Precious Metal Pt95Ir5 Annealed
Temper · default condition
ASTM B562
Default stock condition for wire, sheet and tube where maximum ductility, deep drawing or coiling is required.
Values for the Annealed 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 |
|---|---|---|---|---|---|---|
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 |
AnnealedDefaultThis page 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 Annealed?
Pt95Ir5 Annealed is Pt95Ir5 in the Annealed temper — default stock condition for wire, sheet and tube where maximum ductility, deep drawing or coiling is required. Pt95Ir5 Annealed has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 74% of precious metal grades. Elongation at break is 32% and the elastic modulus is 175 GPa (25.4 Msi). Pt95Ir5 Annealed 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).
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 — 175 GPa (25.4 Msi), better than 91% of precious metal grades
- Ductile — tolerates forming and impact — 32%, better than 75% of precious metal grades
Limitations
- Heavy — 21.5 g/cm³ (0.777 lb/in³), worse than 98% of precious metal grades
- Difficult to machine — 28/100, worse than 91% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Poor heat conductor — 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 84% of precious metal grades
- Low electrical conductivity — 9.1 % IACS, worse than 82% of precious metal grades
Pt95Ir5 Annealed properties
Typical room-temperature values for Pt95Ir5 Annealed; 13 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 Annealed 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 Annealed has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 74% of precious metal grades. Elongation at break is 32% and the elastic modulus is 175 GPa (25.4 Msi).
Thermal6
Pt95Ir5 Annealed 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 Annealed 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 Annealed 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 Annealed's machinability is poor (28/100, worse than 91% of precious metal grades); weldability excellent (85/100); formability excellent (92/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ir5 Annealed
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 Annealed — frequently asked
What is Pt95Ir5 Annealed used for?
Pt95Ir5 Annealed 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 Annealed?
Pt95Ir5 Annealed has a typical yield strength of 125 MPa (18.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 74% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ir5 Annealed easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% 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 Annealed 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 Annealed?
Electropolishing or diamond/alumina polishing yields a bright, biocompatible mirror surface; no plating or anodizing needed, and passivation is unnecessary.
Can Pt95Ir5 Annealed 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 Annealed?
Pt95Ir5 Annealed 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.