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C10700 (UNS C10700) Oxygen-Free Silver-Bearing Copper is a high-purity, high-conductivity copper alloy renowned for its exceptional resistance to softening at elevated temperatures. This unique property, achieved through a precise micro-addition of silver (Ag) to an oxygen-free copper base, allows it to retain cold-worked strength and hardness in high-heat environments where standard coppers would anneal and weaken. With a conductivity rating of 100% IACS and excellent ductility, C10700 is the critical material choice for high-temperature electrical conductors, resistance welding electrodes, vacuum interrupter contacts, and semiconductor manufacturing components, ensuring reliability and performance under thermal stress.
Typical Applications：
C10700 is primarily used in applications that demand a combination of extremely high electrical/thermal conductivity and the ability to retain mechanical strength at elevated temperatures.
High-Temperature Wires and Cables: Used as core conductors and leads for high-current applications, particularly in motors, generators, and transformers where operational heat generation can cause softening. C10700 resists deformation under these conditions.
Vacuum Tube and Microwave Tube Components: Its oxygen-free nature and high-temperature strength are critical for integrity in high-vacuum environments.
Semiconductor Manufacturing Equipment: Ideal for components requiring high thermal conductivity and dimensional stability through thermal cycling.
Resistance Welding Electrodes: Especially for welding coated steels, where its elevated temperature performance surpasses that of chromium zirconium copper (CuCrZr), resulting in longer service life.
High-Temperature Heat Sinks and Cold Plates.
Stabilizers and Structural Support Materials for Superconducting Magnets.
Comparison with Similar Materials：
vs. C10100 / C10200 (Standard Oxygen-Free Copper): C10700 offers significantly superior resistance to softening at high temperatures, though at a slightly higher cost.
vs. C11000 (Electrolytic Tough Pitch Copper): C10700 eliminates the risk of hydrogen embrittlement and offers far greater purity and high-temperature performance than C11000.
vs. C14500 (Tellurium Copper): C14500 is known for its excellent machinability, whereas C10700 is engineered for high-temperature strength and conductivity.
vs. C15000 (Zirconium Copper): Both alloys possess excellent high-temperature properties. However, C15000 generally offers higher strength, while C10700 provides slightly better electrical conductivity.
Chemical Composition
| Elements | |||
| Cu(1,2,3) | Ag(4) | O | |
| Min (%) | 99.95 | 0.085 | 0.001 |
| Max (%) | |||
(1) Cu value includes Ag.
(2) Cu is determined by the difference between the impurity total and 100%.
(3) This is a high conductivity copper which has, in the annealed condition a minimum conductivity of 100% IACS except for Alloy C10100 which has a minimum conductivity of 101% IACS.
(4) Ag 0.085% min is the equivelant of, Ag 25 Troy Oz min.
Mechanical Properties
| Form | Temper | Temper Code | Tensile Strength (ksi) |
YS-0.5% Ext (ksi) |
Elongation (%) |
Rockwell B scale | Rockwell F scale | Rockwell 30T scale | Shear Strength (ksi) |
Section Size (in) |
Cold Work (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| * Measured at room temperature, 68°F (20°C). | |||||||||||
| Flat Products | 1/2 Hard | H02 | 42 Typ | 36 Typ | 14 Typ | 40 Typ | 84 Typ | 50 Typ | 26 Typ | 0.04 | |
| 1/4 Hard | H01 | 38 Typ | 30 Typ | 35 Typ | 25 Typ | 70 Typ | 25 Typ | 0.25 | |||
| 1/4 Hard | H01 | 38 Typ | 30 Typ | 25 Typ | 25 Typ | 70 Typ | 36 Typ | 25 Typ | 0.04 | ||
