Copper Alloy Cu-FRTP-H04 vs Cu-FRTP-H08
Copper Alloy · Cu-FRTP temper comparison
Cu-FRTP-H04 and Cu-FRTP-H08 are two conditions of the same copper alloy grade, Cu-FRTP: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. Cu-FRTP-H08 is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 305 MPa (44.2 ksi) for Cu-FRTP-H04, about 18% more; tensile strength follows at 400 MPa (58 ksi) vs 345 MPa (50 ksi). In exchange, Cu-FRTP-H04 is the more ductile: elongation 8% versus 3% for Cu-FRTP-H08, and Cu-FRTP-H08 is harder (112 HB vs 100 HB). Cu-FRTP-H04 runs hotter in service (150°C vs 120°C continuous).
Cu-FRTP-H04Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Cu-FRTP-H08Choose it when strength drives the design.
Cu-FRTP-H04 vs Cu-FRTP-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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 122 GPa17.7 Msi · Shear Modulus 45 GPa6.5 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.34 · Reduction in Area 55% · Shear Strength 200 MPa29 ksi
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,065°C1,949 °F · Liquidus Temperature 1,083°C1,981 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 380 W/m·K220 BTU/hr·ft·°F · Specific Heat Capacity 385 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17 µm/m·K9.4 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 1.8×10⁻⁸ Ω·m0.709 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 28 / 100 · Machinability Rating (AISI 1212 = 100 %) 22% · Weldability 35 / 100 · Castability 60 / 100 · Brazeability / Solderability 90 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 57 MJ/kg24,506 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 70%
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.
Cu-FRTP-H04 vs Cu-FRTP-H08 — frequently asked
Is Cu-FRTP-H08 stronger than Cu-FRTP-H04?
Yes. Cu-FRTP-H08 has a typical yield strength of 360 MPa (52.2 ksi) against 305 MPa (44.2 ksi) for Cu-FRTP-H04 — about 18% more. Tensile strength is 400 MPa (58 ksi) vs 345 MPa (50 ksi).
Which condition does FabDigit quote by default, H04 or H08?
H04 is the default Cu-FRTP condition in the FabDigit quote flow. 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 Cu-FRTP-H04 over Cu-FRTP-H08?
Pick Cu-FRTP-H04 when the part is bent, formed or impact-loaded, or when the part sees heat. Pick Cu-FRTP-H08 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cu-FRTP-H04 and Cu-FRTP-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.