Copper Alloys•Free-Machining Copper•

VERIFIED(Source-Verified)

C14500 Tellurium Copper

Primary Designation:UNS C14500

Aliases:

Tellurium CopperFree-Machining Copper 145C14500

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:3 composition elements and 122 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

93 % IACSTYPICAL · at 20 °C

Thermal Conductivity

354.8 W/(m·K)TYPICAL · at 20 °C

Specific Heat Capacity

385.2 J/(kg·K)TYPICAL · at 20 °C

Melting Range (Solidus / Liquidus)

1051.1 – 1080 °C1924.0 – 1976.0 °F

Solidus: 1051.1°C | Liquidus: 1080°C

Composition Excerpt

Cu ≥ 99.9 wt%Copper (min)

Standard Elemental Basis: MIN

Engineering Summary

UNS C14500 Tellurium Copper (99.5% Cu min, 0.40-0.7% Te, 0.004-0.012% P) provides exceptional machinability (85% rating relative to C36000) combined with 93% IACS electrical conductivity and high thermal conductivity. Dispersed copper telluride precipitates act as internal chip-breakers for automated precision turning while preserving hydrogen embrittlement immunity.

C14500 Tellurium Copper Documented Applications

›Architecture: Fire Protection
›Electrical Connectors: Conductivity (Thermal)
›Electrical Connectors: Corrosion Resistance
›Electrical Connectors: Machining Characteristics
›Electrical: Electrical Connectors
›Fire Protection: Corrosion Resistance
›Fire Protection: Machining Characteristics
›Fixtures: Forming Characteristics
›Fixtures: Machining Characteristics
›Forgings: Conductivity (Thermal)
›Forgings: Machining Characteristics
›Forgings: Softening Resistance

Recognized Aliases

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

Tellurium CopperFree-Machining Copper 145C14500

C14500 Tellurium 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	C14500	Unified Numbering System	Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C14500)
CDA	Alloy 145	Copper Development Association Alloy Number	CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C14500)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

3 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
Tellurium Copper	Standard Commercial Name	CDA Standard Commercial Name
Free-Machining Copper 145	Commercial Alias	Colloquial or commercial industry synonym
C14500	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

10 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM B224	Standard Classification of Coppers	Specification Reference
ASTM	ASTM B124/B124M	COPPER AND COPPER-ALLOY FORGING ROD, BAR AND SHAPES	Specification Reference
ASTM	ASTM B301/B301M	FREE-CUTTING COPPER ROD AND BAR	Specification Reference
FEDERAL	FEDERAL QQ-B-650	BRAZING ALLOY, COPPER, COPPER-ZINC, AND COPPER-PHOSPHORUS	Specification Reference
ASTM	ASTM B283/B283M	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)	Specification Reference
ASME	ASME B16.22	WROUGHT COPPER AND COPPER ALLOY SOLDER-JOINT PRESSURE FITTINGS	Specification Reference
ASME	ASME SB283	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)	Specification Reference
SAE	SAE J463	WROUGHT COPPER AND COPPER ALLOYS	Specification Reference
SAE	SAE J461	WROUGHT AND CAST COPPER ALLOYS	Specification Reference
ASTM	ASTM B216	REFINERY SHAPES, TOUGH-PITCH FIRE-REFINED	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.

C14500 Tellurium 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	≥ 99.90	wt%	CDA chemical composition specification limits for C14500: min 99.9 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Phosphorus	P	15	RANGE	0.00 – 0.01	wt%	CDA chemical composition specification limits for C14500: 0.004 - 0.012 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Tellurium	Te	52	RANGE	0.40 – 0.70	wt%	CDA chemical composition specification limits for C14500: 0.4 - 0.7 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:

C14500 Tellurium 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

C14500 Tellurium 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	1080 °C	TYPICAL	CDA Physical Properties: Liquidus temperature 1976.0 °F (1080.0 °C)	1976.0 °F	Copper Development Association Inc.	VERIFIED
Solidus Temperature	1051.1 °C	TYPICAL	CDA Physical Properties: Solidus temperature 1924.0 °F (1051.1 °C)	1924.0 °F	Copper Development Association Inc.	VERIFIED
Thermal Conductivity	354.8 W/(m·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Thermal conductivity 205.0 Btu/(ft·hr·°F) (354.8 W/(m·K) at 20°C)	205.0 Btu/ sq ft/ ft hr/ °F at 68°F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.1 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.5 µin/(in·°F) (17.1 µm/(m·K)) over range 68-21210°F	9.5 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.46 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.7 µin/(in·°F) (17.46 µm/(m·K)) over range 68-39210°F	9.7 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.82 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.9 µin/(in·°F) (17.82 µm/(m·K)) over range 68-57210°F	9.9 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	426.7 – 648.9 °C	RANGE	CDA Thermal Treatments: Annealing temperature range 800 - 1200°F (426.7 - 648.9°C)	800 – 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

