Copper Alloys•Deoxidized Copper•

VERIFIED(Source-Verified)

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper

Primary Designation:UNS C10300

Aliases:

Oxygen-Free Extra Low PhosphorusOFXLP CopperC10300

Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →

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Data Completeness:2 composition elements and 144 condition-specific property values cataloged.

Omitted fields represent unverified properties. "Missing is better than invented."

Key Engineering Properties

Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.

Density

8.941 g/cm³TYPICAL · at 20 °C

Electrical Conductivity

99 % IACSTYPICAL · at 20 °C

Thermal Conductivity

385.95 W/(m·K)TYPICAL · at 20 °C

Specific Heat Capacity

385.2 J/(kg·K)TYPICAL · at 20 °C

Melting Range (Solidus / Liquidus)

1082.8 – 1082.8 °C1981.0 – 1981.0 °F

Solidus: 1082.8°C | Liquidus: 1082.8°C

Composition Excerpt

Cu ≥ 99.95 wt%Copper (min)

Standard Elemental Basis: MIN

Engineering Summary

UNS C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper is high-purity unalloyed copper deoxidized with 0.001% to 0.005% residual phosphorus. This controlled trace addition ensures complete immunity to hydrogen embrittlement during high-temperature brazing and welding while retaining minimum 99% IACS electrical conductivity and high thermal conductivity.

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Documented Applications

›Applications Requiring Good Brazing: Conductivity (Electrical)
›Applications Requiring Good Brazing: Conductivity (Thermal)
›Applications Requiring Good Weldability: Conductivity (Electrical)
›Applications Requiring Good Weldability: Conductivity (Thermal)
›Applications Requiring Good Weldability: Welding Characteristics
›Applications Requiring High Conductivity: Conductivity (Thermal)
›Billet Mold Tube: Composition
›Billet Mold Tube: Conductivity (Thermal)
›Billet Mold Tube: Corrosion Resistance
›Busbars: Brazing Characteristics
›Busbars: Conductivity (Electrical)
›Busbars: Conductivity (Thermal)

Recognized Aliases

Source-backed commercial trade name and short designations cataloged in canonical data.

Oxygen-Free Extra Low PhosphorusOFXLP CopperC10300

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Specifications & Designations

Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.

Direct Standard DesignationsDIRECT DESIGNATION

2 Primary Identifiers

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System	Identifier	Standard System Name	Classification Notes & Provenance
UNSPRIMARY	C10300	Unified Numbering System	Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C10300)
CDA	Alloy 103	Copper Development Association Alloy Number	CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C10300)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

4 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
Oxygen-Free Extra Low Phosphorus Copper	Standard Commercial Name	CDA Standard Commercial Name
Oxygen-Free Extra Low Phosphorus	Commercial Alias	Colloquial or commercial industry synonym
OFXLP Copper	Commercial Alias	Colloquial or commercial industry synonym
C10300	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

12 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM B577	Detection of Cuperous Oxide (Hydrogen Embrittlement Susceptibility) in Copper	Specification Reference
ASTM	ASTM B224	Standard Classification of Coppers	Specification Reference
MILITARY	MILITARY MIL-B-20292	BLANKS, ROTATING BAND, FOR PROJECTILES	Specification Reference
ASTM	ASTM B152/B152M	COPPER SHEET, STRIP, PLATE AND ROLLED BAR	Specification Reference
ASTM	ASTM B187/B187M	COPPER BUS BAR, ROD AND SHAPES AND GENERAL PURPOSE ROD, BAR AND SHAPES	Specification Reference
FEDERAL	FEDERAL QQ-B-650	BRAZING ALLOY, COPPER, COPPER-ZINC, AND COPPER-PHOSPHORUS	Specification Reference
ASME	ASME SB187	COPPER BUS BAR, ROD AND SHAPES AND GENERAL PURPOSE ROD, BAR AND SHAPES	Specification Reference
ASME	ASME SB359	COPPER & COPPER ALLOY SEAMLESS CONDENSER & HEAT EXCHANGER TUBES WITH INTEGRAL FINS	Specification Reference
ASTM	ASTM B687	BRASS, COPPER AND CHROMIUM PLATED PIPE NIPPLES	Specification Reference
ASTM	ASTM B698	COPPER, COPPER ALLOY PLUMBING PIPE AND TUBE	Specification Reference
ASTM	ASTM B302	THREADLESS COPPER PIPE	Specification Reference
ASTM	ASTM B42	SEAMLESS COPPER PIPE, STANDARD SIZES	Specification Reference