| 1/8 Hard | H00 | 36 Typ | 28 Typ | 40 Typ | 10 Typ | 60 Typ | 25 Typ | 0.25 | |||
| 1/8 Hard | H00 | 36 Typ | 28 Typ | 30 Typ | 10 Typ | 60 Typ | 25 Typ | 25 Typ | 0.04 | ||
| As Hot Rolled | M20 | 34 Typ | 10 Typ | 45 Typ | 45 Typ | 23 Typ | 0.04 | ||||
| As Hot Rolled | M20 | 32 Typ | 10 Typ | 50 Typ | 40 Typ | 22 Typ | 0.25 | ||||
| Extra Spring | H10 | 57 Typ | 53 Typ | 4 Typ | 62 Typ | 95 Typ | 64 Typ | 29 Typ | 0.04 | ||
| Hard | H04 | 50 Typ | 45 Typ | 12 Typ | 50 Typ | 90 Typ | 28 Typ | 0.25 | |||
| Hard | H04 | 45 Typ | 40 Typ | 20 Typ | 45 Typ | 85 Typ | 26 Typ | 1 | |||
| Hard | H04 | 50 Typ | 45 Typ | 6 Typ | 50 Typ | 90 Typ | 57 Typ | 28 Typ | 0.04 | ||
| Nominal Grain Size 0.025 mm | OS025 | 34 Typ | 11 Typ | 45 Typ | 45 Typ | 23 Typ | 0.04 | ||||
| Nominal Grain Size 0.050 mm | OS050 | 32 Typ | 10 Typ | 50 Typ | 40 Typ | 22 Typ | 0.25 | ||||
| Spring | H08 | 55 Typ | 50 Typ | 4 Typ | 60 Typ | 94 Typ | 63 Typ | 29 Typ | 0.04 | ||
| Rod | As Hot Rolled | M20 | 32 Typ | 10 Typ | 55 Typ | 40 Typ | 22 Typ | 1 | |||
| Hard | H04 | 45 Typ | 40 Typ | 20 Typ | 45 Typ | 85 Typ | 26 Typ | 2 | 16 | ||
| Hard | H04 | 48 Typ | 44 Typ | 16 Typ | 47 Typ | 87 Typ | 27 Typ | 1 | 35 | ||
| Hard | H04 | 55 Typ | 50 Typ | 10 Typ | 60 Typ | 94 Typ | 29 Typ | 0.25 | 40 | ||
| Nominal Grain Size 0.050 mm | OS050 | 32 Typ | 10 Typ | 55 Typ | 40 Typ | 22 Typ | 1 | ||||
| Shapes | As Hot Extruded | M30 | 32 Typ | 10 Typ | 50 Typ | 40 Typ | 22 Typ | 0.5 | |||
| As Hot Rolled | M20 | 32 Typ | 10 Typ | 50 Typ | 40 Typ | 22 Typ | 0.5 | ||||
| Hard | H04 | 40 Typ | 32 Typ | 30 Typ | 35 Typ | 26 Typ | 0.5 | 15 | |||
| Nominal Grain Size 0.050 mm | OS050 | 32 Typ | 10 Typ | 50 Typ | 40 Typ | 22 Typ | 0.5 | ||||
| Tube | Hard Drawn | H80 | 55 Typ | 50 Typ | 8 Typ | 60 Typ | 95 Typ | 62 Typ | 29 Typ | 0.065 | 40 |
| Light Drawn, Light Cold Rolled | H55 | 40 Typ | 32 Typ | 25 Typ | 35 Typ | 77 Typ | 45 Typ | 26 Typ | 0.065 | 15 | |
| Nominal Grain Size 0.025 mm | OS025 | 34 Typ | 11 Typ | 45 Typ | 45 Typ | 23 Typ | 0.065 | ||||
| Nominal Grain Size 0.050 mm | OS050 | 32 Typ | 10 Typ | 45 Typ | 40 Typ | 22 Typ | 0.065 | ||||
| Wire | Hard | H04 | 55 Typ | 1.5 Typ | 29 Typ | 0.08 | |||||
| Nominal Grain Size 0.050 mm | OS050 | 35 Typ | 35 Typ | 24 Typ | 0.08 | ||||||
| Spring | H08 | 66 Typ | 1.5 Typ | 33 Typ | 0.08 | ||||||
Physical Properties
| Melting Point - Liquidus °F | 1981 |
|---|---|
| Melting Point - Solidus °F | 1981 |
| Density lb/cu in. at 68°F | 0.323 |
| Specific Gravity | 8.94 |
| Electrical Conductivity % IACS at 68°F | 100 (1) |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 224 |
| Coefficient of Thermal Expansion 68-212 10 to -6 power per °F (68 – 212°F) | 9.4 |
| Coefficient of Thermal Expansion 68-392 10 to -6 power per °F (68 – 392°F) | 9.6 |
| Coefficient of Thermal Expansion 68-572 10 to -6 power per °F (68 – 572°F) | 9.8 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.092 |
| Modulus of Elasticity in Tension ksi | 17000 |
| Modulus of Rigidity ksi | 6400 |
Fabrication Properties
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Fair |
| Gas Shielded Arc Welding | Good |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 65 |
| Machinability Rating | 20 |
Common Fabrication Processes
Blanking
Coining
Coppersmithing
Drawing
Etching
Forming and Bending
Heading and Upsetting
Hot Forging and Pressing
Piercing and Punching
Roll Threading and Knurling
Shearing
Spinning
Squeezing and Swaging
Stamping
Thermal Properties
| Treatment | Minimum* | Maximum* | ||
|---|---|---|---|---|
| * Temperature is measured in Fahrenheit. | ||||
| Annealing | 900 | 1400 | ||
| Hot Working Temperature | 1400 | 1600 | ||
Typical uses
| Product Category | Product | Reason Category | Reason |
|---|---|---|---|
