Copper Alloy CC765S-GM vs CC765S-GS
Copper Alloy · CC765S temper comparison
CC765S-GM and CC765S-GS are two conditions of the same copper alloy grade, CC765S: GM (permanent (chill) mould cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. CC765S-GM is the stronger of the two: yield strength 270 MPa (39.2 ksi) against 230 MPa (33.4 ksi) for CC765S-GS, about 17% more; tensile strength follows at 530 MPa (76.9 ksi) vs 480 MPa (69.6 ksi). CC765S-GM is harder — 130 HB against 120 HB for CC765S-GS — which matters for wear surfaces and threads.
CC765S-GMChoose it when strength drives the design, or when surface hardness matters.
CC765S-GM vs CC765S-GS: 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
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 38 GPa5.5 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8 g/cm³0.29 lb/in³ · Melting Point (Solidus) 880°C1,616 °F · Liquidus Temperature 915°C1,679 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 60 W/m·K34.7 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.5 µm/m·K11.4 µin/in·°F · Latent Heat of Fusion 170 J/g73.1 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 13 % IACS · Electrical Resistivity 1.33×10⁻⁷ Ω·m5.24 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 40 / 100 · Castability 80 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 75%
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.
CC765S-GM vs CC765S-GS — frequently asked
Is CC765S-GM stronger than CC765S-GS?
Yes. CC765S-GM has a typical yield strength of 270 MPa (39.2 ksi) against 230 MPa (33.4 ksi) for CC765S-GS — about 17% more. Tensile strength is 530 MPa (76.9 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, GM or GS?
GS is the default CC765S 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 CC765S-GM over CC765S-GS?
Pick CC765S-GM when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC765S-GM and CC765S-GS 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.