Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Sterling Silver 925 | C11000 ETP Copper |
|---|---|---|
| Material Family | Silver & Silver Alloys | Copper Alloys |
| Subfamily | Sterling Silver | Pure Copper |
| UNS Designation | P07925 | C11000 |
| ISO Designation | Ag925 | — |
| ASTM Designation | B742 Grade 92.5 | — |
| DIN Designation | Ag925 | — |
| W-Nr Designation | 2.1213 | — |
| UK-HALLMARK Designation | 925 | — |
| SPECIFICATION Designation | ASTM B742 Standard Specification for Fine Silver Contact Material (Grade 92.5) | ASTM B187/B187M |
| COMMERCIAL Designation | — | Electrolytic Tough Pitch |
| Element | Sterling Silver 925 | C11000 ETP Copper |
|---|---|---|
| Ag (Silver) | ≥ 92.5% | — |
| Cu (Copper) | 7.2 – 7.5% | ≥ 99.9% |
| Property | Sterling Silver 925 | C11000 ETP Copper |
|---|---|---|
| Density · TYPICAL · 20 °CUnit: g/cm³ | 10.36 g/cm³ | 8.885–8.941 g/cm³ |
| Specific Gravity · TYPICALUnit: — | — — | 8.91 — |
| Mechanical Parameter | Sterling Silver 925Annealed (O Temper) | C11000 ETP Copper1/2 Hard (H02) |
|---|---|---|
| Modulus of Elasticity · TYPICALUnit: | 82 GPa | 117210.9 MPa |
| Poisson's Ratio · TYPICALUnit: dimensionless | 0.36 dimensionless | — dimensionless |
| Yield Strength (0.2% Offset) · Strip, Sheet, Wire · Annealed (O Temper) · TYPICALUnit: MPa | ≥ 125 MPa | — MPa |
| Ultimate Tensile Strength · Strip, Sheet, Wire · Annealed (O Temper) · TYPICALUnit: MPa | ≥ 220 MPa | — MPa |
| Tensile Strength · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa | — MPa | 289.6 MPa |
| Elongation at Break · Strip, Sheet, Wire · in 50 mm (2 in) · Annealed (O Temper) · TYPICALUnit: % | ≥ 28 % | — % |
| Elongation · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: % | — % | 14 % |
| Modulus of Rigidity · TYPICALUnit: MPa | — MPa | 44126.4 MPa |
| Machinability Rating · TYPICALUnit: % | — % | 20 % |
| Forgeability Rating · TYPICALUnit: — | — — | 65 — |
| Shear Strength · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa | — MPa | 179.3 MPa |
| Fatigue Strength · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa | — MPa | 89.6 MPa |
| Property | Sterling Silver 925 | C11000 ETP Copper |
|---|---|---|
| Electrical Conductivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: % IACS | 84 % IACS | 101 % IACS |
| Electrical Resistivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: nΩ·m | 20.5 nΩ·m | — nΩ·m |
| Thermal Conductivity · TYPICAL · 20 °CCategory: THERMAL • Unit: W/(m·K) | 410 W/(m·K) | 391.15 W/(m·K) |
| Melting Range (Solidus-Liquidus) · RANGECategory: THERMAL • Unit: °C | 779–893 °C | — °C |
| Liquidus Temperature · TYPICALCategory: THERMAL • Unit: °C | — °C | 1082.8 °C |
| Solidus Temperature · TYPICALCategory: THERMAL • Unit: °C | — °C | 1065 °C |
| Coefficient of Thermal Expansion (68-212°F) · TYPICALCategory: THERMAL • Unit: µm/(m·K) | — µm/(m·K) | 16.92 µm/(m·K) |
| Coefficient of Thermal Expansion (68-392°F) · TYPICALCategory: THERMAL • Unit: µm/(m·K) | — µm/(m·K) | 17.28 µm/(m·K) |
| Coefficient of Thermal Expansion (68-572°F) · TYPICALCategory: THERMAL • Unit: µm/(m·K) | — µm/(m·K) | 17.64 µm/(m·K) |
| Specific Heat Capacity · TYPICAL · 20 °CCategory: THERMAL • Unit: J/(kg·K) | — J/(kg·K) | 385.2 J/(kg·K) |
| Annealing Temperature Range · RANGECategory: THERMAL • Unit: °C | — °C | 371.1–648.9 °C |
| Hot Working Temperature Range · RANGECategory: THERMAL • Unit: °C | — °C | 760–871.1 °C |
| Hardness Scale | Sterling Silver 925 | C11000 ETP Copper |
|---|---|---|
| HV Hardness · Annealed (O Temper) · TYPICAL | 62–78 HV | — |
| Rockwell B Hardness · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °C | — | 40 HRB |
| Rockwell F Hardness · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °C | — | 84 HRF |
| Rockwell 30T Hardness · Flat Products · 0.04 in · 1/2 Hard (H02) · TYPICAL · 20 °C | — | 50 HR30T |
Machinability: Rated at approximately 45% relative to C36000. Chips shear more cleanly than fine silver; tool life is good when using positive rake carbide inserts and flood oil/emulsion coolant.
Weldability: Readily brazed using silver solder (AWS BAg-1 to BAg-7). Subject to firescale (subsurface cuprous oxide Cu2O formation) when heated in oxidizing atmospheres without flux.
Formability / Cold Working: Excellent cold working characteristics; readily stamped, coined, and rolled with periodic annealing at 600°C.
Heat Treatment & Annealing: Precipitation hardenable: Solution heat treat at 740°C to 760°C for 15-30 minutes and rapid water quench; artificial age at 280°C to 300°C for 45-60 minutes to achieve peak hardness of 110-140 HV.
Machinability: Machinability rating: 20% relative to free-cutting brass (C36000 = 100%). Forgeability rating: 65.
Weldability: Soldering: Excellent; Brazing: Good; Butt Welding: Good; Gas Shielded Arc Welding: Fair; Oxyacetylene Welding, Coated Metal Arc Welding, Spot Welding, and Seam Welding: Not Recommended.
Formability / Cold Working: Capacity for being cold worked: Excellent; Capacity for being hot formed: Excellent.
Heat Treatment & Annealing: Annealing temperature range: 371.1°C to 648.9°C (700°F - 1200°F). Hot working temperature range: 760.0°C to 871.1°C (1400°F - 1600°F).