Copper Alloy Cu-ETP1
EN CR003A
Cu-ETP1 (CR003A) is a high-purity electrolytic tough-pitch copper with tighter impurity limits than standard Cu-ETP, supplied as rod and wire stock in tempers from soft M through R200, H040, R240, R290 and R360, plus cast.
Reference datasheet — Cu-ETP1 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M condition
Cu-ETP1 tempers and conditions
Cu-ETP1 is supplied in 7 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | Unwrought cast product to EN 1976 used as remelt / rolling stock rather than as a finished engineering shape. | 55 | 175 | 30 | 40 HB | 101 % IACS |
annealed / soft, Rm ≥ 200 MPa | Fully soft condition for maximum conductivity, bending and winding of magnet wire or flexible busbar. | 60 | 215 | 42 | 43 HB | 101.5 % IACS |
MDefault Thermomechanically controlled processed | Standard 8 mm bright rod / wire rod as supplied by the rod mill — the feedstock for all drawing operations. | 70 | 220 | 40 | 45 HB | 101.5 % IACS |
Hardness temper, 40–65 HV | Ordered when a hardness window rather than a strength window is specified — essentially soft-drawn rod/bar. | 80 | 225 | 35 | 50 HB | 101 % IACS |
half-hard drawn, Rm ≥ 240 MPa | Half-hard drawn rod/bar giving a workable compromise between strength and remaining bendability for busbar and terminals. | 180 | 255 | 15 | 75 HB | 100 % IACS |
hard drawn, Rm ≥ 290 MPa | Hard-drawn rod/bar for overhead conductors, commutator bars and mechanically loaded electrical parts. | 260 | 315 | 6 | 95 HB | 98.5 % IACS |
Extra hard drawn wire, Rm ≥ 360 MPa | Heavily drawn fine wire for hard-drawn conductors and springy contacts where tensile strength matters more than elongation. | 340 | 385 | 2 | 110 HB | 97.5 % IACS |
What is Cu-ETP1?
Cu-ETP1 (CR003A) is a high-purity electrolytic tough-pitch copper with tighter impurity limits than standard Cu-ETP, supplied as rod and wire stock in tempers from soft M through R200, H040, R240, R290 and R360, plus cast. Engineers select it where conductivity governs: 101.5 % IACS electrical and 394 W/m·K thermal, with 220 MPa tensile, 70 MPa yield, 40 % elongation and 45 HB in the soft condition. Service is limited to about 200 °C. As an oxygen-bearing copper it is prone to porosity and hydrogen embrittlement, so Cu-OF or Cu-DHP is preferred for welded assemblies. Cu-ETP1 has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 1,065°C (1,949 °F). Cu-ETP1 has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 220 MPa (31.9 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
What is Cu-ETP1 used for?
- electrical rod stock
- busbars
- high-conductivity connectors
Advantages
- Conducts heat well — 394 W/m·K (227.6 BTU/hr·ft·°F), better than 100% of copper alloy grades
- High electrical conductivity — 101.5 % IACS, better than 100% of copper alloy grades
- Forms and bends easily — 95/100, better than 94% of copper alloy grades
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
Limitations
- Low strength — 70 MPa (10.2 ksi), worse than 93% of copper alloy grades
Cu-ETP1 properties
Typical room-temperature values for Cu-ETP1-M; bars are the position among copper alloy grades.
Physical3
Cu-ETP1 has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical13
Cu-ETP1 has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 220 MPa (31.9 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
Cu-ETP1 is rated for continuous service to 200°C (392 °F). It conducts heat at 394 W/m·K (227.6 BTU/hr·ft·°F), better than 100% of copper alloy grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
Cu-ETP1 conducts electricity at 101.5 % IACS, better than 100% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of Cu-ETP1 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 85% of copper alloy grades. Typical recycled content is 10%.
Manufacturability8
Cu-ETP1's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (50/100); formability excellent (95/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. Cu-ETP1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Cu-ETP1
Is Cu-ETP1 easy to machine?
Gummy and long-chipping — use sharp positive-rake tools, high speed, low feed and generous coolant; expect ~20 % of AISI 1212 productivity, consider C14500/C36000 if machining dominates.
Can Cu-ETP1 be welded?