Engineering Notice: Applicable specifications establish manufacturing requirements, dimensional tolerances, and test criteria for specific product forms (e.g. bus bar, wire, plate, pipe). They represent applicable technical standards, not alternative or equivalent alloy grades.

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Chemical Composition

Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).

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Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Copper	Cu	29	MINIMUM	≥ 99.95	wt%	CDA chemical composition specification limits for C10300: min 99.95 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Phosphorus	P	15	RANGE	0.00 – 0.01	wt%	CDA chemical composition specification limits for C10300: 0.001 - 0.005 wt%.Ref: Copper Development Association (CDA)	VERIFIED

* Elemental percentages are expressed in weight percent (wt%). Values represent applicable specification limits. Unspecified trace elements are not fabricated or assumed.Preserves exact semantic basis

Property Display UnitsSwitch between Canonical SI and Source / US Customary units:

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Physical Properties

Source-specific physical properties. Test temperatures are shown only where reported.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Density	8.941 g/cm³	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Density 0.323 lb/cu in. at 68°F (8.941 g/cm³ at 20°C)	0.323 lb/cu in. at 68°F	Copper Development Association Inc.	VERIFIED

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Thermal & Thermodynamic Properties

Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.

9 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Liquidus Temperature	1082.8 °C	TYPICAL	CDA Physical Properties: Liquidus temperature 1981.0 °F (1082.8 °C)	1981.0 °F	Copper Development Association Inc.	VERIFIED
Solidus Temperature	1082.8 °C	TYPICAL	CDA Physical Properties: Solidus temperature 1981.0 °F (1082.8 °C)	1981.0 °F	Copper Development Association Inc.	VERIFIED
Thermal Conductivity	385.95 W/(m·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Thermal conductivity 223.0 Btu/(ft·hr·°F) (385.95 W/(m·K) at 20°C)	223.0 Btu/ sq ft/ ft hr/ °F at 68°F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	16.92 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.4 µin/(in·°F) (16.92 µm/(m·K)) over range 68-21210°F	9.4 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.28 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.6 µin/(in·°F) (17.28 µm/(m·K)) over range 68-39210°F	9.6 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.64 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.8 µin/(in·°F) (17.64 µm/(m·K)) over range 68-57210°F	9.8 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Specific Heat Capacity	385.2 J/(kg·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Specific heat 0.092 Btu/(lb·°F) (385.2 J/(kg·K))	0.092 Btu/ lb /°F at 68°F	Copper Development Association Inc.	VERIFIED
Annealing Temperature Range	371.1 – 648.9 °C	RANGE	CDA Thermal Treatments: Annealing temperature range 700 - 1200°F (371.1 - 648.9°C)	700 – 1200 °F	Copper Development Association Inc.	VERIFIED
Hot Working Temperature Range	760 – 871.1 °C	RANGE	CDA Thermal Treatments: Hot working range 1400 - 1600°F (760.0 - 871.1°C)	1400 – 1600 °F	Copper Development Association Inc.	VERIFIED

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical Conductivity	99 % IACS	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Volume conductivity 99.0 % IACS at 68°F (20°C)	99.0 % IACS at 68°F	Copper Development Association Inc.	VERIFIED

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Mechanical Properties

Contextual Mechanical Properties & Tempers: Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.

Elastic & Baseline Mechanical ConstantsSource-specific measurement conditions

Modulus of Elasticity (Tension)

117.2 GPa

CDA Physical Properties: Elastic modulus in tension 17000.0 ksi (117.2 GPa)

Modulus of Rigidity

44126.4 MPa

CDA Physical Properties: Shear modulus 6400.0 ksi (44126.4 MPa)

Machinability Rating

20 %

CDA Fabrication Properties: Rating relative to Free-Cutting Brass (C36000 = 100%).

