Copper Alloy C43000-H03 vs C43000-H08
Copper Alloy · C43000 temper comparison
C43000-H03 and C43000-H08 are two conditions of the same copper alloy grade, C43000: H03 (three-quarter hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C43000-H08 is the stronger of the two: yield strength 585 MPa (84.8 ksi) against 430 MPa (62.4 ksi) for C43000-H03, about 36% more; tensile strength follows at 650 MPa (94.3 ksi) vs 495 MPa (71.8 ksi). In exchange, C43000-H03 is the more ductile: elongation 12% versus 3% for C43000-H08, and C43000-H08 is harder (205 HV vs 155 HV). C43000-H03 runs hotter in service (150°C vs 120°C continuous).
C43000-H03Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C43000-H08Choose it when strength drives the design.
C43000-H03 vs C43000-H08: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 110 GPa16 Msi · Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.33 · Hardness, Brinell 130 HB
Physical
Density and transition temperatures.
Same in both: Density 8.53 g/cm³0.31 lb/in³ · Melting Point (Solidus) 900°C1,652 °F · Liquidus Temperature 1,000°C1,832 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 110 W/m·K63.6 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 19.1 µm/m·K10.6 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 6.9×10⁻⁸ Ω·m2.72 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.27 V · Corrosion Resistance 60 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Weldability 55 / 100 · Castability 35 / 100 · Brazeability / Solderability 90 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 3.7 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 40%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
C43000-H03 vs C43000-H08 — frequently asked
Is C43000-H08 stronger than C43000-H03?
Yes. C43000-H08 has a typical yield strength of 585 MPa (84.8 ksi) against 430 MPa (62.4 ksi) for C43000-H03 — about 36% more. Tensile strength is 650 MPa (94.3 ksi) vs 495 MPa (71.8 ksi).
Which condition does FabDigit quote by default, H03 or H08?
H02 is the default C43000 condition in the FabDigit quote flow (neither H03 nor H08). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, C43000-H03 or C43000-H08?
C43000-H08. Its machinability rates fair (40/100) against poor (34/100) for C43000-H03.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C43000-H03 and C43000-H08 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.