Weldable by GTAW/GMAW with phosphorus-deoxidised filler and high preheat, but oxygen-bearing tough-pitch copper is prone to porosity and hydrogen embrittlement — avoid reducing atmospheres above ~400 °C; prefer Cu-DHP/Cu-OF for welded assemblies.
Can Cu-ETP1 be formed, bent or molded?
Outstanding cold drawing, upsetting and bending in the soft/M condition; interstage anneals at 400–600 °C restore ductility, and hard tempers should be bent generously to avoid edge cracking.
Cu-ETP1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Otough-pitch oxygen content | 0.01 – 0.04 | 0.03 |
| Agcounted as Cu | ≤ 0 | |
| Bitighter than Cu-ETP | ≤ 5×10⁻⁴ | |
| Pb | ≤ 5×10⁻⁴ | |
| Se | ≤ 2×10⁻⁴ | |
| Te | ≤ 2×10⁻⁴ | |
| S | ≤ 0 | |
| As | ≤ 5×10⁻⁴ | |
| Sb | ≤ 4×10⁻⁴ | |
| Fe | ≤ 0 | |
| Ni | ≤ 0 | |
| Sn | ≤ 5×10⁻⁴ | |
| Zn | ≤ 0 | |
| P | ≤ 5×10⁻⁴ | |
| total impurities (excl. O, Ag)Cu-CATH-1 quality feed per EN 1978 | ≤ 0.01 | |
| CuCu including Ag, minimum; balance | ≥ 99.95 (balance) |
What surface finishes work on Cu-ETP1?
Not anodisable; solders and electroplates (Sn, Ni, Ag) readily, takes a high polish but tarnishes — protect with benzotriazole, lacquer or plating.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy Cu-ETP1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CR003A
How much does Cu-ETP1 cost?
Cu-ETP1 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Cu-ETP1 — frequently asked
What is Cu-ETP1 used for?
Cu-ETP1 is typically used for electrical rod stock, busbars and high-conductivity connectors. In short: highest-conductivity ETP rod; 101.5 % IACS; poor choice for welding.
What is the yield strength of Cu-ETP1?
Cu-ETP1 has a typical yield strength of 70 MPa (10.2 ksi) and a tensile strength of 220 MPa (31.9 ksi) — weaker than 93% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is Cu-ETP1 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Gummy and long-chipping — use sharp positive-rake tools, high speed, low feed and generous coolant; expect ~20 % of AISI 1212 productivity, consider C14500/C36000 if machining dominates.
Can Cu-ETP1 be welded?
With care — weldability is rated fair (50/100). Weldable by GTAW/GMAW with phosphorus-deoxidised filler and high preheat, but oxygen-bearing tough-pitch copper is prone to porosity and hydrogen embrittlement — avoid reducing atmospheres above ~400 °C; prefer Cu-DHP/Cu-OF for welded assemblies.
What surface finishes work on Cu-ETP1?
Not anodisable; solders and electroplates (Sn, Ni, Ag) readily, takes a high polish but tarnishes — protect with benzotriazole, lacquer or plating.
Can Cu-ETP1 be formed, bent or molded?
Outstanding cold drawing, upsetting and bending in the soft/M condition; interstage anneals at 400–600 °C restore ductility, and hard tempers should be bent generously to avoid edge cracking.
What is the maximum service temperature of Cu-ETP1?
Cu-ETP1 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Cu-ETP1-M and Cu-ETP1-R360?
M is the default condition — standard 8 mm bright rod / wire rod as supplied by the rod mill — the feedstock for all drawing operations. R360: heavily drawn fine wire for hard-drawn conductors and springy contacts where tensile strength matters more than elongation. Yield strength is 70 MPa in M versus 340 MPa in R360.
How much does Cu-ETP1 cost?
Cu-ETP1 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 1976 — Copper and copper alloys: cast unwrought copper products (Cu-ETP1, CR003A) — CEN (2012)
- EN 13601 — Copper rod, bar and wire for general electrical purposes — CEN (2021)
- EN 13602 — Drawn round copper wire for electrical conductors — CEN (2013)
- EN 1978 — Copper cathodes (Cu-CATH-1) — CEN (1998)
- ASM Handbook Vol. 2 — Properties of Copper and Copper Alloys — ASM International (1990)
- CDA alloy datasheet C11000 (ETP copper) — Copper Development Association (2023)
- IEC 60028 — International standard of resistance for copper — IEC (1925)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.