C10100 vs. C10200 Copper: What's the Difference?

C10100 and C10200 are both oxygen-free copper grades identified under the Unified Numbering System (UNS). They are manufactured to control oxygen and other impurities, making them suitable for applications requiring high-purity copper.

Although they belong to the same general material category, their chemical composition requirements are different.

C10100 – Oxygen-Free Electronic Copper (OFE)

C10100 is commonly known as Oxygen-Free Electronic (OFE) copper.

It is a high-purity copper grade with a minimum copper content of 99.99% and a maximum oxygen content of 0.0005% (5 ppm) under commonly referenced composition limits.

Its main characteristics include:

Minimum copper content: 99.99%.

Maximum oxygen content: 5 ppm.

High electrical conductivity.

Good thermal conductivity.

Excellent formability in suitable tempers.

Low susceptibility to hydrogen embrittlement associated with copper oxide.

C10100 is often selected for electrical, electronic, vacuum, and other specialized applications where strict material purity requirements are specified.

C10200 – Oxygen-Free Copper (OF)

C10200 is commonly known as Oxygen-Free (OF) copper.

It has a minimum copper content of 99.95% and a maximum oxygen content of 0.0010% (10 ppm) under commonly referenced composition limits.

Its main characteristics include:

Minimum copper content: 99.95%.

Maximum oxygen content: 10 ppm.

High electrical conductivity.

Good thermal conductivity.

Good formability and fabrication characteristics.

Low oxygen content compared with conventional oxygen-bearing copper.

C10200 is widely used in electrical and industrial applications where oxygen-free copper is required but the stricter C10100 composition limits may not be necessary.

What Do They Have in Common?

Both grades offer several important characteristics:

High copper content.

Low oxygen content.

Good electrical and thermal conductivity.

Good cold-working and forming capabilities in suitable tempers.

Availability in various wrought product forms.

Both can be supplied as sheets, plates, strips, rods, and other copper products, depending on the manufacturer's product range.

The main difference is not that one is oxygen-free and the other is not. Both are oxygen-free copper. The difference lies in their specific composition requirements and the applications for which they are selected.

Chemical composition is the most direct way to distinguish C10100 from C10200.

The two grades have different minimum copper content and maximum oxygen content requirements.

Chemical Composition Comparison

Note: These are commonly referenced composition limits. Actual acceptance requirements should be checked against the applicable material specification and its current edition.

Why Does C10100 Have a Higher Purity Requirement?

The main distinction is the stricter control of copper purity and oxygen content.

For applications involving high electrical performance, sensitive electronic equipment, or demanding vacuum environments, controlling trace impurities can be important.

Even small amounts of certain elements may affect electrical conductivity and other material properties.

C10100 therefore has tighter composition requirements than C10200.

However, this does not mean C10200 is an inferior material for every application. If the design only requires the properties specified for C10200, purchasing C10100 may add cost without providing a meaningful benefit.

Do Other Impurity Elements Matter?

Yes.

Copper purity should not be judged only by the copper percentage.

Other elements, including lead, iron, nickel, zinc, phosphorus, sulfur, arsenic, antimony, and bismuth, may also be controlled by the applicable specification.

For high-purity copper, buyers should pay attention to the individual impurity limits and the actual chemical analysis results.

A copper content figure alone does not provide a complete picture of material composition.

C10100 vs. C10200 Copper Chemical Composition Comparison

Electrical conductivity is one of the main reasons buyers choose oxygen-free copper.

Both C10100 and C10200 provide high electrical conductivity, but their specified minimum values can differ.

What Is IACS?

IACS stands for International Annealed Copper Standard.

It is a reference system used to express the electrical conductivity of a material relative to standard annealed copper.

The reference value is 100% IACS at 20°C.

A higher IACS percentage indicates higher electrical conductivity relative to this reference.