Forgeability Rating

65 —

CDA Fabrication Properties: Relative forgeability rating.

Product Form:

Temper / Condition:

Showing 39 of 39 conditions

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Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Flat Products	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 289.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 248.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 14 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H02	0.04	289.6 MPa	248.2 MPa	14 %	—	—	—	VERIFIED
Flat Products	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 40 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 84 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 50 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 89.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H02	0.04	—	—	—	179.3 MPa	89.6 MPa	40 HRB84 HRF50 HR30T	VERIFIED
Flat Products	1/4 Hard (H01) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 206.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 25 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H01	0.04	262 MPa	206.8 MPa	25 %	—	—	—	VERIFIED
Flat Products	1/4 Hard (H01) Source values and qualifiers Rockwell B Hardness: 25 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 70 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 36 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 172.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H01	0.04	—	—	—	172.4 MPa	—	25 HRB70 HRF36 HR30T	VERIFIED
Flat Products	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile Strength: 248.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 193.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 30 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H00	0.04	248.2 MPa	193.1 MPa	30 %	—	—	—	VERIFIED
Flat Products	1/8 Hard (H00) Source values and qualifiers Rockwell B Hardness: 10 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 60 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 25 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 172.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H00	0.04	—	—	—	172.4 MPa	—	10 HRB60 HRF25 HR30T	VERIFIED
Flat Products	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile Strength: 248.2 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 193.1 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 40 % (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — H00	0.25	248.2 MPa	193.1 MPa	40 %	—	—	—	VERIFIED
Flat Products	1/8 Hard (H00) Source values and qualifiers Rockwell B Hardness: 10 HRB (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell F Hardness: 60 HRF (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Shear Strength: 172.4 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — H00	0.25	—	—	—	172.4 MPa	—	10 HRB60 HRF	VERIFIED
Flat Products	As Hot Rolled (M20) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — M20	0.25	220.6 MPa	68.9 MPa	50 %	—	—	—	VERIFIED
Flat Products	As Hot Rolled (M20) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Shear Strength: 151.7 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — M20	0.25	—	—	—	151.7 MPa	—	40 HRF	VERIFIED
Flat Products	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 310.3 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Tensile Strength: 310.3 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — H04	1	310.3 MPa	275.8 MPa	20 %	—	—	—	VERIFIED
Flat Products	Hard (H04) Source values and qualifiers Rockwell B Hardness: 45 HRB (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Rockwell F Hardness: 85 HRF (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — H04	1	—	—	—	179.3 MPa	—	45 HRB85 HRF	VERIFIED
Flat Products	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 344.7 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 310.3 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 12 % (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	344.7 MPa	310.3 MPa	12 %	—	—	—	VERIFIED
Flat Products	Hard (H04) Source values and qualifiers Rockwell B Hardness: 50 HRB (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell F Hardness: 90 HRF (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Shear Strength: 193.1 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	—	—	—	193.1 MPa	—	50 HRB90 HRF	VERIFIED
Flat Products	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 344.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 310.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 6 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — H04	0.04	344.7 MPa	310.3 MPa	6 %	—	—	—	VERIFIED
Flat Products	Hard (H04) Source values and qualifiers Rockwell B Hardness: 50 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell F Hardness: 90 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 57 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 193.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 89.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H04	0.04	—	—	—	193.1 MPa	89.6 MPa	50 HRB90 HRF57 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.025 mm (OS025) · 20 °C Source values and qualifiers Tensile Strength: 234.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 75.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 45 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS025	0.04	234.4 MPa	75.8 MPa	45 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.025 mm (OS025) Source values and qualifiers Rockwell F Hardness: 45 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 158.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 75.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — OS025	0.04	—	—	—	158.6 MPa	75.8 MPa	45 HRF	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 0.25; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — OS050	0.25	220.6 MPa	68.9 MPa	50 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 0.25; Section Size: 0.25 inCopper Development Association (CDA) — OS050	0.25	—	—	—	—	—	40 HRF	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 45 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS050	0.04	220.6 MPa	68.9 MPa	45 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 151.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — OS050	0.04	—	—	—	151.7 MPa	—	40 HRF	VERIFIED
