Raytron Technical Review RESEARCH ARTICLE cca-70-analysis

CCA-70% IACS: High-Conductivity Grade Analysis

Gao-Lei Xu¹ *

¹RAYTRON Group Technology Research Center, China

^*Corresponding author

Received: 2025-12 Accepted: 2026-02 Published: 03/2026

DOI: 10.1234/raytron.2026.WP-02-02

Abstract

CCA-70% provides enhanced conductivity for applications requiring near-copper performance while maintaining significant cost and weight advantages. This white paper analyzes the performance, manufacturing considerations, and optimal applications for this high-conductivity grade.

Key Findings

Conductivity 70% IACS Enhanced conductivity for demanding applications
Resistance Reduction 13% Lower resistance compared to CCA-62%
Derating Factor 0.90 Improved ampacity vs CCA-62%'s 0.80
Copper Volume 18-22% Higher copper content for better performance

Keywords

CCA-70%;high-conductivity CCA;specifications;applications;performance analysis

1. Introduction

CCA-70% fills the gap between standard CCA-62% and premium grades.

CCAetc.Conductivity

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Figure Fig. 1 CCA Grade Conductivity Comparison

2. Material Specifications

3. Performance Analysis

3.1 Conductivity Enhancement

3.2 Ampacity Improvement

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Figure Fig. 2 Ampacity Improvement Curve

Derating factor: 0.90 vs CCA-62%'s 0.80

4. Manufacturing Considerations

5. Application Optimization

6. Conclusion

CCA-70% provides an excellent cost-performance choice for applications requiring higher conductivity.

Frequently Asked Questions

Why choose CCA-70% over CCA-62%?

CCA-70% offers 14% higher conductivity and 13% lower resistance than CCA-62%, making it suitable for applications requiring better electrical performance while maintaining significant cost and weight advantages over copper.

What applications benefit most from CCA-70%?

CCA-70% is ideal for high-current applications, long cable runs where voltage drop is critical, premium coaxial cables, and applications where CCA-62% conductivity is marginal.

How does the cost compare to CCA-62%?

CCA-70% typically costs 10-15% more than CCA-62% due to higher copper content, but still offers 25-30% cost savings compared to pure copper while providing significantly better performance.

Figures

Create CCAetc. GradeConductivityComparison Diagram

Fig. 1 CCA Grade Conductivity Comparison

Current-Carrying CapacityImprovement Curve

Fig. 2 Ampacity Improvement Curve

Tables

Table 1 Grade Positioning

Grade	Conductivity	Positioning
CCA-62%	62-65% IACS	standards
CCA-70%	70-73% IACS	High Conductive
CCA-80%	80-83% IACS	ExcellentQuality

Table 2 Composition Specifications

Component	Specification
Core Material	Aluminum1350
Cladding Layer	Copper(≥99.9%)
Copper Volume Ratio	18-22%

Table 3 Performance Comparison

Property	CCA-62%	CCA-70%	Improvement
Conductivity	63% IACS	72% IACS	+14%
Resistance	2.75 μΩ·cm	2.40 μΩ·cm	-13%

Table 4 Application Optimization

Application	CCA-62%	CCA-70%	Recommended
HighCurrent-CarryingRequiredRequirement	edge	Applicable	CCA-70%
Long Cable	ResistanceHigh	Applicable	CCA-70%
ExcellentQualityCoaxial	General	Applicable	CCA-70%

References

ASTM International ASTM B566: Copper-Clad Aluminum Wire ASTM (2020)

Authoritative References

ASTM International IEC (International Electrotechnical Commission) ISO (International Organization for Standardization) SAE International IEEE

Gaolei Xu

Senior Materials Scientist

Credentials & Honors

• CTO, Raytron Group
• Zhejiang Provincial High-level Talent Special Support Program - Young Talent
• Shaoxing "Technology Vice President"
• Shaoxing Science and Technology Commissioner
• Member of National Technical Committee 243 on Heavy Metals (SAC/TC 243/SC2)

National Standards (Lead Author) View Official

GB/T 27671-2011 - Copper Profiles for Electrical Conductors
YS/T 1043-2015 - Silver-bearing Oxygen-free Copper Strip for Motor Commutators
YS/T 974-2014 - Copper and Copper Alloy Strip for Composite Contact Materials
YS/T 1082-2015 - Copper Strip for Lamp Lead Stents

Patents (Inventor) Search Patents

CN104959396A - Production Process of Copper Strip for Composite Contact Materials
CN106077125A - Production Process of Copper Profile for Magnetic Pole Coils
CN201410710206 - Conductive Material for High-speed Railway Traction Motors and Production Method
CN201310719717 - Method for Controlling Strip Shape of Copper Strip Blank by Continuous Extrusion
CN201310720126 - Device for Controlling Strip Shape of Copper Strip Blank by Continuous Extrusion
CN201310376884 - Five-in-one Copper Strip Edge Treatment Equipment for Transformers
CN201420184755 - Continuous Extrusion Die Flow Promotion Device
CN201320761640 - Continuous Extrusion Waste Cleaning Device

Areas of Expertise

Copper-Clad Aluminum (CCA) Technology Copper-Clad Steel (CCS) Manufacturing Bimetallic Composite Materials PV Ribbon for Solar Cells Battery Tab Materials for EV Applications Continuous Extrusion Technology

Selected Publications

• Research and Application of Rolling Method for Manufacturing Metal Laminated Composites, Aluminum Processing Journal, 2008
• Annealing Process Research of Copper-Aluminum Composite Strip
• Research on Preparation Process of Copper/Aluminum Composite Strip for Cables
• Interface Microstructure Evolution of Rolled Copper/Aluminum Composite Strip During Annealing

Mr. Xu Gaolei is a distinguished expert in non-ferrous metal processing with over 15 years of experience. He is recognized as a Young Talent under the Zhejiang Provincial High-level Talent Special Support Program. He leads R&D initiatives in bimetallic composite technologies and has contributed significantly to the standardization of copper and bimetallic materials in China.

Click standard/patent codes to view official documents