Overview
Driven by technological advancements and market demands, bimetallic composite materials are reshaping the wire and cable industry landscape. FISSOT, with its leading copper-clad steel (CCS) and copper-clad aluminum (CCA) production technologies, provides lightweight, high-performance conductor solutions for the automotive and communications industries, achieving performance breakthroughs while reducing costs.
1. Copper-Clad Steel Wire: The Ideal Choice for High-Strength Lightweight Applications
1.1 Core Advantages
Copper-clad steel stranded conductors have become the preferred solution for replacing traditional pure copper conductors due to their excellent mechanical strength and electrical conductivity. FISSOT employs advanced cladding processes to ensure perfect bonding between the copper layer and steel core, achieving:
- Enhanced Strength: Tensile strength 2-3 times that of pure copper
- Weight Reduction: Density reduced by 30%-40%
- Cost Optimization: Significant reduction in raw material costs
- Processing Convenience: Easy to draw and process
1.2 Technical Breakthroughs
Core Principle: Any copper conductor where increased strength allows for reduced diameter is an ideal candidate for copper-clad steel replacement.
FISSOT’s copper-clad steel product line covers multiple specifications including 40% conductivity, meeting diverse application requirements.
1.3 Performance Comparison Data
| Conductor Specification | Material | Diameter | Breaking Force | Weight | Current Capacity |
| 0.13mm² | CCS 40% | 1.0mm | 13kgf | 1.6kg/km | 3-5A |
| 0.22mm² | CCS 40% | 1.1mm | 22kgf | 2.4kg/km | 6.5A |
| 0.35mm² | Pure Copper | 1.5mm | 8.7kgf | 3.8kg/km | 14A |
| 0.50mm² | Pure Copper | 1.7mm | 14kgf | 6.3kg/km | 18A |
Note: Values based on PVC-insulated cables meeting automotive specifications. FISSOT products exceed industry standards.
1.4 Automotive Wire Harness Application Benefits
Case Study 1: Replacing copper conductors with 26 AWG copper-clad steel for low-current signal wires in typical automotive wire harnesses
- Total harness weight reduced by 14%
- Total harness volume reduced by 10%
Case Study 2: Prototype samples for light truck body wire harnesses
- Total harness weight reduced by 15% (12.7kg → 10.8kg)
- Average cross-section reduced by 20%
- Main trunks reduced from 3 bundles to 2 bundles
- Improved overall flexibility, simplified installation
1.5 Copper-Clad Steel Conductor Benefit Comparison
| Cable Specification | Baseline Harness Count | CCS Harness Count |
| 26 AWG CCS | – | 216 |
| 22 AWG Cu | 360 | 144 |
| 20 AWG Cu | 150 | 150 |
| 18 AWG Cu | 72 | 72 |
| 16 AWG Cu | 18 | 18 |
| Total Wires | 600 | 600 |
| Baseline Cross-Section | 100% | 90% |
| Baseline Weight | 100% | 86% |
2. Copper-Clad Aluminum Wire: The Main Force in the Lightweight Revolution
2.1 Technical Breakthroughs
FISSOT has overcome the technical challenges of drawing fine copper-clad aluminum wires, achieving stable production of 0.005in (0.127mm) fine wires in daily operations, opening possibilities for revolutionary new applications.
2.2 Copper-Clad Aluminum vs. Copper Cable Performance Comparison
| Conductor | Structure | Resistance | Cable Weight | Current Capacity |
| 10 AWG CCA | 19/0.57mm | 5.6Ω/km | 16kg/km | 47A |
| 12 AWG Cu | 19/0.46mm | 5.9Ω/km | 27kg/km | 46A |
Conversion Rule: Copper conductors can be converted to copper-clad aluminum conductors two sizes larger, resulting in:
- Minimal changes in resistance and current capacity
- Weight reduction of approximately 40%
- Significant cost reduction
2.3 Automotive Battery Cable Application Case
Large Sedan Battery Cable Retrofit Comparison:
| Specification | Resistance (mΩ/m) | Cable Diameter (mm) | Cable Weight (kg/m) | Length | Total Weight |
| 2 AWG Copper | 0.51 | 9.8 | 0.35 | 6.1m | 2.1kg |
| 1/0 AWG 10% CCA | 0.54 | 12.2 | 0.23 | 6.1m | 1.4kg |
Benefit: Changing the material of just one component reduces vehicle weight by 0.7kg while lowering production costs.