Pipe	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 344.7 MPa (TYPICAL)Cold Work: 30%Copper Development Association (CDA) — Yield Strength (0.5% Ext): 310.3 MPa (TYPICAL)Cold Work: 30%; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 10 % (TYPICAL)Cold Work: 30%Copper Development Association (CDA) — H04	—	344.7 MPa	310.3 MPa	10 %	—	—	—	VERIFIED
Pipe	Hard (H04) Source values and qualifiers Rockwell B Hardness: 50 HRB (TYPICAL)Cold Work: 30%Copper Development Association (CDA) — Rockwell F Hardness: 90 HRF (TYPICAL)Cold Work: 30%Copper Development Association (CDA) — Shear Strength: 193.1 MPa (TYPICAL)Cold Work: 30%Copper Development Association (CDA) — H04	—	—	—	—	193.1 MPa	—	50 HRB90 HRF	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 330.9 MPa (TYPICAL)Section Size: 0.25; Cold Work: 35%; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 303.4 MPa (TYPICAL)Section Size: 0.25; Cold Work: 35%; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 16 % (TYPICAL)Section Size: 0.25; Cold Work: 35%; Section Size: 0.25 inCopper Development Association (CDA) — Tensile Strength: 379.2 MPa (TYPICAL)Section Size: 0.25; Cold Work: 40%; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 344.7 MPa (TYPICAL)Section Size: 0.25; Cold Work: 40%; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.25; Cold Work: 40%; Section Size: 0.25 inCopper Development Association (CDA) — Tensile Strength: 310.3 MPa (TYPICAL)Section Size: 0.25; Cold Work: 16%; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.25; Cold Work: 16%; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.25; Cold Work: 16%; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	310.3 MPa	275.8 MPa	20 %	—	—	—	VERIFIED
Rod	Hard (H04) Source values and qualifiers Rockwell B Hardness: 47 HRB (TYPICAL)Section Size: 0.25; Cold Work: 35%; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell F Hardness: 87 HRF (TYPICAL)Section Size: 0.25; Cold Work: 35%; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell B Hardness: 60 HRB (TYPICAL)Section Size: 0.25; Cold Work: 40%; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell F Hardness: 94 HRF (TYPICAL)Section Size: 0.25; Cold Work: 40%; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell B Hardness: 45 HRB (TYPICAL)Section Size: 0.25; Cold Work: 16%; Section Size: 0.25 inCopper Development Association (CDA) — Rockwell F Hardness: 85 HRF (TYPICAL)Section Size: 0.25; Cold Work: 16%; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	—	—	—	—	—	47 HRB87 HRF60 HRB94 HRF45 HRB85 HRF	VERIFIED
Shapes	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 275.8 MPa (TYPICAL)Section Size: 0.5; Cold Work: 15%; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 220.6 MPa (TYPICAL)Section Size: 0.5; Cold Work: 15%; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 30 % (TYPICAL)Section Size: 0.5; Cold Work: 15%; Section Size: 0.5 inCopper Development Association (CDA) — H04	0.5	275.8 MPa	220.6 MPa	30 %	—	—	—	VERIFIED
Shapes	Hard (H04) Source values and qualifiers Rockwell B Hardness: 35 HRB (TYPICAL)Section Size: 0.5; Cold Work: 15%; Section Size: 0.5 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 0.5; Cold Work: 15%; Section Size: 0.5 inCopper Development Association (CDA) — H04	0.5	—	—	—	179.3 MPa	—	35 HRB	VERIFIED
Shapes	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — OS050	0.5	220.6 MPa	68.9 MPa	50 %	—	—	—	VERIFIED
Shapes	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Shear Strength: 151.7 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — OS050	0.5	—	—	—	151.7 MPa	—	40 HRF	VERIFIED
Tube	Hard Drawn (H80) · 20 °C Source values and qualifiers Tensile Strength: 379.2 MPa (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 344.7 MPa (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — H80	0.065	379.2 MPa	344.7 MPa	8 %	—	—	—	VERIFIED
Tube	Hard Drawn (H80) Source values and qualifiers Rockwell B Hardness: 60 HRB (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — Rockwell F Hardness: 95 HRF (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — Rockwell 30T Hardness: 63 HR30T (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — Shear Strength: 199.9 MPa (TYPICAL)Section Size: 0.065; Cold Work: 40%; Section Size: 0.065 inCopper Development Association (CDA) — H80	0.065	—	—	—	199.9 MPa	—	60 HRB95 HRF63 HR30T	VERIFIED
Tube	Hard Drawn (H80) · 20 °C Source values and qualifiers Tensile Strength: 379.2 MPa (TYPICAL)Section Size: 0.20; Cold Work: 40%; Section Size: 0.20 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 344.7 MPa (TYPICAL)Section Size: 0.20; Cold Work: 40%; Section Size: 0.20 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.20; Cold Work: 40%; Section Size: 0.20 inCopper Development Association (CDA) — H80	0.20	379.2 MPa	344.7 MPa	20 %	—	—	—	VERIFIED
Tube	Light Drawn, Light Cold Rolled (H55) · 20 °C Source values and qualifiers Tensile Strength: 275.8 MPa (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 220.6 MPa (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 25 % (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — H55	0.065	275.8 MPa	220.6 MPa	25 %	—	—	—	VERIFIED
Tube	Light Drawn, Light Cold Rolled (H55) Source values and qualifiers Rockwell B Hardness: 35 HRB (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — Rockwell F Hardness: 77 HRF (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — Rockwell 30T Hardness: 45 HR30T (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — H55	0.065	—	—	—	179.3 MPa	—	35 HRB77 HRF45 HR30T	VERIFIED
Tube	Nominal Grain Size 0.025 mm (OS025) · 20 °C Source values and qualifiers Tensile Strength: 234.4 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 75.8 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 45 % (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS025	0.065	234.4 MPa	75.8 MPa	45 %	—	—	—	VERIFIED
Tube	Nominal Grain Size 0.025 mm (OS025) Source values and qualifiers Rockwell F Hardness: 45 HRF (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — Shear Strength: 158.6 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS025	0.065	—	—	—	158.6 MPa	—	45 HRF	VERIFIED
Tube	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 45 % (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS050	0.065	220.6 MPa	68.9 MPa	45 %	—	—	—	VERIFIED
Tube	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — Shear Strength: 151.7 MPa (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS050	0.065	—	—	—	151.7 MPa	—	40 HRF	VERIFIED

