Precious Metal Pt95W5 Cast
Grade · default condition
Cast = as cast
Standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness.
Values for the Cast condition
Other Pt95W5 tempers and conditions
Pt95W5 is listed in 6 conditions; see the grade overview at Pt95W5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for bending, drawing, forming shanks and bezels before final work-hardening. | 190 | 420 | 30 | 119 HB | 4.9 % IACS |
CastDefaultThis page As cast | Standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness. | 215 | 480 | 15 | 128 HB | 4.9 % IACS |
Quarter hard | Compromise temper for parts that still need some bending but higher stiffness. | 400 | 560 | 16 | 161 HB | 4.8 % IACS |
Half hard | For prongs, wire and bezels needing wear resistance with limited further forming. | 590 | 700 | 8 | 199 HB | 4.8 % IACS |
Full hard | Maximum hardness and wear resistance for drawn wire, prong stock and clasp components. | 780 | 860 | 3 | 22 HRC | 4.7 % IACS |
Spring hard | Fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit. | 880 | 960 | 2 | 26 HRC | 4.7 % IACS |
What is Pt95W5 Cast?
Pt95W5 Cast is Pt95W5 in the Cast grade — standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness. Pt95W5 Cast has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 64% of precious metal grades. Elongation at break is 15% and the elastic modulus is 185 GPa (26.8 Msi). Pt95W5 Cast has a density of 21.3 g/cm³ (0.77 lb/in³), heavier than 97% of precious metal grades. It melts at 1,790°C (3,254 °F).
Advantages
- Stiff — 185 GPa (26.8 Msi), better than 93% of precious metal grades
- Good corrosion resistance — 98/100, better than 90% of precious metal grades
- High service temperature — 700°C (1,292 °F), better than 86% of precious metal grades
Limitations
- Low electrical conductivity — 4.9 % IACS, worse than 98% of precious metal grades
- Heavy — 21.3 g/cm³ (0.77 lb/in³), worse than 97% of precious metal grades
- Limited formability — 50/100, worse than 90% of precious metal grades
- Poor heat conductor — 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 89% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
Pt95W5 Cast properties
Typical room-temperature values for Pt95W5 Cast; 20 are specific to this condition. Other listed values are Pt95W5 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95W5 Cast has a density of 21.3 g/cm³ (0.77 lb/in³), heavier than 97% of precious metal grades. It melts at 1,790°C (3,254 °F).
Mechanical14
Pt95W5 Cast has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 64% of precious metal grades. Elongation at break is 15% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
Pt95W5 Cast is rated for continuous service to 700°C (1,292 °F). It conducts heat at 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 89% of precious metal grades. Thermal expansion is 8.9 µm/m·K (4.94 µin/in·°F).
Electrical3
Pt95W5 Cast conducts electricity at 4.9 % IACS, worse than 98% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (98/100), better than 90% of precious metal grades.
Sustainability3
Producing a kilogram of Pt95W5 Cast takes about 240,000 MJ of energy and emits 14,000 kg of CO₂ — more than 91% of precious metal grades. Typical recycled content is 40%.
Manufacturability8
Pt95W5 Cast's machinability is poor (30/100, worse than 86% of precious metal grades); weldability good (65/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95W5 Cast
Is Pt95W5 easy to machine?
Sharp carbide or diamond tooling, low speed with generous lubricant; the alloy is gummy and work-hardens, so avoid dwelling and take positive cuts.
Can Pt95W5 be welded?
Laser and PUK welding are routine with matching Pt950W filler; use argon shielding and avoid prolonged high-temperature air exposure to limit tungsten oxidation.
Can Pt95W5 be formed, bent or molded?
Excellent investment-casting fluidity at ~1850–1900 °C pour into hot phosphate-bonded moulds; cold work between anneals at 1000–1200 °C in inert or reducing atmosphere.
What surface finishes work on Pt95W5?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
Pt95W5 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Wsolid-solution strengthener | 4.5 – 5.5 | 5 |
| Iroptional trace/refining residual | ≤ 0.3 | — |
| Ruoptional trace | ≤ 0.3 | — |
| Other (each)impurities; total ≤0.5 to keep Pt ≥95.0 | ≤ 0.1 | — |
| Pt950 hallmark minimum fineness | ≥ 95 (balance) | — |
Pt95W5 Cast — frequently asked
What is Pt95W5 Cast used for?
Pt95W5 Cast is typically used for jewelry prong heads, ring settings and bezels, wear-resistant fine jewelry parts, spring-temper clasps and catches, cast platinum findings and drawn platinum wire for settings. In short: hardest-wearing Pt950 alloy; harder than Pt-Co; durable prong material.
What is the yield strength of Pt95W5 Cast?
Pt95W5 Cast has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 64% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95W5 Cast easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% of precious metal grades). Sharp carbide or diamond tooling, low speed with generous lubricant; the alloy is gummy and work-hardens, so avoid dwelling and take positive cuts.
Can Pt95W5 Cast be welded?
Yes — weldability is rated good (65/100). Laser and PUK welding are routine with matching Pt950W filler; use argon shielding and avoid prolonged high-temperature air exposure to limit tungsten oxidation.
What surface finishes work on Pt95W5 Cast?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
Can Pt95W5 Cast be formed, bent or molded?
Excellent investment-casting fluidity at ~1850–1900 °C pour into hot phosphate-bonded moulds; cold work between anneals at 1000–1200 °C in inert or reducing atmosphere.
What is the maximum service temperature of Pt95W5 Cast?
Pt95W5 Cast is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Pt95W5 Cast and Pt95W5 Spring?
Cast is the default condition — standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness. Spring: fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit. Yield strength is 215 MPa in Cast versus 880 MPa in Spring.
Sources
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (precious metals) — ASM International (1990)
- Precious Metals Science and Technology / Platinum jewellery alloy metallurgy — IPMI (1991)
- Platinum jewellery casting alloy data (Pt950/W) — Platinum Guild International / refiners (2020)
- Pt-W binary phase diagram and physical property compilations — ASM Alloy Phase Diagram Database (2016)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.