How to Check the Purity of C10100 Copper

C10100 is a high-purity copper grade classified as Oxygen-Free Electronic Copper (OFE) under the Unified Numbering System (UNS).

It is produced through controlled refining and manufacturing processes to achieve high copper purity and a very low oxygen content. Unlike conventional oxygen-bearing copper, C10100 is designed for applications where oxygen-related effects and electrical performance need to be carefully controlled.

Its main characteristics include:

Minimum copper content of 99.99%, based on the applicable composition definition.

Maximum oxygen content of 0.0005% (5 ppm) under the commonly referenced C10100 composition limits.

High electrical conductivity, with a minimum of 101% IACS in the annealed condition under the Copper Development Association's published data.

Good thermal conductivity.

Excellent formability and suitability for demanding electrical and electronic applications.

Low susceptibility to hydrogen embrittlement associated with copper oxide.

C10100 Oxygen-Free Copper Sheets and Plates

Typical Applications of C10100 Copper

C10100 is selected for applications where material purity and oxygen control are important.

The required copper form depends on the component design and manufacturing process. C10100 is available in forms such as sheets, plates, strips, rods, and other wrought products.

Copper purity and oxygen content are closely related to material quality, but they are not the same measurement.

Understanding the difference is essential when evaluating high-purity copper.

Copper Purity

Copper purity refers to the proportion of copper in the material, determined according to the applicable chemical composition requirements.

For C10100, the commonly published minimum copper content is 99.99%.

This means the material must meet the specified high-purity composition requirements, with individual impurity elements controlled within their respective limits.

Typical impurity elements considered in high-purity copper analysis include:

Lead (Pb)

Iron (Fe)

Zinc (Zn)

Phosphorus (P)

Nickel (Ni)

Arsenic (As)

Antimony (Sb)

Bismuth (Bi)

Sulfur (S)

Selenium (Se)

Even small quantities of these elements can matter in applications requiring high electrical conductivity, thermal performance, or controlled material behavior.

One important detail is that 99.99% copper content should not be interpreted as meaning that every impurity element can be present at any concentration as long as the total remains below 0.01%.

Individual impurity limits also matter.

In addition, the copper percentage shown in a chemical composition table may be determined by difference rather than by a direct measurement of copper alone. For C10100, the published composition convention treats copper content exclusive of silver.

Therefore, when reviewing a material certificate, buyers should check the composition basis and individual impurity results instead of relying only on a single copper percentage.

Oxygen Content

Oxygen content indicates how much oxygen is present in the copper material, usually expressed in weight percent (wt.%) or parts per million (ppm).

For C10100, the commonly referenced maximum oxygen content is:

0.0005 wt.% = 5 ppm

The conversion is:

1% = 10,000 ppm

0.001% = 10 ppm

0.0005% = 5 ppm

0.0001% = 1 ppm

Oxygen control is important because oxygen can combine with copper to form copper oxides within the material.

Under certain processing or service conditions, copper oxide can contribute to hydrogen-related embrittlement. This is one reason oxygen-free copper is selected for demanding applications.

C10100 vs. C10200: Are They the Same?

C10100 and C10200 are both oxygen-free copper grades, but their composition requirements are different.

Although these grades are similar in appearance and are both classified as oxygen-free copper, C10200 should not automatically be treated as a direct substitute for C10100.

If a component specification requires C10100, changing to C10200 should be discussed and approved before production.

For buyers comparing different oxygen-free copper grades, the key is to evaluate the actual chemical composition, oxygen limit, conductivity requirement, and intended application together.

C10100 and C10200 Oxygen-Free Copper Comparison

For high-purity copper, chemical composition testing is necessary to verify whether the material meets its specified grade.

A visual inspection cannot establish copper purity. A copper sheet may have a clean, bright surface and still contain chemical elements outside the required limits.

The following analytical methods are commonly used in metal composition testing.

ICP-OES Testing

ICP-OES stands for Inductively Coupled Plasma Optical Emission Spectrometry.

It is widely used for determining the concentrations of various metallic elements in a sample.

During testing:

A representative copper sample is prepared and dissolved.

The solution is introduced into a high-temperature plasma.

Different elements emit light at characteristic wavelengths.

The instrument measures the emission intensity.

The results are calculated and reported as elemental concentrations.

ICP-OES is useful for checking multiple impurity elements in copper.

However, the instrument's detection and quantification limits must be suitable for the required concentration range. Not every ICP-OES setup can reliably measure all impurities at the very low ppm levels relevant to C10100.

ICP-MS Testing

ICP-MS stands for Inductively Coupled Plasma Mass Spectrometry.

It is particularly useful when very low concentrations of trace elements need to be analyzed.

Compared with conventional ICP-OES, ICP-MS generally offers greater sensitivity for many trace elements.

For high-purity copper, this can be valuable when buyers need to verify extremely low impurity levels.