Hardness Integrity Notice: Rockwell B (HRB), Rockwell F (HRF), and Superficial 30T (HR30T) scales are reported on their measured scales without cross-scale mathematical conversion.

Source: See fact-level citations

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Processing & Fabrication

Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.

Source: Copper Development Association (CDA)

Machinability

Machinability rating: 20% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 65.

Weldability & Joining

Soldering: Excellent; Brazing: Excellent; Oxyacetylene Welding: Fair; Gas Shielded Arc Welding: Excellent; Coated Metal Arc Welding: Not Recommended; Spot Weld: Not Recommended; Seam Weld: Not Recommended; Butt Weld: Good

Heat Treatment & Working Ranges

Annealing temperature range: 371.1°C to 648.9°C (700°F - 1200°F). Hot working temperature range: 760.0°C to 871.1°C (1400°F - 1600°F).

Forming & Cold Working

Capacity for Being Cold Worked: Excellent. Capacity for Being Hot Formed: Excellent.

Practical Engineering & Fabrication Notes

By Mat Grades Editorial Desk · Updated 2026-11-14. Use alongside the specified product standard and supplier certificate.

Machining & shop-floor behavior

The cataloged machining note for C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper states: Machinability rating: 20% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 65. A relevant hardness example is Rockwell B Hardness: 40 HRB (typical; 1/2 Hard (H02), H02, Flat Products, 0.04). Use that supplied condition for a trial of the difficult feature. Record tool changes, burr removal, unclamped dimensions and accepted parts per hour. Relative machinability ratings from different reference scales should not be compared as if they were one common test.

