Precious Metal Pt95W5
Pt95W5 is a 950-fine platinum alloy strengthened with 5 % tungsten for higher hardness and wear resistance than Pt-Co.
Reference datasheet — Pt95W5 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Cast condition
Pt95W5 tempers and conditions
Pt95W5 is supplied in 6 conditions, soft to hard. Cast is the default FabDigit quotes; the values on this page are for it.
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 |
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?
Pt95W5 is a 950-fine platinum alloy strengthened with 5 % tungsten for higher hardness and wear resistance than Pt-Co. Annealed properties are 215 MPa yield, 480 MPa tensile and 15 % elongation, and the alloy is supplied as castings, annealed sheet and wire, H01–H04 and spring tempers, mainly for prongs and settings that must resist repeated bending and abrasion. Ductility and formability are limited (elongation 15 %, formability score 50), so deep-drawn work goes to Pt95Ru5. Machinability is poor (score 30) and the alloy work-hardens during cutting. Pt95W5 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). Pt95W5 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).
What is Pt95W5 used for?
- Jewelry prong heads
- Ring settings and bezels
- Wear-resistant fine jewelry parts
- Spring-temper clasps and catches
- Cast platinum findings
- Drawn platinum wire for settings
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 properties
Typical room-temperature values for Pt95W5-Cast; bars are the position among precious metal grades.
Physical3
Pt95W5 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the precious metal family
Yield strength against density for every precious metal grade FabDigit runs. Pt95W5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pt95W5
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to Precious Metal Pt95W5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Pt950W
How much does Pt95W5 cost?
Pt95W5 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Pt95W5 — frequently asked
What is Pt95W5 used for?
Pt95W5 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?
Pt95W5 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 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 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?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
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 is the maximum service temperature of Pt95W5?
Pt95W5 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.
How much does Pt95W5 cost?
Pt95W5 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.