Copper Alloy C43500-H04 vs C43500-H08
Copper Alloy · C43500 temper comparison
C43500-H04 and C43500-H08 are two conditions of the same copper alloy grade, C43500: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C43500-H08 is the stronger of the two: yield strength 540 MPa (78.3 ksi) against 450 MPa (65.3 ksi) for C43500-H04, about 20% more; tensile strength follows at 605 MPa (87.7 ksi) vs 505 MPa (73.2 ksi). In exchange, C43500-H04 is the more ductile: elongation 5% versus 3% for C43500-H08, and C43500-H08 is harder (172 HB vs 145 HB). On the shop floor, C43500-H04 welds better (fair vs poor).
C43500-H04Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
C43500-H08Choose it when strength drives the design.
C43500-H04 vs C43500-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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.53 g/cm³0.31 lb/in³ · Melting Point (Solidus) 899°C1,650 °F · Liquidus Temperature 927°C1,701 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.3 µm/m·K11.3 µin/in·°F · Latent Heat of Fusion 175 J/g75.2 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.26 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 30 / 100 · Brazeability / Solderability 92 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.5 kg CO₂/kg · Embodied Water 280 L/kg33.6 gal/lb · Typical Recycled Content 45%
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.
C43500-H04 vs C43500-H08 — frequently asked
Is C43500-H08 stronger than C43500-H04?
Yes. C43500-H08 has a typical yield strength of 540 MPa (78.3 ksi) against 450 MPa (65.3 ksi) for C43500-H04 — about 20% more. Tensile strength is 605 MPa (87.7 ksi) vs 505 MPa (73.2 ksi).
Which condition does FabDigit quote by default, H04 or H08?
OS025 is the default C43500 condition in the FabDigit quote flow (neither H04 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 welds better, C43500-H04 or C43500-H08?
C43500-H04. Its weldability rates fair (40/100) against poor (30/100) for C43500-H08.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C43500-H04 and C43500-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.