Weldability, brazing & joining

The available joining assessment states: Soldering: Excellent; Brazing: Excellent; Oxyacetylene Welding: Fair; Gas Shielded Arc Welding: Excellent; Coated Metal Arc Welding: Not Recommended; Spot Weld: Not Recommended; Seam Weld: Not Recommended; Butt Weld: Good The first cataloged strength example is Tensile Strength: 289.6 MPa (typical; 1/2 Hard (H02), H02, Flat Products, 0.04; test temperature 20 °C). Assess the final part after joining or thermal processing. Include distortion, cleanup and inspection in the quotation. A material designation or favorable process rating is a starting point for qualification, not evidence that an untested joint meets the drawing.

Corrosion & service environment

Review the working fluid, cleaning agents and dissimilar-metal contacts as separate exposures. The word copper, brass or bronze is too broad to establish compatibility. A process rating does not qualify a pressure boundary, and a thermal-property measurement does not establish a continuous service-temperature limit. The recorded thermal example is Thermal Conductivity: 385.95 W/(m·K) (typical; ; test temperature 20 °C). State the exposure and inspection access in the design record so that a change of installation or cleaning method triggers a review. The selected composition entries are Cu minimum 99.95 wt%, P 0.001–0.005 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use UNS C10300, COMMERCIAL Oxygen-Free Extra Low Phosphorus Copper, CDA Alloy 103 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Applications Requiring Good Brazing: Conductivity (Electrical) as an application example. The related candidate C10200 Oxygen-Free (OF) Copper is linked for comparison; its nearest alternative relationship must be checked before substitution. Compare the complete route through machining, joining, finish and inspection. Keep the certificate, required test location and acceptance criteria with the first-article record. A later change of grade, condition or source should be assessed against that same requirement.

Technical references: Copper Development Association (CDA); Copper Development Association (CDA)

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status
C10200 Oxygen-Free (OF) Copper	Copper Alloys	Nearest Alternative	C10300 (OFXLP) contains 0.001-0.005% P deoxidizer, retaining 99% IACS conductivity with complete immunity to hydrogen embrittlement. C10200 is unalloyed oxygen-free copper (100% IACS) without phosphorus.Design parameters (weldability, hardenability, fatigue limit) must be re-evaluated for the specific application.	VERIFIED
C12000 DLP Copper	Copper Alloys	Nearest Alternative	C10300 has extra low phosphorus (0.001-0.005%) for 99% IACS conductivity, whereas C12000 has 0.004-0.012% P for 98% IACS conductivity.Design parameters (weldability, hardenability, fatigue limit) must be re-evaluated for the specific application.	VERIFIED
C11000 ETP Copper	Copper Alloys	Nearest Alternative	C10300 is deoxidized with phosphorus, enabling reliable brazing in reducing atmospheres without hydrogen embrittlement, at 99% IACS conductivity vs 101% for C11000.Design parameters (weldability, hardenability, fatigue limit) must be re-evaluated for the specific application.	VERIFIED

Deoxidized Copper Alloy Family

Copper alloys sharing common alloying formulations and metallurgical classifications under the Deoxidized Copper branch.

3 Adjacent Grades

C10300Current Grade

C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper

C12000

C12200

Sources

Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.

Copper Development Association Inc.CDA Alloy C10300 Property & Specification Profile

AUTHORITATIVE BODY

Copper Development Association authoritative technical reference profile for C10300 Oxygen-Free Extra Low Phosphorus (OFXLP) Copper.

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Copper Development Association Inc.CDA UNS Standard Designations Register (C10300)

AUTHORITATIVE BODY

Unified Numbering System (UNS) designation registration register confirming active C10300 status.

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Intellectual Property & Provenance Notice: Mat Grades cites technical literature from recognized industry associations and standards organizations. Underlying technical standards and publication data remain the intellectual property of their respective issuing organizations.