| Automotive | Gaskets | Forming Characteristics | Formability |
| Gaskets | Pressure Tight | Pressure Tight | |
| Radiators | Brazing Characteristics | Brazability | |
| Radiators | Conductivity (Thermal) | Thermal Conductivity | |
| Radiators | Corrosion Resistance | Corrosion Resistance | |
| Radiators | Mechanical Properties | Creep Resistance | |
| Radiators | Solderability | Solderability | |
| Electrical | Busbars | Conductivity (Electrical) | Electrical Conductivity |
| Busbars | Conductivity (Thermal) | Thermal Conductivity | |
| Busbars | Corrosion Resistance | Corrosion Resistance | |
| Busbars | Softening Resistance | Resistance to Thermal Softening vs. C10500 | |
| Busbars | Solderability | Solderability | |
| Busbars | Welding Characteristics | Weldability | |
| Commutator Segments | Conductivity (Electrical) | Electrical Conductivity | |
| Commutator Segments | Conductivity (Thermal) | Thermal Conductivity | |
| Commutator Segments | Corrosion Resistance | Corrosion Resistance | |
| Commutator Segments | Softening Resistance | Resistance to Thermal Softening vs. C10500 | |
| Commutator Segments | Solderability | Solderability | |
| Commutator Segments | Welding Characteristics | Weldability | |
| Conductivity Wire | Conductivity (Electrical) | Electrical Conductivity | |
| Conductivity Wire | Conductivity (Thermal) | Thermal Conductivity | |
| Conductivity Wire | Corrosion Resistance | Corrosion Resistance | |
| Conductors | Conductivity (Electrical) | Electrical Conductivity | |
| Conductors | Conductivity (Thermal) | Thermal Conductivity | |
| Conductors | Corrosion Resistance | Corrosion Resistance | |
| Conductors | Softening Resistance | Resistance to Thermal Softening vs. C10500 | |
| Conductors | Solderability | Solderability | |
| Conductors | Welding Characteristics | Weldability | |
| Contacts | Conductivity (Electrical) | Electrical Conductivity | |
| Contacts | Conductivity (Thermal) | Thermal Conductivity | |
| Contacts | Corrosion Resistance | Corrosion Resistance | |
| Contacts | Solderability | Solderability | |
| Printed Circuit Foil | Conductivity (Electrical) | Electrical Conductivity | |
| Printed Circuit Foil | Conductivity (Thermal) | Thermal Conductivity | |
| Printed Circuit Foil | Corrosion Resistance | Corrosion Resistance | |
| Printed Circuit Foil | Forming Characteristics | Formability | |
| Printed Circuit Foil | Solderability | Solderability | |
| Radio Parts | Conductivity (Electrical) | Electrical Conductivity | |
| Radio Parts | Conductivity (Thermal) | Thermal Conductivity | |
| Radio Parts | Corrosion Resistance | Corrosion Resistance | |
| Radio Parts | Solderability | Solderability | |
| Switches | Conductivity (Electrical) | Electrical Conductivity | |
| Switches | Conductivity (Thermal) | Thermal Conductivity | |
| Switches | Corrosion Resistance | Corrosion Resistance | |
| Switches | Solderability | Solderability | |
| Terminal Connectors | Conductivity (Electrical) | Electrical Conductivity | |
| Terminal Connectors | Conductivity (Thermal) | Thermal Conductivity | |
| Terminal Connectors | Corrosion Resistance | Corrosion Resistance | |
| Terminal Connectors | Softening Resistance | Resistance to Thermal Softening vs. C10500 | |
| Terminal Connectors | Solderability | Solderability | |
| Terminal Connectors | Welding Characteristics | Weldability | |
| Transistor Bases | Conductivity (Electrical) | Electrical Conductivity | |
| Transistor Bases | Conductivity (Thermal) | Thermal Conductivity | |
| Transistor Bases | Corrosion Resistance | Corrosion Resistance | |
| Transistor Bases | Softening Resistance | Resistance to Thermal Softening | |
| Windings | Conductivity (Electrical) | Electrical Conductivity | |
