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C101

# Copper 101 – High Conductivity (ETP) Tube

C10100 / CW004A

## Overview

Copper 101 is the industry standard high-conductivity copper, also known as Electrolytic Tough Pitch (ETP) copper. With a nominal conductivity of 100% IACS, it is the material of choice for electrical conductors, busbars, and components where maximum electrical and thermal conductivity are required. Copper 101 is tough, ductile, and malleable with excellent cold and hot working characteristics.

### Chemical Composition

Element

Min

Max

Copper (Cu)

99.90%

—

Oxygen (O)

—

0.04%

Others (Total)

—

0.10%

### Alloy Designations

CEN CW004A 

BS C101 

UNS C11000 

ISO Cu-ETP 

### Mechanical Properties

Tensile Strength 200–360 MPa 

Proof Stress (0.2%) 50–340 MPa 

Elongation (A50) 5–50% 

Hardness 40–110 HV 

Machinability Rating 20 (vs. 100 for free-cutting brass) 

### Physical Properties

Density 8.92 g/cm³ 

Melting Point 1,083°C (1,981°F) 

Electrical Conductivity 100% IACS 

Electrical Resistivity 0.171 × 10⁻⁶ Ω·m 

Thermal Conductivity 391 W/m·K 

Coefficient of Thermal Expansion 16.9 × 10⁻⁶ /K 

Modulus of Elasticity 117 GPa 

## Typical Applications

-   Electrical busbars and conductors
-   Power distribution switchgear
-   General engineering components
-   Electronics and PCB connectors
-   Telecommunications equipment
-   Roofing and architectural cladding
-   Heat exchangers and heat sinks

## Fabrication & Joining

-   Excellent cold working in annealed condition
-   Very readily hot worked
-   Soldering: Excellent
-   Brazing: Good
-   Butt Welding: Good
-   Gas Shielded Arc Welding: Fair
-   Annealing temperature: 370–650°C

## Need C101 Copper Tube?

Contact our sales engineers for a custom quote on C101 (C10100 / CW004A) copper tube — tailored dimensions, tempers, and finishing options for your exact specifications.

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