Conductivity Comparison

These are commonly published minimum conductivity values for the respective grades in the annealed condition. Actual requirements should be checked against the applicable product specification and temper.

Does C10100 Always Have Better Conductivity?

Not necessarily in every delivered product.

Although C10100 has a higher commonly specified minimum conductivity, the actual result depends on several factors:

Chemical composition.

Trace impurity concentrations.

Annealing condition.

Cold-working history.

Material temperature during testing.

Testing method and sample condition.

For example, a C10200 copper plate with suitable composition and processing may show a conductivity result higher than the minimum specified for its grade.

Therefore, buyers should specify the required electrical conductivity rather than assuming that the grade name alone guarantees a particular test result for every product condition.

When Should Buyers Specify Conductivity Separately?

A separate conductivity requirement is particularly useful when purchasing copper for:

Electrical busbars.

Conductive connectors.

Power transmission components.

Electrical contacts.

Precision electronic components.

If the component has a defined electrical performance requirement, include the minimum % IACS value and reference test temperature in the purchase specification.

Need copper with a specified conductivity requirement? We can review your technical requirements and discuss the available material grade, temper, and inspection documentation.

C10100 and C10200 have similar general processing characteristics. Both can be used for cutting, bending, stamping, machining, and other manufacturing operations.

However, the final mechanical properties depend heavily on the supplied temper and processing history.

Mechanical Properties and Temper

Copper sheets and plates may be supplied in different tempers, depending on the product standard and manufacturer.

Common conditions include:

For both C10100 and C10200, buyers should confirm the actual temper instead of assuming that all products of the same grade have identical mechanical properties.

If tensile strength, elongation, or hardness is critical, these properties should be specified separately.

Bending and Forming

Both grades can offer good formability in suitable annealed conditions.

For applications involving deep drawing, repeated bending, or complex forming, buyers should consider:

Material thickness.

Temper.

Bending radius.

Grain direction, where relevant.

Required elongation.

Forming method.

An annealed copper sheet is generally more suitable for extensive forming than a hard-temper sheet of the same grade.

Machining and Fabrication

C10100 and C10200 can be processed through conventional copper fabrication methods.

Depending on the component design, these may include:

Shearing and cutting.

Drilling and punching.

Milling and machining.

Bending and forming.

Welding and brazing.

For machining applications, the copper's softness and tendency to form built-up material on cutting tools should be considered when selecting cutting parameters and tooling.

Welding and Brazing

Both oxygen-free copper grades can be used in suitable joining processes.

However, joining quality depends on the process, joint design, surface preparation, filler material, and thermal conditions.

For components involving vacuum or high-purity applications, buyers should also consider contamination control and the cleanliness of the finished joint.

The key purchasing point is that C10100 does not automatically have better mechanical or processing properties than C10200. The specified temper and finished-product condition are often more important for these characteristics.

Copper Sheet Bending and Forming Process

C10100 Copper Applications

1. High-Purity Electronic Components

Used in electronic components where high copper purity and consistent electrical performance are required.

2. Semiconductor Manufacturing Equipment

Suitable for certain semiconductor equipment components where material purity, controlled contamination, and conductivity are important.

3. Vacuum Equipment

Used in vacuum-related applications where oxygen content and material cleanliness may be critical.

4. Specialized Electrical Conductors

Suitable for conductive components with strict material specifications.

5. High-Purity Copper Components

Selected for components where the project specification explicitly requires C10100 or equivalent OFE material.

C10200 Copper Applications

1. Electrical Conductors

Used in conductive components where high conductivity and oxygen-free copper are required.

2. Busbars and Electrical Components

Suitable for busbars and other electrical parts when the specified conductivity, dimensions, and mechanical properties are satisfied.

3. Industrial Copper Components

Used in fabricated copper components for machinery and industrial equipment.

4. General Oxygen-Free Copper Applications

Suitable for applications that require low oxygen content but do not necessarily require the stricter C10100 composition limits.