| Windings | Conductivity (Thermal) | Thermal Conductivity | |
| Windings | Corrosion Resistance | Corrosion Resistance | |
| Windings | Mechanical Properties | Creep Resistance | |
| Windings | Solderability | Solderability | |
| Industrial | Applications Requiring Brazing in Hydrogen Atmosphere | Conductivity (Thermal) | Thermal Conductivity |
| Applications Requiring Brazing in Hydrogen Atmosphere | Corrosion Resistance | Corrosion Resistance | |
| Applications Requiring Brazing in Hydrogen Atmosphere | Corrosion Resistance | Hydrogen Embrittlement Resistance | |
| Chemical Process Equipment | Conductivity (Thermal) | Thermal Conductivity | |
| Chemical Process Equipment | Corrosion Resistance | Corrosion Resistance | |
| Chemical Process Equipment | Mechanical Properties | Creep Resistance | |
| Clad Metals | Conductivity (Electrical) | Electrical Conductivity | |
| Clad Metals | Corrosion Resistance | Corrosion Resistance | |
| Clad Metals | Mechanical Properties | Very High Strength | |
| Heat Exchangers | Brazing Characteristics | Brazability | |
| Heat Exchangers | Conductivity (Thermal) | Thermal Conductivity | |
| Heat Exchangers | Corrosion Resistance | Corrosion Resistance | |
| Heat Exchangers | Softening Resistance | Resistance to Thermal Softening | |
| Printing Rolls | Corrosion Resistance | Corrosion Resistance | |
| Printing Rolls | Forming Characteristics | Formability |
Applicable Specifications
| Form | Specific Sub-Form | Application | System | Standard | Description |
|---|---|---|---|---|---|
| ASTM | B577 | Detection of Cuperous Oxide (Hydrogen Embrittlement Susceptibility) in Copper | |||
| ASTM | B224 | Standard Classification of Coppers | |||
| Bands | Projectile Rotating | MILITARY | MIL-B-20292 | BLANKS, ROTATING BAND, FOR PROJECTILES | |
| Brazing Filler Metal | FEDERAL | QQ-B-650 | BRAZING ALLOY, COPPER, COPPER-ZINC, AND COPPER-PHOSPHORUS | ||
| Bus Bar, Rod and Shapes, General Purpose, same | ASME | SB187 | COPPER BUS BAR, ROD AND SHAPES AND GENERAL PURPOSE ROD, BAR AND SHAPES | ||
| Bus Bar | ASTM | B187/B187M | COPPER BUS BAR, ROD AND SHAPES AND GENERAL PURPOSE ROD, BAR AND SHAPES | ||
| Pipe | Bus Bar | ASTM | B188 | SEAMLESS COPPER BUS PIPE AND TUBE | |
| Refinery Shapes | ASTM | B170 | OXYGEN-FREE ELECTROLYTIC COPPER-REFINERY SHAPES | ||
| Shapes | Bus Bar | MILITARY | MIL-B-19231 | BARS, COPPER, SILVER BEARING (FOR COMMUTATORS) | |
| Sheet | ASTM | B506 | COPPER CLAD STAINLESS STEEL SHEET AND STRIP FOR BUILDING CONSTRUCTION | ||
| Sheet, Strip, Roller Bar & Plate | ASTM | B152/B152M | COPPER SHEET, STRIP, PLATE AND ROLLED BAR | ||
| ASME | SB152 | COPPER SHEET, STRIP, PLATE, AND ROLLED BAR | |||
| Strip | ASTM | B506 | COPPER CLAD STAINLESS STEEL SHEET AND STRIP FOR BUILDING CONSTRUCTION | ||
| Tube | Bus Bar | ASTM | B188 | SEAMLESS COPPER BUS PIPE AND TUBE | |
| Wire | Soft | ASTM | B3 | SOFT OR ANNEALED COPPER WIRE | |
| ASTM | B298 | SILVER-COATED SOFT OR ANNEALED COPPER WIRE | |||
| Hard Drawn | FEDERAL | QQ-W-343 | WIRE, ELECTRICAL (UNINSULATED) | ||
| Hard Drawn | ASTM | B1 | HARD-DRAWN COPPER WIRE | ||
| Hard Drawn | FEDERAL | QQ-W-343 | WIRE, ELECTRICAL (UNINSULATED) | ||
| ASTM | B189 | LEAD-COATED AND LEAD ALLOY COATED SOFT COPPER WIRE FOR ELECTRICAL PURPOSES | |||
| ASTM | B355 | NICKEL-COATED SOFT OR ANNEALED COPPER WIRE | |||
| Soft | FEDERAL | QQ-W-343 | WIRE, ELECTRICAL (UNINSULATED) | ||
| ASTM | B246 | TINNED HARD-DRAWN AND MEDIUM HARD-DRAWN COPPER WIRE FOR ELECTRICAL PURPOSES | |||
| Hard Drawn | ASTM | B2 | MEDIUM-HARD DRAWN COPPER WIRE | ||
| ASTM | B272 | COPPER FLAT PRODUCTS WITH FINISHED (ROLLED OR DRAWN) EDGES (FLAT WIRE AND STRIP) |
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