Copper Alloy C70250-TM04 vs C70250-TM08
Copper Alloy · C70250 temper comparison
C70250-TM04 and C70250-TM08 are two conditions of the same copper alloy grade, C70250: TM04 (mill hardened, full hard) versus TM08 (mill hardened, spring hard). The chemistry is identical, so every difference below comes from the condition. C70250-TM08 is the stronger of the two: yield strength 800 MPa (116 ksi) against 720 MPa (104 ksi) for C70250-TM04, about 11% more; tensile strength follows at 845 MPa (123 ksi) vs 775 MPa (112 ksi). In exchange, C70250-TM04 is the more ductile: elongation 6% versus 4% for C70250-TM08, and C70250-TM08 is harder (240 HV vs 220 HV).
C70250-TM04Choose it when the part is bent, formed or impact-loaded.
C70250-TM08Choose it when strength drives the design.
C70250-TM04 vs C70250-TM08: 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, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 50 GPa7.3 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.82 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,065°C1,949 °F · Liquidus Temperature 1,095°C2,003 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.6 µm/m·K9.8 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V · Corrosion Resistance 62 / 100
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 35 / 100 · Brazeability / Solderability 80 / 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) 4 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 30%
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.
C70250-TM04 vs C70250-TM08 — frequently asked
Is C70250-TM08 stronger than C70250-TM04?
Yes. C70250-TM08 has a typical yield strength of 800 MPa (116 ksi) against 720 MPa (104 ksi) for C70250-TM04 — about 11% more. Tensile strength is 845 MPa (123 ksi) vs 775 MPa (112 ksi).
Which condition does FabDigit quote by default, TM04 or TM08?
TM02 is the default C70250 condition in the FabDigit quote flow (neither TM04 nor TM08). 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 C70250-TM04 over C70250-TM08?
Pick C70250-TM04 when the part is bent, formed or impact-loaded. Pick C70250-TM08 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C70250-TM04 and C70250-TM08 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.