Precious Metal Pt95W5-O (Annealed)
Temper
Pick for bending, drawing, forming shanks and bezels before final work-hardening.
Values for the O 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 |
|---|---|---|---|---|---|---|
OThis page Annealed | Pick for bending, drawing, forming shanks and bezels before final work-hardening. | 190 | 420 | 30 | 119 HB | 4.9 % IACS |
CastDefault 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-O?
Pt95W5-O is Pt95W5 in the O temper — pick for bending, drawing, forming shanks and bezels before final work-hardening. Pt95W5-O has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 56% of precious metal grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi). Pt95W5-O 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). Cast is the default condition FabDigit quotes; O is available on request or by drawing note.
Advantages
- Stiff — 190 GPa (27.6 Msi), better than 94% 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
- Readily welded — 75/100, better than 78% 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
- Difficult to machine — 28/100, worse than 91% 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-O properties
Typical room-temperature values for Pt95W5-O; 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-O 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-O has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 56% of precious metal grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
Pt95W5-O 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-O 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-O 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-O's machinability is poor (28/100, worse than 91% of precious metal grades); weldability very good (75/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95W5-O
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-O — frequently asked
What is Pt95W5-O used for?
Pt95W5-O 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-O?
Pt95W5-O has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 56% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95W5-O easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% 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-O be welded?
Yes — weldability is rated very good (75/100). 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-O?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
Can Pt95W5-O 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-O?
Pt95W5-O 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.