Precious Metal Pt95Ir5-H04
Supply condition
ASTM B562
H04 = full hard
Choose for maximum strength and wear resistance in straight wire, probes and stiff electrode shafts.
Values for the H04 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 |
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 |
H04This page 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-H04?
Pt95Ir5-H04 is Pt95Ir5 supplied in the H04 condition — choose for maximum strength and wear resistance in straight wire, probes and stiff electrode shafts. Pt95Ir5-H04 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 97% of precious metal grades. Elongation at break is 3% and the elastic modulus is 176 GPa (25.5 Msi). Pt95Ir5-H04 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; H04 is available on request or by drawing note.
Advantages
- High strength — 470 MPa (68.2 ksi), better than 97% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- Stiff — 176 GPa (25.5 Msi), better than 92% of precious metal grades
- Readily welded — 78/100, better than 84% of precious metal grades
- High service temperature — 500°C (932 °F), better than 79% of precious metal grades
Limitations
- Heavy — 21.5 g/cm³ (0.777 lb/in³), worse than 98% of precious metal grades
- Limited ductility — 3%, worse than 95% of precious metal grades
- Limited formability — 30/100, worse than 94% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Low electrical conductivity — 8.6 % IACS, worse than 85% of precious metal grades
Pt95Ir5-H04 properties
Typical room-temperature values for Pt95Ir5-H04; 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-H04 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-H04 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 97% of precious metal grades. Elongation at break is 3% and the elastic modulus is 176 GPa (25.5 Msi).
Thermal6
Pt95Ir5-H04 is rated for continuous service to 500°C (932 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 84% of precious metal grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Pt95Ir5-H04 conducts electricity at 8.6 % IACS, worse than 85% 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-H04 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-H04's machinability is fair (40/100, worse than 60% of precious metal grades); weldability very good (78/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ir5-H04
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-H04 — frequently asked
What is Pt95Ir5-H04 used for?
Pt95Ir5-H04 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-H04?
Pt95Ir5-H04 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 97% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ir5-H04 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% 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-H04 be welded?
Yes — weldability is rated very good (78/100). 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-H04?
Electropolishing or diamond/alumina polishing yields a bright, biocompatible mirror surface; no plating or anodizing needed, and passivation is unnecessary.
Can Pt95Ir5-H04 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-H04?
Pt95Ir5-H04 is rated for continuous use to about 500°C (932 °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.