Copper Alloy CC766S-GM vs CC766S-GS
Copper Alloy · CC766S temper comparison
CC766S-GM and CC766S-GS are two conditions of the same copper alloy grade, CC766S: GM (gravity die cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. CC766S-GM is the stronger of the two: yield strength 175 MPa (25.4 ksi) against 155 MPa (22.5 ksi) for CC766S-GS, about 13% more; tensile strength follows at 440 MPa (63.8 ksi) vs 400 MPa (58 ksi). In exchange, CC766S-GS is the more ductile: elongation 20% versus 16% for CC766S-GM, and CC766S-GM is harder (105 HB vs 95 HB).
CC766S-GMChoose it when strength drives the design.
CC766S-GSChoose it when the part is bent, formed or impact-loaded.
CC766S-GM vs CC766S-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
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 37 GPa5.4 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.35 g/cm³0.3 lb/in³ · Melting Point (Solidus) 885°C1,625 °F · Liquidus Temperature 905°C1,661 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: 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 175 J/g75.2 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 22 % IACS · Electrical Resistivity 7.8×10⁻⁸ Ω·m3.07 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 45 / 100 · Machinability Rating (AISI 1212 = 100 %) 45% · Weldability 35 / 100 · Castability 75 / 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 250 L/kg30 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.
CC766S-GM vs CC766S-GS — frequently asked
Is CC766S-GM stronger than CC766S-GS?
Yes. CC766S-GM has a typical yield strength of 175 MPa (25.4 ksi) against 155 MPa (22.5 ksi) for CC766S-GS — about 13% more. Tensile strength is 440 MPa (63.8 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, GM or GS?
GS is the default CC766S 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 CC766S-GM over CC766S-GS?
Pick CC766S-GM when strength drives the design. Pick CC766S-GS when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC766S-GM and CC766S-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.