C14500 Tellurium 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	93 % IACS	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Volume conductivity 93.0 % IACS at 68°F (20°C)	93.0 % IACS at 68°F	Copper Development Association Inc.	VERIFIED

C14500 Tellurium 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

85 %

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 36 of 36 conditions

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Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: 0.25; Cold Work: 20%; Section Size: 0.25 inCopper Development Association (CDA) — Elongation: 18 % (TYPICAL)Section Size: 0.25; Cold Work: 20%; Section Size: 0.25 inCopper Development Association (CDA) — H02	0.25	262 MPa	—	18 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 43 HRB (TYPICAL)Section Size: 0.25; Cold Work: 20%; Section Size: 0.25 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 0.25; Cold Work: 20%; Section Size: 0.25 inCopper Development Association (CDA) — H02	0.25	—	—	—	179.3 MPa	—	43 HRB	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: .0625; Section Size: .0625 inCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: .0625; Section Size: .0625 inCopper Development Association (CDA) — H02	.0625	262 MPa	—	8 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 289.6 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 25 % (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Tensile Strength: 289.6 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: 25 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — H02	1	289.6 MPa	275.8 MPa	25 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 42 HRB (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 172.4 MPa (TYPICAL)Section Size: 1; Cold Work: 20%; Section Size: 1 inCopper Development Association (CDA) — H02	1	—	—	—	172.4 MPa	—	42 HRB	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: .25; Section Size: .25 inCopper Development Association (CDA) — Elongation: 12 % (TYPICAL)Section Size: .25; Section Size: .25 inCopper Development Association (CDA) — H02	.25	262 MPa	—	12 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 289.6 MPa (TYPICAL)Section Size: 2; Section Size: 2 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 268.9 MPa (TYPICAL)Section Size: 2; Section Size: 2 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 2; Section Size: 2 inCopper Development Association (CDA) — Tensile Strength: 289.6 MPa (TYPICAL)Section Size: 2; Cold Work: 15%; Section Size: 2 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 268.9 MPa (TYPICAL)Section Size: 2; Cold Work: 15%; Section Size: 2 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 2; Cold Work: 15%; Section Size: 2 inCopper Development Association (CDA) — H02	2	289.6 MPa	268.9 MPa	35 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 296.5 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Tensile Strength: 296.5 MPa (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 inCopper Development Association (CDA) — H02	0.5	296.5 MPa	275.8 MPa	20 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 296.5 MPa (TYPICAL)Section Size: 0.24; Section Size: 0.24 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.24; Section Size: 0.24 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 18 % (TYPICAL)Section Size: 0.24; Section Size: 0.24 inCopper Development Association (CDA) — H02	0.24	296.5 MPa	275.8 MPa	18 %	—	—	—	VERIFIED
Rod	1/2 Hard (H02) Source values and qualifiers Shear Strength: 172.4 MPa (TYPICAL)Section Size: 2; Cold Work: 15%; Section Size: 2 inCopper Development Association (CDA) — H02	2	—	—	—	172.4 MPa	—	—	VERIFIED
Rod	1/2 Hard (H02) Source values and qualifiers Rockwell B Hardness: 43 HRB (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 inCopper Development Association (CDA) — Rockwell 30T Hardness: 50 HR30T (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 inCopper Development Association (CDA) — Shear Strength: 179.3 MPa (TYPICAL)Section Size: 0.5; Cold Work: 20%; Section Size: 0.5 inCopper Development Association (CDA) — H02	0.5	—	—	—	179.3 MPa	—	43 HRB50 HR30T	VERIFIED
Rod	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 206.8 MPa (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 26 % (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 inCopper Development Association (CDA) — H00	0.5	262 MPa	206.8 MPa	26 %	—	—	—	VERIFIED
Rod	1/8 Hard (H00) Source values and qualifiers Rockwell B Hardness: 36 HRB (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 inCopper Development Association (CDA) — Rockwell 30T Hardness: 44 HR30T (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 inCopper Development Association (CDA) — Shear Strength: 172.4 MPa (TYPICAL)Section Size: 0.5; Cold Work: 6%; Section Size: 0.5 inCopper Development Association (CDA) — H00	0.5	—	—	—	172.4 MPa	—	36 HRB44 HR30T	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 365.4 MPa (TYPICAL)Section Size: 0.24; Section Size: 0.24 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 337.8 MPa (TYPICAL)Section Size: 0.24; Section Size: 0.24 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 10 % (TYPICAL)Section Size: 0.24; Section Size: 0.24 inCopper Development Association (CDA) — H04	0.24	365.4 MPa	337.8 MPa	10 %	—	—	—	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 330.9 MPa (TYPICAL)Section Size: 0.5; Cold Work: 35%; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 303.4 MPa (TYPICAL)Section Size: 0.5; Cold Work: 35%; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 15 % (TYPICAL)Section Size: 0.5; Cold Work: 35%; Section Size: 0.5 inCopper Development Association (CDA) — Tensile Strength: 330.9 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 303.4 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 15 % (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — H04	0.5	330.9 MPa	303.4 MPa	15 %	—	—	—	VERIFIED