Which Grade Should You Choose?

The following table provides a practical purchasing reference.

Do not select C10100 simply because it has a higher purity specification. If C10200 fully meets the application's requirements, it may be a more economical choice.

Oxygen-Free Copper Applications in Electrical and Electronic Equipment

Material substitution is a common issue in international copper purchasing.

A supplier may recommend C10200 instead of C10100, or offer C10100 as an alternative to C10200.

Although the two grades are similar, they should not be treated as automatically interchangeable.

Can C10200 Replace C10100?

Not automatically.

C10200 has less stringent minimum copper content and maximum oxygen content requirements.

If the original specification requires:

Minimum copper content of 99.99%.

Maximum oxygen content of 5 ppm.

Specific OFE material designation.

C10200 does not automatically meet those requirements.

Even if a particular C10200 batch happens to show low oxygen content, the grade substitution still needs to be evaluated against the complete specification and approved by the buyer or relevant engineering authority.

Can C10100 Replace C10200?

C10100 may be a technically acceptable candidate when replacing C10200, but the substitution should still be checked.

Buyers should consider:

Whether the chemical composition meets the original requirements.

Whether conductivity is suitable.

Whether the specified temper is available.

Whether the mechanical properties meet the design requirements.

Whether the higher material cost is justified.

A higher-purity material does not automatically guarantee better performance in every component.

Material Substitution Checklist

For drawing-based orders, the safest approach is to submit the proposed alternative grade and its supporting material data for written approval before production.

We can review C10100 and C10200 material requirements and help buyers identify the differences in grade, dimensions, temper, and available certification before quotation.

Discuss Your Copper Grade Requirements

Price is an important factor when selecting oxygen-free copper, but the lowest price per kilogram does not always mean the lowest overall purchasing cost.

C10100 generally has stricter purity and oxygen requirements, which may involve more demanding material production and quality control.

However, the actual price difference between C10100 and C10200 depends on the manufacturer, raw material market, product specifications, quantity, and certification requirements.

Factors Affecting C10100 and C10200 Prices

1. Material Grade

C10100 has stricter composition requirements than C10200. The required production controls and material availability can affect the quotation.

2. Product Dimensions

Thickness, width, and length influence material consumption and processing costs.

For example, a thick copper plate may require different rolling, leveling, cutting, and handling processes compared with a thin copper sheet.

3. Order Quantity

Larger orders may offer better production efficiency and more favorable unit pricing.

Small orders may involve minimum-order charges or additional processing costs.

4. Temper and Surface Finish

Special temper requirements, surface protection, and additional finishing operations may increase the total cost.

5. Inspection and Certification

Additional chemical analysis, oxygen testing, conductivity testing, and third-party inspection may involve extra costs.

How Should Buyers Compare Quotations?

When requesting quotations for C10100 and C10200, make sure the offers are based on the same product conditions.

A quotation for C10200 should not be compared directly with a C10100 quotation unless the differences in grade and technical requirements are clearly understood.

If both grades meet the application's requirements, buyers can compare their total supply costs and decide whether the stricter C10100 specification provides enough additional value.

We supply copper materials for industrial, electrical, and precision manufacturing applications.

Our oxygen-free copper supply range includes C10100 and C10200 copper sheets and plates. Material selection can be discussed according to the required grade, product standard, dimensions, temper, surface condition, and certification requirements.

Oxygen-Free Copper Product Range

Available Supply Specifications

What Can We Help You Confirm?

When you contact us, we can review:

Whether C10100 or C10200 is more suitable for your application.

Whether the requested dimensions are available.

Whether the required temper and surface finish can be supplied.

Which chemical composition and inspection documents can be provided.

Whether additional oxygen or conductivity testing is required.

Whether cutting and protective packing are needed.

We understand that different projects have different material acceptance requirements. Therefore, we recommend confirming the complete technical specification before finalizing the quotation.

Inspection

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