Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Silver 900 | Sterling Silver 925 |
|---|---|---|
| Material Family | Silver & Silver Alloys | Silver & Silver Alloys |
| Subfamily | Alloyed Silver | Sterling Silver |
| UNS Designation | P07900 | P07925 |
| ISO Designation | Ag900 | Ag925 |
| US-COIN Designation | Coin Silver 900 | — |
| DIN Designation | Ag900 | Ag925 |
| EN Designation | AgCu10 | — |
| SPECIFICATION Designation | ISO 9202 Fineness of Precious Metal Alloys | ASTM B742 Standard Specification for Fine Silver Contact Material (Grade 92.5) |
| ASTM Designation | — | B742 Grade 92.5 |
| W-Nr Designation | — | 2.1213 |
| UK-HALLMARK Designation | — | 925 |
| Element | Silver 900 | Sterling Silver 925 |
|---|---|---|
| Ag (Silver) | ≥ 90% | ≥ 92.5% |
| Cu (Copper) | 9.8 – 10% | 7.2 – 7.5% |
| Property | Silver 900 | Sterling Silver 925 |
|---|---|---|
| Density · TYPICAL · 20 °CUnit: g/cm³ | 10.31 g/cm³ | 10.36 g/cm³ |
| Mechanical Parameter | Silver 900Annealed (Soft) | Sterling Silver 925Annealed (O Temper) |
|---|---|---|
| Modulus of Elasticity · TYPICALUnit: GPa | 83 GPa | 82 GPa |
| Yield Strength (0.2% Offset) · Strip & Wire · Annealed (Soft) · TYPICALUnit: MPa | ≥ 150 MPa | — MPa |
| Yield Strength (0.2% Offset) · Strip, Sheet, Wire · Annealed (O Temper) · TYPICALUnit: MPa | — MPa | ≥ 125 MPa |
| Ultimate Tensile Strength · Strip & Wire · Annealed (Soft) · TYPICALUnit: MPa | ≥ 240 MPa | — MPa |
| Ultimate Tensile Strength · Strip, Sheet, Wire · Annealed (O Temper) · TYPICALUnit: MPa | — MPa | ≥ 220 MPa |
| Elongation at Break · Strip & Wire · Annealed (Soft) · TYPICALUnit: % | ≥ 26 % | — % |
| Elongation at Break · Strip, Sheet, Wire · in 50 mm (2 in) · Annealed (O Temper) · TYPICALUnit: % | — % | ≥ 28 % |
| Poisson's Ratio · TYPICALUnit: dimensionless | — dimensionless | 0.36 dimensionless |
| Property | Silver 900 | Sterling Silver 925 |
|---|---|---|
| Electrical Conductivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: % IACS | 78 % IACS | 84 % IACS |
| Electrical Resistivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: nΩ·m | 22.1 nΩ·m | 20.5 nΩ·m |
| Thermal Conductivity · TYPICAL · 20 °CCategory: THERMAL • Unit: W/(m·K) | 395 W/(m·K) | 410 W/(m·K) |
| Melting Range (Solidus-Liquidus) · RANGECategory: THERMAL • Unit: °C | 779–875 °C | 779–893 °C |
| Hardness Scale | Silver 900 | Sterling Silver 925 |
|---|---|---|
| HV Hardness · Annealed (Soft) · TYPICAL | 72–88 HV | 62–78 HV |
Machinability: Rated at approximately 50% relative to C36000. Chips break more easily than in sterling silver; suitable for automatic screw machining.
Weldability: Readily brazed; requires active brazing fluxes to prevent surface cuprous oxide formation.
Formability / Cold Working: Readily cold coined and stamped; exhibits moderate strain hardening requiring controlled reduction schedules.
Heat Treatment & Annealing: Solution heat treated at 740°C followed by quench; precipitation hardenable at 280°C to 300°C to achieve 135-155 HV.
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.