The laboratory must still select an appropriate sample preparation procedure, calibration method, and interference correction.

GDMS Testing

GDMS, or Glow Discharge Mass Spectrometry, is another analytical method used for high-purity materials.

It can analyze a broad range of trace elements and is particularly useful for evaluating the overall impurity profile of high-purity metals.

For applications with strict purity requirements, GDMS may provide additional information beyond routine chemical composition testing.

What Should Buyers Look for in a Chemical Analysis Report?

When reviewing a C10100 chemical analysis report, pay attention to:

The material grade and sample identification.

The measured copper content and its calculation basis.

Individual impurity element concentrations.

The units used, such as wt.%, ppm, or mg/kg.

The detection or reporting limits for relevant elements.

The testing laboratory and report date.

The relationship between the tested sample and the supplied material batch.

A report showing only "Cu ≥ 99.99%" provides less information than a report showing the individual impurity results and their applicable limits.

For demanding applications, buyers can specify which trace elements must be reported and whether independent laboratory testing is required.

Chemical Composition Analysis of High-Purity Copper

Oxygen content is one of the most important characteristics of oxygen-free copper. However, it cannot be accurately verified by visual inspection or ordinary surface testing.

Inert Gas Fusion Method

The inert gas fusion method is a recognized technique for determining oxygen in copper and copper alloys.

ASTM E2575 covers the determination of oxygen in copper and copper alloys using inert gas fusion.

The basic testing process is as follows:

A representative sample is taken from the copper material.

The sample is placed in a graphite crucible.

The testing system heats the sample under an inert gas atmosphere.

Oxygen in the sample reacts with carbon to form carbon monoxide and/or carbon dioxide.

The released gas is measured by the analyzer.

The instrument calculates and reports the oxygen concentration.

The result is usually expressed in ppm or weight percent.

For example:

For C10100, the commonly referenced maximum oxygen content is 5 ppm.

Why Is the Testing Method Important?

When buyers request oxygen content below a specific ppm value, the testing method and laboratory capability should be considered together.

ASTM E2575-19 specifies an applicable measurement range starting at 0.00035 wt.%, equivalent to 3.5 ppm.

This means that when verifying a 5 ppm maximum requirement, buyers should confirm that the laboratory's method, equipment, calibration, and reporting capability are suitable for measurements near the acceptance limit.

A result reported as "less than 10 ppm" does not establish compliance with a 5 ppm maximum.

Similarly, a certificate stating "oxygen-free copper" without an actual oxygen test result does not provide the same level of evidence as a documented quantitative measurement.

What Should an Oxygen Test Report Include?

A useful oxygen analysis report should identify:

Material grade: C10100.

Sample or batch identification.

Oxygen test result.

Measurement unit.

Test method.

Testing date.

Laboratory identification.

Applicable acceptance limit.

For critical applications, buyers should request a documented oxygen result rather than relying solely on a general material description.

Oxygen Content Testing of Copper by Inert Gas Fusion

Electrical conductivity is another important property of C10100 copper.

What Is IACS?

IACS stands for International Annealed Copper Standard.

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

The conductivity of standard annealed copper is defined as 100% IACS at 20°C.

According to published Copper Development Association data, C10100 has a minimum electrical conductivity of 101% IACS in the annealed condition.

This is one of the reasons C10100 is selected for applications requiring high electrical performance.

How Is Electrical Conductivity Tested?

Electrical conductivity can be measured using suitable conductivity testing equipment.

Common approaches include:

Eddy-current conductivity testing.

Electrical resistivity measurement.

Four-terminal resistance measurement, where appropriate for the sample geometry.

The test method should be suitable for the material thickness, sample dimensions, and required accuracy.

Temperature also matters. Since electrical resistance changes with temperature, conductivity results should be reported with the relevant test temperature or corrected reference temperature.

Can Conductivity Prove Copper Purity?

Not by itself.

Although high-purity copper generally has excellent conductivity, electrical conductivity is influenced by several factors:

Chemical composition and impurity elements.

Material temper and cold-working condition.

Annealing treatment.

Testing temperature.

Sample geometry and measurement method.

A copper sample with a conductivity result of 101% IACS cannot automatically be certified as C10100 based on that result alone.

Chemical composition testing verifies the material's composition, oxygen testing verifies oxygen content, and conductivity testing evaluates electrical performance. These tests complement one another but are not interchangeable.

When purchasing C10100 for electrical or electronic applications, it is advisable to specify both the required conductivity and the material composition standard.

Electrical Conductivity Measurement of Copper Sheets

A Mill Test Certificate (MTC) is an important document for verifying the quality and traceability of copper materials.

For C10100 copper sheets and plates, buyers should not only check whether the certificate identifies the correct material grade. They should also verify the actual test results and their relationship to the supplied batch.

Key Information to Check

Check the Applicable Product Standard

UNS C10100 identifies the material grade, but it does not by itself define every requirement for a finished copper sheet or plate.

