Copper Alloy CC750S-GM vs CC750S-GS
Copper Alloy · CC750S temper comparison
CC750S-GM and CC750S-GS are two conditions of the same copper alloy grade, CC750S: GM (permanent (metal) mould cast, gravity die) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. CC750S-GM is the stronger of the two: yield strength 110 MPa (16 ksi) against 90 MPa (13.1 ksi) for CC750S-GS, about 22% more; tensile strength follows at 250 MPa (36.3 ksi) vs 210 MPa (30.5 ksi). In exchange, CC750S-GS is the more ductile: elongation 18% versus 15% for CC750S-GM, and CC750S-GM is harder (65 HB vs 55 HB).
CC750S-GMChoose it when strength drives the design.
CC750S-GSChoose it when the part is bent, formed or impact-loaded.
CC750S-GM vs CC750S-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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 36 GPa5.2 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.34 · Reduction in Area 20%
Physical
Density and transition temperatures.
Same in both: Density 8.5 g/cm³0.31 lb/in³ · Melting Point (Solidus) 900°C1,652 °F · Liquidus Temperature 935°C1,715 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 115 W/m·K66.4 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 26 % IACS · Electrical Resistivity 6.6×10⁻⁸ Ω·m2.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.26 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 85 / 100 · Machinability Rating (AISI 1212 = 100 %) 80% · Weldability 20 / 100 · Formability (cold) 20 / 100 · Castability 85 / 100 · Brazeability / Solderability 75 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Embodied Carbon (primary production) 3.2 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 85%
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.
CC750S-GM vs CC750S-GS — frequently asked
Is CC750S-GM stronger than CC750S-GS?
Yes. CC750S-GM has a typical yield strength of 110 MPa (16 ksi) against 90 MPa (13.1 ksi) for CC750S-GS — about 22% more. Tensile strength is 250 MPa (36.3 ksi) vs 210 MPa (30.5 ksi).
Which condition does FabDigit quote by default, GM or GS?
GS is the default CC750S 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 CC750S-GM over CC750S-GS?
Pick CC750S-GM when strength drives the design. Pick CC750S-GS when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC750S-GM and CC750S-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.