Copper Alloy C72900-TB00 vs C72900-TM08
Copper Alloy · C72900 temper comparison
C72900-TB00 and C72900-TM08 are two conditions of the same copper alloy grade, C72900: TB00 (solution heat treated) versus TM08 (mill hardened, spring hard). The chemistry is identical, so every difference below comes from the condition. C72900-TM08 is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 280 MPa (40.6 ksi) for C72900-TB00, about 3.6 times as much; tensile strength follows at 1,070 MPa (155 ksi) vs 520 MPa (75.4 ksi). In exchange, C72900-TB00 is the more ductile: elongation 35% versus 4% for C72900-TM08, and C72900-TM08 is harder (360 HV vs 155 HV). C72900-TM08 runs hotter in service (240°C vs 200°C continuous) and C72900-TM08 conducts heat better (35 W/m·K vs 22 W/m·K). On the shop floor, C72900-TM08 machines more easily (good vs fair).
C72900-TB00Choose it when the part is bent, formed or impact-loaded.
C72900-TM08Choose it when strength drives the design, or when the part sees heat.
C72900-TB00 vs C72900-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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 131 GPa19 Msi · Shear Modulus 50 GPa7.3 Msi · Bulk Modulus 109 GPa15.8 Msi · Poisson's Ratio 0.3 · Reduction in Area 20% · Compressive Strength 1,020 MPa148 ksi · Shear Strength 650 MPa94.3 ksi · Hardness, Brinell 330 HB
Physical
Density and transition temperatures.
Same in both: Density 8.86 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,050°C1,922 °F · Liquidus Temperature 1,140°C2,084 °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 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.7 µm/m·K9.3 µin/in·°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) -0.25 V · Corrosion Resistance 78 / 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 25 / 100 · Brazeability / Solderability 55 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 95 MJ/kg40,843 BTU/lb · Embodied Carbon (primary production) 7 kg CO₂/kg · Embodied Water 320 L/kg38.3 gal/lb · Typical Recycled Content 25%
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.
C72900-TB00 vs C72900-TM08 — frequently asked
Is C72900-TM08 stronger than C72900-TB00?
Yes. C72900-TM08 has a typical yield strength of 1,000 MPa (145 ksi) against 280 MPa (40.6 ksi) for C72900-TB00 — about 3.6 times as much. Tensile strength is 1,070 MPa (155 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, TB00 or TM08?
TF00 is the default C72900 condition in the FabDigit quote flow (neither TB00 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.
Which is easier to machine, C72900-TB00 or C72900-TM08?
C72900-TM08. Its machinability rates good (65/100) against fair (40/100) for C72900-TB00.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C72900-TB00 and C72900-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.