Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Silver 950 | Britannia Silver 958 |
|---|---|---|
| Material Family | Silver & Silver Alloys | Silver & Silver Alloys |
| Subfamily | Alloyed Silver | Alloyed Silver |
| ISO Designation | Ag950 | Ag958 |
| DIN Designation | Ag950 | Ag958 |
| FR-MINERVE Designation | 1st Standard (950) | — |
| EN Designation | AgCu5 | AgCu4.2 |
| UK-HALLMARK Designation | — | 958 |
| SPECIFICATION Designation | — | British Hallmarking Act 1973 Schedule 2 Standards of Fineness |
| Element | Silver 950 | Britannia Silver 958 |
|---|---|---|
| Ag (Silver) | ≥ 95% | ≥ 95.84% |
| Cu (Copper) | 4.8 – 5% | 4 – 4.16% |
| Property | Silver 950 | Britannia Silver 958 |
|---|---|---|
| Density · TYPICAL · 20 °CUnit: g/cm³ | 10.38 g/cm³ | 10.4 g/cm³ |
| Mechanical Parameter | Silver 950Annealed (Soft) | Britannia Silver 958Annealed (Soft) |
|---|---|---|
| Modulus of Elasticity · TYPICALUnit: GPa | 79 GPa | 78 GPa |
| Yield Strength (0.2% Offset) · Strip & Wire · Annealed (Soft) · TYPICALUnit: MPa | ≥ 95 MPa | — MPa |
| Yield Strength (0.2% Offset) · Strip, Sheet, Wire · Annealed (Soft) · TYPICALUnit: MPa | — MPa | ≥ 80 MPa |
| Ultimate Tensile Strength · Strip & Wire · Annealed (Soft) · TYPICALUnit: MPa | ≥ 200 MPa | — MPa |
| Ultimate Tensile Strength · Strip, Sheet, Wire · Annealed (Soft) · TYPICALUnit: MPa | — MPa | ≥ 185 MPa |
| Elongation at Break · Strip & Wire · Annealed (Soft) · TYPICALUnit: % | ≥ 32 % | — % |
| Elongation at Break · Strip, Sheet, Wire · Annealed (Soft) · TYPICALUnit: % | — % | ≥ 35 % |
| Property | Silver 950 | Britannia Silver 958 |
|---|---|---|
| Electrical Conductivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: % IACS | 90 % IACS | 92 % IACS |
| Thermal Conductivity · TYPICAL · 20 °CCategory: THERMAL • Unit: W/(m·K) | 415 W/(m·K) | 420 W/(m·K) |
| Melting Range (Solidus-Liquidus) · RANGECategory: THERMAL • Unit: °C | 840–925 °C | 870–940 °C |
| Hardness Scale | Silver 950 | Britannia Silver 958 |
|---|---|---|
| HV Hardness · Annealed (Soft) · TYPICAL | 55–68 HV | 48–62 HV |
Machinability: Rated at approximately 38% relative to C36000. Moderate chip curl; tools must remain sharp to prevent burring.
Weldability: Readily brazed using silver solder; preheat recommended for thick sections to mitigate heat dissipation.
Formability / Cold Working: Balanced cold workability; readily formed, punched, and rolled with high surface integrity.
Heat Treatment & Annealing: Annealed at 500°C to 580°C for 20 minutes, followed by water quench. Shows slight precipitation hardening response.
Machinability: Rated at approximately 35% relative to C36000. Softer and more ductile than sterling silver; tends to form continuous chips requiring chip-breaker tool geometries.
Weldability: Readily brazed using silver-bearing filler metals. Less prone to deep firescale oxidation than sterling silver due to lower copper fraction.
Formability / Cold Working: Superb spinning and deep drawing performance; requires fewer intermediate annealing steps than 925 sterling.
Heat Treatment & Annealing: Annealed at 450°C to 550°C for 20 minutes, followed by water quench. Demonstrates minor precipitation hardening capability due to copper supersaturation.