Copper C101 | CU OFE

C10100 copper, also known as Cu-OFE (Oxygen-Free Electronic Copper), is a high-purity oxygen-free copper grade with ultra-high conductivity, extremely low impurity and oxygen content. It is specially developed for high-end precision scenarios such as vacuum equipment, semiconductor devices, high-frequency RF components and high-current electrical systems. Different from conventional C110 electrolytic copper, C101 has strict purity control and more stable electrical and thermal performance.

As a professional precision metal CNC machining manufacturer, Evefab has mature processing technology for C101 oxygen-free copper. Aiming at the characteristics of high ductility, low machinability and thermal deformation sensitivity of C101 copper, we formulate exclusive tool schemes and processing parameters to stably deliver high-precision, high-cleanliness oxygen-free copper parts for global industrial customers.

1. Basic Material Information

1.1 International Standard Designation Comparison

C10100 corresponds to multiple international authoritative standards, with unified core performance parameters but different specification details. Evefab strictly verifies material standards according to customer drawings and procurement specifications to avoid grade mismatch and performance deviation:

Engineering Reminder: C10100, Cu-OFE and equivalent grades cannot be completely interchanged in all scenarios. For formal production, Evefab recommends clarifying implementation standards, material temper, conductivity indicators and certification requirements to ensure part service performance.

1.2 Core Material Classification & Parameters

• Material Category: High-purity oxygen-free high-conductivity copper

• Common Names: C101 Copper, C10100 Copper, OFE Copper, Oxygen-Free Electronic Copper

• Copper Purity: ≥99.99% (far higher than ordinary pure copper)

• Oxygen Content: ≤0.0005% (ultra-low oxygen, no hydrogen embrittlement risk)

• Annealed Conductivity: 101% IACS (industry top-level conductivity)

• Machinability Rating: 20 (free-cutting brass = 100, moderate processing difficulty)

1.3 Material Application Positioning

C10100 oxygen-free copper is not designed for structural load-bearing scenarios. Its core advantages lie in ultra-high purity, ultra-high electrical/thermal conductivity and vacuum compatibility. It is the preferred premium material for high-end precision conductive, heat dissipation and vacuum equipment parts. Professional institutions such as KME and CDA clearly mark that Cu-OFE is suitable for electrical engineering, vacuum technology and high-frequency electronic equipment.

2. Physical Properties of C101 Copper

The following data are authoritative typical engineering values integrated from CDA and KME official datasheets. The actual mechanical properties of C101 copper are greatly affected by material temper, section size and processing technology. Evefab will select materials and optimize processes according to actual working conditions to match part performance requirements.

2.1 Temper-Dependent Mechanical Properties

The tensile strength, yield strength and elongation of C101 copper vary greatly with temper. Evefab matches the optimal material temper according to part rigidity, tensile resistance and toughness requirements:

2.2 Core Performance Advantages & Application Scenarios

Electrical Conductivity: 101% IACS ultra-high conductivity, higher than ordinary high-conductivity copper, which can minimize current loss and contact resistance. Suitable for high-current busbars, RF high-frequency components, vacuum conductive parts and precision electrical contacts.

Thermal Conductivity: Up to 394 W/m·K excellent heat transfer performance, suitable for semiconductor cooling parts, power electronic heat sinks, thermal diffusion plates and high-precision heat transfer fixtures.

Wear Resistance Reminder: C101 copper has low hardness and high ductility, excellent for forming and conduction, but not suitable for high-load friction and abrasive wear working conditions. Wear-resistant parts will be recommended with bronze alloy by Evefab.

3. Chemical Properties of C101 Copper

3.1 Ultra-High Purity Chemical Composition

C10100 oxygen-free copper has extremely strict impurity control, with far lower impurity content than C110 copper. It is the core reason for its excellent vacuum and high-temperature performance:

3.2 Oxygen-Free Core Advantage

Ultra-low oxygen content avoids hydrogen embrittlement of copper materials in high-temperature and hydrogen environment, ensuring stable performance of parts in vacuum brazing, high-temperature processing and long-term high-frequency operation. It is an irreplaceable material for semiconductor and vacuum equipment.

