Copper Alloy CC755S-GM vs CC755S-GS
Copper Alloy · CC755S temper comparison
CC755S-GM and CC755S-GS are two conditions of the same copper alloy grade, CC755S: GM (gravity die cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. CC755S-GM is the stronger of the two: yield strength 150 MPa (21.8 ksi) against 135 MPa (19.6 ksi) for CC755S-GS, about 11% more. CC755S-GM is harder — 95 HB against 90 HB for CC755S-GS — which matters for wear surfaces and threads. CC755S-GM is stiffer (95 GPa vs 90 GPa).
CC755S-GMChoose it when strength drives the design, or when surface hardness matters.
CC755S-GM vs CC755S-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)
Reduction in Area
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 115 GPa16.7 Msi · Poisson's Ratio 0.34 · Elongation at Break 22%
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 880°C1,616 °F · Liquidus Temperature 900°C1,652 °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) 21 µm/m·K11.7 µin/in·°F · Latent Heat of Fusion 165 J/g70.9 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
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.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 75% · Weldability 25 / 100 · Castability 88 / 100 · Brazeability / Solderability 80 / 100 · Polishability 78 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 50 MJ/kg21,496 BTU/lb · Embodied Carbon (primary production) 3.1 kg CO₂/kg · Embodied Water 260 L/kg31.2 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.
CC755S-GM vs CC755S-GS — frequently asked
Is CC755S-GM stronger than CC755S-GS?
Yes. CC755S-GM has a typical yield strength of 150 MPa (21.8 ksi) against 135 MPa (19.6 ksi) for CC755S-GS — about 11% more. Tensile strength is 370 MPa (53.7 ksi) vs 355 MPa (51.5 ksi).
Which condition does FabDigit quote by default, GM or GS?
GM is the default CC755S 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 CC755S-GM over CC755S-GS?
Pick CC755S-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 CC755S-GM and CC755S-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.