Rod	Hard (H04) Source values and qualifiers Rockwell B Hardness: 48 HRB (TYPICAL)Section Size: 0.5; Cold Work: 35%; Section Size: 0.5 inCopper Development Association (CDA) — Shear Strength: 186.2 MPa (TYPICAL)Section Size: 0.5; Cold Work: 35%; Section Size: 0.5 inCopper Development Association (CDA) — H04	0.5	—	—	—	186.2 MPa	—	48 HRB	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 330.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 303.4 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: 330.9 MPa (TYPICAL)Section Size: 1; Cold Work: 35%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 303.4 MPa (TYPICAL)Section Size: 1; Cold Work: 35%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 1; Cold Work: 35%; Section Size: 1 inCopper Development Association (CDA) — H04	1	330.9 MPa	303.4 MPa	20 %	—	—	—	VERIFIED
Rod	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 365.4 MPa (TYPICAL)Section Size: 0.25; Cold Work: 45%; Section Size: 0.25 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 337.8 MPa (TYPICAL)Section Size: 0.25; Cold Work: 45%; Section Size: 0.25 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 10 % (TYPICAL)Section Size: 0.25; Cold Work: 45%; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	365.4 MPa	337.8 MPa	10 %	—	—	—	VERIFIED
Rod	Hard (H04) Source values and qualifiers Rockwell B Hardness: 54 HRB (TYPICAL)Section Size: 0.25; Cold Work: 45%; Section Size: 0.25 inCopper Development Association (CDA) — Shear Strength: 199.9 MPa (TYPICAL)Section Size: 0.25; Cold Work: 45%; Section Size: 0.25 inCopper Development Association (CDA) — H04	0.25	—	—	—	199.9 MPa	—	54 HRB	VERIFIED
Rod	Hard (H04) Source values and qualifiers Rockwell B Hardness: 48 HRB (TYPICAL)Section Size: 1; Cold Work: 35%; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 186.2 MPa (TYPICAL)Section Size: 1; Cold Work: 35%; Section Size: 1 inCopper Development Association (CDA) — H04	1	—	—	—	186.2 MPa	—	48 HRB	VERIFIED
Rod	Nominal Grain Size 0.015 mm (OS015) · 20 °C Source values and qualifiers Tensile Strength: 227.5 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 75.8 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 46 % (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Tensile Strength: 227.5 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 75.8 MPa (TYPICAL)Section Size: 0.5; Section Size: 0.5 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 46 % (TYPICAL)Section Size: 0.5; Section Size: 0.5 inCopper Development Association (CDA) — OS015	0.5	227.5 MPa	75.8 MPa	46 %	—	—	—	VERIFIED
Rod	Nominal Grain Size 0.015 mm (OS015) Source values and qualifiers Rockwell F Hardness: 43 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) — OS015	0.5	—	—	—	151.7 MPa	—	43 HRF	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Tensile Strength: 220.6 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 68.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — OS050	1	220.6 MPa	68.9 MPa	50 %	—	—	—	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell F Hardness: 40 HRF (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 151.7 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — OS050	1	—	—	—	151.7 MPa	—	40 HRF	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: 20 % (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	20 %	—	—	—	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) — Shear Strength: 165.5 MPa (TYPICAL)Section Size: 0.065; Cold Work: 15%; Section Size: 0.065 inCopper Development Association (CDA) — H55	0.065	—	—	—	165.5 MPa	—	35 HRB	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: 40 % (TYPICAL)Section Size: 0.065; Section Size: 0.065 inCopper Development Association (CDA) — OS050	0.065	220.6 MPa	68.9 MPa	40 %	—	—	—	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
Wire	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile Strength: 351.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 282.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 6 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H02	0.08	351.6 MPa	282.7 MPa	6 %	—	—	—	VERIFIED
Wire	1/2 Hard (H02) Source values and qualifiers Shear Strength: 186.2 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H02	0.08	—	—	—	186.2 MPa	—	—	VERIFIED
Wire	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile Strength: 262 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 206.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H00	0.08	262 MPa	206.8 MPa	20 %	—	—	—	VERIFIED
Wire	1/8 Hard (H00) Source values and qualifiers Shear Strength: 172.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H00	0.08	—	—	—	172.4 MPa	—	—	VERIFIED
Wire	Hard (H04) · 20 °C Source values and qualifiers Tensile Strength: 386.1 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 351.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H04	0.08	386.1 MPa	351.6 MPa	3 %	—	—	—	VERIFIED
Wire	Hard (H04) Source values and qualifiers Shear Strength: 206.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H04	0.08	—	—	—	206.8 MPa	—	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile Strength: 227.5 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 75.8 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 40 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	227.5 MPa	75.8 MPa	40 %	—	—	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) Source values and qualifiers Shear Strength: 151.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	—	—	—	151.7 MPa	—	—	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