3.3 Corrosion & Oxidation Resistance

C101 copper has good atmospheric and water corrosion resistance, and is not prone to stress corrosion cracking. It is stable in conventional industrial environments. However, it is still corroded by strong oxidizing acid, ammonia, sulfur and high-chloride environments. For harsh working conditions, Evefab provides targeted surface anti-oxidation and anti-corrosion treatment solutions.

3.4 Welding & Connection Performance

Authoritative CDA evaluation shows that C101 copper has excellent welding performance: soldering and brazing are excellent, gas shielded welding and butt welding are good, while oxyacetylene welding is fair, and spot welding & seam welding are not recommended. For precision vacuum and electronic parts, Evefab adopts low-heat brazing and soldering processes to avoid deformation and ensure air tightness and conductivity.

4. C101 Copper CNC Machinability Analysis

Overall Machining Difficulty: Moderate to Difficult

C101 copper has low hardness and ultra-high ductility, with a machinability rating of only 20. It is easy to produce burrs, material smearing, tool adhesion and thermal deformation during processing, which puts forward higher requirements for tool selection, parameter setting and fixture design. Evefab has summed up mature exclusive processing technology through long-term precision machining practice.

4.1 Recommended Tool Configuration

• Conventional Processing: Sharp polished positive rake angle carbide tools, ensure smooth cutting and chip removal

• High-Precision & Mass Production: PCD diamond tools, effectively avoid tool adhesion and improve surface finish

• Core Key: Tool sharpness is more important than hardness. Dull tools will cause serious smearing and dimensional deviation of C101 copper

4.2 Reference CNC Cutting Parameters

The following parameters are standard starting values. Evefab will dynamically optimize according to tool specification, machine rigidity, part structure and finish requirements:

4.3 Common Machining Problems & Evefab Professional Solutions

Burr Generation

C101 high ductility leads to obvious burrs at hole openings, groove edges and thin-wall corners.
Solution: Use brand-new sharp tools, optimize feed parameters, design reserved chamfers, and match professional precision deburring process after processing.

Material Smearing & Tool Adhesion

Improper cutting speed and tool bluntness cause copper material to rub and adhere to the tool surface, resulting in poor surface finish.
Solution: Adopt polished tools with positive rake angle, reasonably increase cutting speed, strengthen high-pressure coolant lubrication, and avoid tool rubbing.

Continuous Long Chips

Ductile C101 copper produces unbroken long chips, which affect chip removal and processing stability.
Solution: Select tools with chip-breaking structure, adjust feed rate, and optimize chip removal system.

Thermal Dimensional Deformation

Large thermal expansion coefficient leads to dimensional change caused by processing heat, affecting precision tolerance.
Solution: Control single cutting allowance, reduce processing heat, stabilize workshop temperature, and perform unified measurement after parts are fully cooled.

Thin-Wall Deformation

Thin-wall (≤1mm) C101 parts have low rigidity and are easy to deform under clamping and cutting force.
Solution: Customize soft jaw fixtures, reduce clamping pressure, adopt layered light finishing, and support thin-wall structures in real time.

4.4 Machining Tolerance & Surface Finish Capability

Through precise process control and high-precision equipment, Evefab stably realizes high-precision processing of C101 oxygen-free copper parts:

• Conventional dimensional tolerance: ±0.05 mm

• Precision key feature tolerance: ±0.01–0.02 mm

• Conventional surface roughness: Ra 0.8–3.2 μm

• Ultra-fine finishing roughness: Ra ≤0.4 μm

• Vacuum parts support ultra-clean processing to meet semiconductor and high-vacuum environmental requirements

4.5 Compatible Machining Processes & Scenario Suitability

C101 copper supports full-process precision CNC processing. Evefab selects optimal processes according to part geometry and usage scenarios:

5. Typical Application Fields of C101 Copper Parts

5.1 High-End Electrical & Power Equipment

Relying on 101% IACS ultra-high conductivity, C101 is used for high-current and high-precision conductive parts: busbars, precision terminals, electrical contacts, switchgear conductive components and grounding parts, effectively reducing power loss.