For copper sheet, strip, plate, and rolled bar, ASTM B152/B152M is an important product specification to consider.

This standard covers various copper grades, including C10100, and addresses requirements related to chemical composition, temper, electrical resistivity, and mechanical properties.

When placing an order, buyers should confirm the specific edition and requirements agreed with the supplier.

Check Batch Traceability

A material certificate should be traceable to the material actually delivered.

For example, if a copper plate is marked with a batch number, that identification should correspond to the batch number on the MTC and relevant inspection records.

Buyers should verify:

Whether the manufacturer and material grade match the purchase order.

Whether the heat or batch number is consistent across the certificate and product identification.

Whether the tested sample represents the supplied batch.

Whether the certificate contains actual results or only general compliance statements.

Whether additional test reports are available for oxygen content and conductivity.

Is a Representative MTC Enough?

A representative MTC can help buyers understand the manufacturer's documentation format and typical test information before ordering.

However, a sample certificate is not proof that a future production batch has passed the same tests.

For an actual shipment, buyers should request the certificate and relevant test results associated with the supplied material.

At our company, we can discuss the required certificate format before production, including material grade, chemical composition, batch identification, and additional inspection requirements. Where oxygen content or conductivity needs to be reported separately, these requirements should be agreed and confirmed before the order is placed.

Request a Sample MTC

Selecting a C10100 supplier requires more than comparing the price per kilogram.

For high-purity copper, the supplier must be able to provide the correct material grade, appropriate product form, reliable documentation, and consistent production quality.

Confirm the Producing Mill

Ask who actually manufactures the copper material.

A supplier may be a manufacturer, a processing company, or a trading company. These business models are not necessarily unsuitable, but buyers should understand where the original copper is produced and where the finished sheets or plates are processed.

Useful information includes:

Producing mill name.

Country of origin.

Processing location, if different.

Material identification and traceability arrangements.

This is especially important when the project requires a specific country of origin or approved manufacturer.

Confirm the Grade and Standard

Do not rely only on a product description such as "99.99% oxygen-free copper."

Confirm the following in writing:

UNS C10100 / OFE.

Applicable product standard, such as ASTM B152/B152M where appropriate.

Required copper purity.

Maximum oxygen content.

Electrical conductivity requirement.

Temper and surface finish.

If a supplier offers an alternative grade, such as C10200, the differences should be clearly identified rather than treating it as an equivalent product without approval.

Confirm the Actual Testing and Certification

Ask which properties are tested and which are simply declared by the manufacturer.

For example:

If the application is particularly demanding, buyers can arrange third-party inspection or independent laboratory testing.

The inspection scope, sampling method, acceptance criteria, and cost should be agreed before production or shipment.

Confirm the Sheet or Plate Specifications

Chemical composition is only one part of a copper sheet purchase.

The finished product must also meet the buyer's dimensional and surface requirements.

Before ordering, specify:

Thickness.

Length and width.

Thickness tolerance.

Length and width tolerance.

Flatness requirements.

Temper.

Surface finish.

Edge condition.

Protective packing requirements.

For precision copper plates, it is useful to define the flatness acceptance method and measurement conditions rather than simply requesting "flat surfaces."

For example, a buyer may require the plate to be checked on a defined reference surface using a specified straightedge or measurement procedure.

The clearer the dimensional and inspection requirements, the easier it is to avoid disputes during material acceptance.

Ask About Processing and Delivery

C10100 copper sheets and plates may require additional processing before delivery.

Depending on the order, suppliers may provide:

Slitting or shearing.

Custom cutting to length and width.

Flattening or leveling.

Surface protection.

Individual sheet separation.

Export packing in wooden cases or other suitable protective packaging.

Buyers should also confirm whether cutting or flattening charges are included in the material price.

For international shipments, the quotation should identify the currency, lead time, payment terms, quotation validity, and agreed Incoterm with the named dispatch location.

Request a C10100 Copper Quotation

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

For buyers looking for C10100 oxygen-free copper, we can discuss sheet and plate supply according to the required material grade, dimensions, temper, surface condition, and inspection requirements.

C10100 Copper Product Range

What We Can Confirm Before Production

To make sure the material is suitable for your application, we can review the following requirements with you:

Material grade and standard: C10100 and the applicable product specification.

Chemical composition: Copper content and specified impurity limits.

Oxygen content: Required maximum value and whether a separate test report is needed.

Electrical conductivity: Required % IACS and testing conditions.

Dimensions: Thickness, length, width, and tolerances.

Temper and surface: Required material condition and finish.

Certification: MTC, batch identification, and agreed additional test reports.

If your project requires strict purity or oxygen limits, please specify them in your inquiry. We can review the requirements and confirm the available material documentation and inspection arrangements before quotation.

C10100 Copper Sheet Cutting and Dimensional Inspection

Packing and Export Delivery of Copper Sheets

Discuss Your C10100 Material Requirements