2.4 Automotive Wire Harness Weight Reduction Analysis
| Item | Copper Conductor Solution | CCA Conductor Solution |
| Conductor Weight | 16.7kg | 9.5kg |
| Insulation Weight | 4.9kg | 6.0kg |
| Total Final Weight | 21.6kg | 15.5kg |
| Weight Reduction | – | 6.1kg (28%) |
3. Optimized Wire Harness Design: Bimetallic Combination Solutions
3.1 Best Practices
In wire harnesses that transmit both power and signals, using bimetallic conductor combinations achieves maximum benefits:
- Power Conductors → Use copper-clad aluminum (FISSOT high-conductivity series)
- Low-Current Conductors → Use copper-clad steel (FISSOT high-strength series)
3.2 Light Truck Door Harness Prototype Case
| Item | Weight |
| Bimetallic Harness Prototype | 0.9kg |
| Traditional Production Harness | 1.4kg |
| Weight Reduction | 35.7% |
Note: Weight represents complete harness assemblies including all terminals, connectors, tapes, and mounting brackets. Additional Advantage: Bimetallic harnesses demonstrate significantly improved flexibility.
4. High-Frequency Signal Applications: Unique Advantages of Copper-Clad Aluminum
4.1 Technical Features
For applications transmitting or processing high-frequency signals with copper-clad aluminum:
- Can replace pure copper with the same wire gauge
- Weight reduction increases from 40% to over 60%
- Costs reduced severalfold
4.2 Typical Application Areas
- High-frequency signal transmission in coaxial cables
- Braided shielding wires for shielding or grounding straps diverting unwanted signals
- Ultra-fine wire applications requiring sizes as small as 36 AWG (0.127mm)
5. Durability and Reliability of Bimetallic Components
5.1 Strength Advantages of Copper-Clad Aluminum
- Cold-drawn CCA strength ≥ pure copper
- Larger conductor diameter reduces stress levels, extending fatigue life
- FISSOT employs cold-drawing processes to ensure excellent fatigue resistance
5.2 Durability of Copper-Clad Steel
- Single wires are difficult to break (even at 0.16mm)
- Exhibits the durability limit characteristic of non-ferrous metals
- Infinite fatigue life within allowable stress levels
- Steel is the best metal for resisting metal fatigue
5.3 Historical Lessons and Modern Improvements
1970s Problems:
- CCA conductors in battery cables experienced fatigue cracking due to engine vibration
- CCA was difficult to draw into wires below 1.5mm at the time
- Larger single wires generated high stress during bending
- Annealing reduced tensile strength and shortened fatigue life
FISSOT Modern Solutions:
- Battery cable conductor single wires no larger than 0.57mm
- CCA conductors composed of finer single wires are less susceptible to vibration-induced fatigue failure
- Cold-drawn single wires recommended to improve tensile strength
- Fatigue life exceeds that of annealed copper wires
5.4 Corrosion Protection Solutions
Problem: Unprotected cut ends of bimetallic wires exposed to the atmosphere pose risks of accelerated electrolytic corrosion (road salt, battery acid, etc.)
Solutions:
- Heat-shrink tubing sealing
- Standard sealed connectors
- Solder dipping treatment
- Plastic sol coating on cut ends
Verification: Alternator cable terminals sealed with heat-shrink tubing remained in good condition after severe corrosion testing.
6. Summary and Outlook
6.1 Market Driving Factors
Core factors driving the expansion of bimetallic cable applications:
- Persistently high copper prices
- High oil prices driving vehicle lightweighting demands
- Urgent lightweighting needs in new energy vehicles
- Growing demand for high-frequency cables in 5G network construction
6.2 FISSOT Cost-Effectiveness Advantages
- Production cost of 1 foot of bimetallic cable is similar to 1 foot of copper cable with the same structure
- Bimetallic cables can replace thicker and/or heavier copper cables
- Provides bimetallic cables with significant cost-effectiveness and competitive advantages
6.3 Application Recommendations
| Material | Applicable Scenarios | Main Advantages |
| Copper-Clad Aluminum | Copper-core power cables for equipment and automotive wiring | Weight reduction, cost reduction, maintained or improved performance |
| Copper-Clad Steel | Copper cables sized by strength requirements | Reduced weight, volume, and component wiring costs |
About FISSOT
FISSOT specializes in the R&D and production of bimetallic composite materials, equipped with advanced copper-clad steel and copper-clad aluminum production lines and a rigorous quality control system. We provide customers with:
- ✅ Customized conductor solutions
- ✅ Quality assurance meeting international standards
- ✅ Technical support and application guidance
- ✅ Reliable supply chain guarantees
Contact us to obtain exclusive product solutions and technical support.