Precious Metal Pt95Ir5 AS-CAST
Heat-treated state
ASTM B562
Cast crucible ware, anodes and blanks intended for subsequent working; coarse grain and lower strength.
Values for the AS-CAST condition
Other Pt95Ir5 tempers and conditions
Pt95Ir5 is listed in 6 conditions; see the grade overview at Pt95Ir5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AS-CASTThis page investment/continuous cast stock | Cast crucible ware, anodes and blanks intended for subsequent working; coarse grain and lower strength. | 110 | 215 | 18 | 71 HB | 9.1 % IACS |
AnnealedDefault fully softened (recrystallized ~1000–1200 °C) | Default stock condition for wire, sheet and tube where maximum ductility, deep drawing or coiling is required. | 125 | 250 | 32 | 76 HB | 9.1 % IACS |
Quarter hard | Light temper for parts needing a little extra stiffness while still tolerating moderate bending or forming. | 250 | 330 | 15 | 104 HB | 8.9 % IACS |
Half hard | Balanced temper for contacts, electrodes and marker bands needing strength with some residual ductility. | 350 | 420 | 7 | 128 HB | 8.7 % IACS |
Full hard | Choose for maximum strength and wear resistance in straight wire, probes and stiff electrode shafts. | 470 | 520 | 3 | 151 HB | 8.6 % IACS |
Spring hard | Heavily drawn fine wire for springs, guidewires and stiff microelectrodes; minimal remaining ductility. | 545 | 590 | 2 | 165 HB | 8.5 % IACS |
What is Pt95Ir5 AS-CAST?
Pt95Ir5 AS-CAST is Pt95Ir5 heat treated to AS-CAST — cast crucible ware, anodes and blanks intended for subsequent working; coarse grain and lower strength. Pt95Ir5 AS-CAST has a yield strength of 110 MPa (16 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 80% of precious metal grades. Elongation at break is 18% and the elastic modulus is 172 GPa (24.9 Msi). Pt95Ir5 AS-CAST has a density of 21.5 g/cm³ (0.777 lb/in³), heavier than 98% of precious metal grades. It melts at 1,779°C (3,234 °F). Annealed is the default condition FabDigit quotes; AS-CAST is available on request or by drawing note.
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 95% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- Readily welded — 85/100, better than 93% of precious metal grades
- Stiff — 172 GPa (24.9 Msi), better than 90% of precious metal grades
Limitations
- Heavy — 21.5 g/cm³ (0.777 lb/in³), worse than 98% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Limited formability — 60/100, worse than 87% of precious metal grades
- Difficult to machine — 30/100, worse than 86% of precious metal grades
- Poor heat conductor — 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 84% of precious metal grades
Pt95Ir5 AS-CAST properties
Typical room-temperature values for Pt95Ir5 AS-CAST; 19 are specific to this condition. Other listed values are Pt95Ir5 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95Ir5 AS-CAST has a density of 21.5 g/cm³ (0.777 lb/in³), heavier than 98% of precious metal grades. It melts at 1,779°C (3,234 °F).
Mechanical11
Pt95Ir5 AS-CAST has a yield strength of 110 MPa (16 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 80% of precious metal grades. Elongation at break is 18% and the elastic modulus is 172 GPa (24.9 Msi).
Thermal6
Pt95Ir5 AS-CAST is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 84% of precious metal grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Pt95Ir5 AS-CAST conducts electricity at 9.1 % IACS, worse than 82% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (99/100), better than 93% of precious metal grades.
Sustainability4
Producing a kilogram of Pt95Ir5 AS-CAST takes about 250,000 MJ of energy and emits 14,000 kg of CO₂ — more than 95% of precious metal grades. Typical recycled content is 40%.
Manufacturability8
Pt95Ir5 AS-CAST's machinability is poor (30/100, worse than 86% of precious metal grades); weldability excellent (85/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ir5 AS-CAST
Is Pt95Ir5 easy to machine?
Soft and gummy — use sharp uncoated carbide or HSS, positive rake, high speed, light continuous feed and flood lubrication; collect all chips and swarf for refining credit.
Can Pt95Ir5 be welded?
Excellent for laser, micro-TIG, resistance and pulse-arc welding in clean/inert conditions; avoid contact with silicon, lead, sulfur or reducing flames that embrittle PGMs.
Can Pt95Ir5 be formed, bent or molded?
Annealed material cold-works readily by drawing, rolling, deep drawing and coining; interanneal at 900–1100 °C in air or clean inert gas after ~50–70 % reduction.
What surface finishes work on Pt95Ir5?
Electropolishing or diamond/alumina polishing yields a bright, biocompatible mirror surface; no plating or anodizing needed, and passivation is unnecessary.
Pt95Ir5 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 |
|---|---|---|
| Irsolid-solution strengthener | 4.5 – 5.5 | 5 |
| Other PGM (Pd, Rh, Ru) + base metalstotal impurities, refined grade | ≤ 0.1 | 0.05 |
| PtPt+Ir ≥ 99.9 % typical | balance | — |
Pt95Ir5 AS-CAST — frequently asked
What is Pt95Ir5 AS-CAST used for?
Pt95Ir5 AS-CAST is typically used for jewelry, electrodes, precision wire and crucibles. In short: most formable Pt-Ir grade; softer than Pt90Ir10; biocompatible, tarnish-free surface.
What is the yield strength of Pt95Ir5 AS-CAST?
Pt95Ir5 AS-CAST has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 80% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ir5 AS-CAST easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% of precious metal grades). Soft and gummy — use sharp uncoated carbide or HSS, positive rake, high speed, light continuous feed and flood lubrication; collect all chips and swarf for refining credit.
Can Pt95Ir5 AS-CAST be welded?
Yes — weldability is rated excellent (85/100). Excellent for laser, micro-TIG, resistance and pulse-arc welding in clean/inert conditions; avoid contact with silicon, lead, sulfur or reducing flames that embrittle PGMs.
What surface finishes work on Pt95Ir5 AS-CAST?
Electropolishing or diamond/alumina polishing yields a bright, biocompatible mirror surface; no plating or anodizing needed, and passivation is unnecessary.
Can Pt95Ir5 AS-CAST be formed, bent or molded?
Annealed material cold-works readily by drawing, rolling, deep drawing and coining; interanneal at 900–1100 °C in air or clean inert gas after ~50–70 % reduction.
What is the maximum service temperature of Pt95Ir5 AS-CAST?
Pt95Ir5 AS-CAST is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Pt95Ir5 Annealed and Pt95Ir5 Spring?
Annealed is the default condition — default stock condition for wire, sheet and tube where maximum ductility, deep drawing or coiling is required. Spring: heavily drawn fine wire for springs, guidewires and stiff microelectrodes; minimal remaining ductility. Yield strength is 125 MPa in Annealed versus 545 MPa in Spring.
Sources
- ASTM B684 — Platinum-Iridium Electrical Contact Material — ASTM International (2020)
- ASTM B562 — Refined Platinum — ASTM International (2020)
- ASM Handbook Vol. 2 — Properties of Precious Metals and Alloys — ASM International (1990)
- Platinum-iridium alloy technical data — Johnson Matthey / Deringer-Ney (2022)
- CRC Handbook of Chemistry and Physics — physical constants of Pt and Ir — CRC Press (2021)
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.