥30MPa, adapts to high-speed automatic cabling equipment
- Elongation at Break: ≥30%, prevents cracking during cable bending and coiling
- Shielding Efficiency: ≥95% (low & medium frequency), meets mainstream cable EMC standards
- Continuous Working Temperature: -40℃ to 120℃, compatible with cable high-temperature extrusion and long-term service
- Production Quality Standard: Uniform thickness, no bubbles, no delamination, no surface scratches, zero foreign particles to ensure cable yield rate
As a dedicated shielding material for the cable industry, copper polyester tape covers all mainstream high-value cable production scenarios:
- Communication & Data Cables: Core shielding layer for network LAN cables, broadband data cables and coaxial cables, eliminating signal attenuation and crosstalk to ensure high-speed and stable data transmission.
- Industrial Control Cables: Applied to automation equipment control cables, instrument signal cables and sensor cables, resisting on-site industrial electromagnetic interference and improving equipment operation stability.
- Low & Medium Voltage Power Cables: Used for auxiliary shielding of low-voltage distribution cables to prevent electromagnetic radiation and signal interference with surrounding equipment.
- New Energy & Special Cables: Suitable for new energy vehicle wiring harnesses, outdoor engineering cables and high-flexibility mobile cables, adapting to complex working conditions such as frequent bending and harsh temperature changes.
For cable factories, material selection directly determines finished cable quality and profit margin. Compared with alternative shielding materials, copper polyester tape has outstanding comprehensive advantages: Pure copper tape suffers from easy oxidation, poor insulation and high scrap rate during production; aluminum polyester tape has low shielding efficiency and cannot meet high-end cable certification standards. CU/PET composite tape perfectly solves the above pain points, with higher shielding grade, stable mechanical processability and lower long-term quality failure rate.
It helps cable factories upgrade product grades, expand high-end industrial and communication cable markets, reduce after-sales maintenance costs, and improve overall product profit margins and market competitiveness.
All products adopt industrial roll packaging (76mm standard paper tube, D30 roller) suitable for automatic cable production equipment, supporting continuous unwinding for mass production. Custom services including precise slitting, special thickness matching, customized roll length and halogen-free environmental protection formula are available to meet special standards of European, American and domestic engineering cables, supporting OEM and standardized batch production of cable factories.