Copper Alloy C35300-H04 vs C35300-H08
Copper Alloy · C35300 temper comparison
C35300-H04 and C35300-H08 are two conditions of the same copper alloy grade, C35300: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C35300-H08 is the stronger of the two: yield strength 475 MPa (68.9 ksi) against 415 MPa (60.2 ksi) for C35300-H04, about 14% more; tensile strength follows at 550 MPa (79.8 ksi) vs 480 MPa (69.6 ksi). In exchange, C35300-H04 is the more ductile: elongation 8% versus 4% for C35300-H08, and C35300-H08 is harder (165 HB vs 145 HB).
C35300-H04Choose it when the part is bent, formed or impact-loaded.
C35300-H08Choose it when strength drives the design.
C35300-H04 vs C35300-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, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 97 GPa14.1 Msi · Shear Modulus 37 GPa5.4 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.47 g/cm³0.31 lb/in³ · Melting Point (Solidus) 888°C1,630 °F · Liquidus Temperature 899°C1,650 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 115 W/m·K66.4 BTU/hr·ft·°F · Specific Heat Capacity 380 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 160 J/g68.8 BTU/lb · Max Service Temperature (continuous) 150°C302 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 25.5 % IACS · Electrical Resistivity 6.8×10⁻⁸ Ω·m2.68 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.28 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 15 / 100 · Brazeability / Solderability 70 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 58 MJ/kg24,936 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 220 L/kg26.4 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.
C35300-H04 vs C35300-H08 — frequently asked
Is C35300-H08 stronger than C35300-H04?
Yes. C35300-H08 has a typical yield strength of 475 MPa (68.9 ksi) against 415 MPa (60.2 ksi) for C35300-H04 — about 14% more. Tensile strength is 550 MPa (79.8 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, H04 or H08?
H02 is the default C35300 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.
When should I choose C35300-H04 over C35300-H08?
Pick C35300-H04 when the part is bent, formed or impact-loaded. Pick C35300-H08 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C35300-H04 and C35300-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.