C14500 Tellurium 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: 85% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 65.

Weldability & Joining

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

Heat Treatment & Working Ranges

Annealing temperature range: 426.7°C to 648.9°C (800°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: Good. Capacity for Being Hot Formed: Good.

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 C14500 Tellurium Copper states: Machinability rating: 85% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 65. A relevant hardness example is Rockwell B Hardness: 43 HRB (typical; 1/2 Hard (H02), H02, Rod, 0.25). 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: Good; Oxyacetylene Welding: Fair; Gas Shielded Arc Welding: Fair; Coated Metal Arc Welding: Not Recommended; Spot Weld: Not Recommended; Seam Weld: Not Recommended; Butt Weld: Fair The first cataloged strength example is Tensile Strength: 262 MPa (typical; 1/2 Hard (H02), H02, Rod, 0.25; 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: 354.8 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 99.9 wt%, P 0.004–0.012 wt%, Te 0.4–0.7 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

For a turned electrical fitting, compare the complete machining and joining route against C11000. Improved chip control is useful only if the conductivity, connection design and final dimensions still meet the drawing. The related candidate C14700 Sulfur Copper is linked for comparison; its close equivalent 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)

C14500 Tellurium Copper Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C14500 Tellurium Copper. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status
C14700 Sulfur Copper	Copper Alloys	Close Equivalent	C14500 (tellurium-bearing) and C14700 (sulfur-bearing) both deliver 85% machinability rating and 90-93% IACS conductivity for automated screw-machined electrical parts.Direct commercial substitution is generally permissible subject to certified Mill Test Report (MTR) confirmation for critical applications.	VERIFIED
C11000 ETP Copper	Copper Alloys	Commonly Compared	C14500 provides 85% machinability rating and 93% IACS conductivity for high-speed CNC turning, whereas C11000 provides 101% IACS but only 20% machinability rating.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED
C36000 Free-Cutting Brass	Copper Alloys	Commonly Compared	C14500 offers 93% IACS electrical conductivity with 85% machinability rating, whereas C36000 offers 100% machinability but only 28% IACS conductivity.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED

Free-Machining Copper Alloy Family

Copper alloys sharing common alloying formulations and metallurgical classifications under the Free-Machining Copper branch.

2 Adjacent Grades

C14500Current Grade

C14500 Tellurium Copper

C14700

C14700 Sulfur Copper

View Grade →

Related Engineering & Metallurgy Guides

Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to C14500 Tellurium Copper.

Material Selection8–10 min read

C11000 ETP vs C10200 Oxygen-Free Copper: How to Choose

Choose copper by the atmosphere, joining route and conductivity requirement—not purity alone.

Author: Mat Grades Editorial DeskRead Guide →

Sources

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

Copper Development Association Inc.CDA Alloy C14500 Property & Specification Profile

AUTHORITATIVE BODY

Copper Development Association authoritative technical reference profile for C14500 Tellurium Copper.

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

Copper Development Association Inc.CDA UNS Standard Designations Register (C14500)

AUTHORITATIVE BODY

Unified Numbering System (UNS) designation registration register confirming active C14500 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.