5.2 Semiconductor Manufacturing Equipment

High purity, low oxygen and high cleanliness make C101 the preferred material for semiconductor equipment. Evefab processes vacuum fixtures, thermal conductive plates, precision cooling blocks and electrical interface parts, meeting strict contamination control requirements.

5.3 Vacuum & Ultra-High Vacuum Equipment

It is the most core application scenario of C101 copper. Ultra-low oxygen content avoids air release and hydrogen embrittlement in vacuum environment, suitable for vacuum cavity parts, vacuum conductive hardware, vacuum electrodes and high-vacuum electrical connectors.

5.4 RF & High-Frequency Electronic Equipment

Excellent high-frequency conductivity and stable electrical performance, suitable for RF connectors, waveguide components, high-frequency shielding parts and microwave tube parts, ensuring stable signal transmission.

5.5 High-Precision Thermal Management Parts

394 W/m·K ultra-high thermal conductivity, widely used in power electronics cooling blocks, thermal spreaders and precision heat transfer fixtures, suitable for high-precision heat dissipation scenarios of electronic and electrical equipment.

5.6 Aerospace & High-Precision Automation Equipment

Used for aerospace precision conductive and thermal components, robot sensor interfaces and special conductive fixtures. Evefab provides complete material certification and traceability documents to meet high-standard industrial delivery requirements.

6. Evefab C101 Oxygen-Free Copper CNC Machining Core Advantages

6.1 Professional Material Grade Distinction & Verification

Evefab engineering team accurately distinguishes C101 (OFE oxygen-free copper), C110 (ETP electrolytic copper) and C102 ordinary oxygen-free copper, avoids material substitution errors, strictly verifies raw material purity, oxygen content and conductivity, and provides official MTR material test reports.

6.2 Customized Exclusive Processing Technology

Aiming at the low machinability, high ductility and thermal sensitivity of C101 copper, we formulate exclusive process schemes including tool optimization, parameter matching, fixture customization, burr suppression and thermal deformation control to solve common processing pain points stably.

6.3 Full-Scene Precision Machining Capacity

Support 3/4/5-axis linkage milling, precision turning, Swiss micro-processing and other full-process services, meet the processing requirements of conventional parts, micro-precision parts and complex multi-angle structural parts, and support ultra-clean processing of vacuum semiconductor parts.

6.4 One-Stop Custom Service

Complete closed-loop service: Drawing DFM review → Material verification → Process planning → Prototype trial production → Precision processing → Deburring & finishing → Strict quality inspection → Batch delivery, greatly simplifying the procurement process for overseas B2B customers.

6.5 Strict Quality Control & Traceability System

Equipped with CMM three-dimensional detector, roughness meter and precision thread detection equipment, realizing full-dimensional inspection and GD&T geometric tolerance verification. Support full batch material traceability and customized certification documents.

C101 vs C110 Copper Core Performance Comparison

Engineering Summary & Recommendation

C10100 (Cu-OFE) oxygen-free electronic copper is a premium high-purity copper material, which is irreplaceable in high-precision, high-cleanliness, vacuum and high-frequency electronic scenarios. Its ultra-high conductivity, ultra-low impurity and oxygen content ensure stable performance of high-end equipment parts.

In terms of CNC machining, the high ductility and low machinability of C101 require professional process control. Evefab relies on rich precision copper processing experience, through optimized tool matching, stable fixture support, precise parameter control and perfect post-processing technology, to stably produce high-precision, high-cleanliness C101 oxygen-free copper parts for global customers.

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