Precious Metal Pt95Ru5-H (Hardened)
Heat-treated state
ASTM B563
Use for wear-resistant electrical contacts, brushes and slip rings where maximum hardness matters more than ductility.
Values for the H condition
Other Pt95Ru5 tempers and conditions
Pt95Ru5 is listed in 6 conditions; see the grade overview at Pt95Ru5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault fully softened (recrystallised, ~900–1000 °C) | Default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery. | 175 | 380 | 34 | 124 HB | 5.6 % IACS |
investment / centrifugal cast jewellery and blanks | Condition of cast jewellery mountings and cast contact blanks before finishing; coarser grain, lower ductility than wrought. | 185 | 350 | 18 | 128 HB | 5.5 % IACS |
Quarter hard | Choose when moderate stiffness is needed but the part still has to be bent or crimped. | 380 | 500 | 15 | 157 HB | 5.5 % IACS |
Half hard | Standard condition for contact blades, clips and machined components needing clean chip formation. | 520 | 620 | 6 | 185 HB | 5.4 % IACS |
HThis page Hardened | Use for wear-resistant electrical contacts, brushes and slip rings where maximum hardness matters more than ductility. | 690 | 760 | 3 | 20 HRC | 5.3 % IACS |
Spring hard | Fine wire and strip for contact springs and probe elements requiring maximum elastic limit. | 780 | 830 | 1.5 | 23 HRC | 5.2 % IACS |
What is Pt95Ru5-H?
Pt95Ru5-H is Pt95Ru5 heat treated to H — use for wear-resistant electrical contacts, brushes and slip rings where maximum hardness matters more than ductility. Pt95Ru5-H has a yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 100% of precious metal grades. Elongation at break is 3% and the elastic modulus is 186 GPa (27 Msi). Pt95Ru5-H has a density of 20.67 g/cm³ (0.747 lb/in³), heavier than 95% of precious metal grades. It melts at 1,780°C (3,236 °F). Annealed is the default condition FabDigit quotes; H is available on request or by drawing note.
Advantages
- High strength — 690 MPa (100 ksi), better than 100% of precious metal grades
- Stiff — 186 GPa (27 Msi), better than 93% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- High service temperature — 500°C (932 °F), better than 79% of precious metal grades
Limitations
- Limited ductility — 3%, worse than 95% of precious metal grades
- Heavy — 20.67 g/cm³ (0.747 lb/in³), worse than 95% of precious metal grades
- Low electrical conductivity — 5.3 % IACS, worse than 95% of precious metal grades
- Limited formability — 25/100, worse than 95% of precious metal grades
- Poor heat conductor — 28.5 W/m·K (16.5 BTU/hr·ft·°F), worse than 94% of precious metal grades
Pt95Ru5-H properties
Typical room-temperature values for Pt95Ru5-H; 21 are specific to this condition. Other listed values are Pt95Ru5 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95Ru5-H has a density of 20.67 g/cm³ (0.747 lb/in³), heavier than 95% of precious metal grades. It melts at 1,780°C (3,236 °F).
Mechanical11
Pt95Ru5-H has a yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 100% of precious metal grades. Elongation at break is 3% and the elastic modulus is 186 GPa (27 Msi).
Thermal6
Pt95Ru5-H is rated for continuous service to 500°C (932 °F). It conducts heat at 28.5 W/m·K (16.5 BTU/hr·ft·°F), worse than 94% of precious metal grades. Thermal expansion is 9.1 µm/m·K (5.06 µin/in·°F).
Electrical3
Pt95Ru5-H conducts electricity at 5.3 % IACS, worse than 95% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (99/100), better than 93% of precious metal grades.
Sustainability4
Producing a kilogram of Pt95Ru5-H 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
Pt95Ru5-H's machinability is fair (45/100, better than 59% of precious metal grades); weldability good (65/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ru5-H
Is Pt95Ru5 easy to machine?
Soft and gummy when annealed — machine in 1/2-hard or harder temper with sharp, high-rake carbide or HSS tools, light feeds, generous coolant, and capture all swarf for refining.
Can Pt95Ru5 be welded?
Excellent for resistance, laser and micro-TIG welding without filler in clean argon; avoid contamination by Fe, Si, P, S and carbon which cause hot shortness.
Can Pt95Ru5 be formed, bent or molded?
Very ductile when annealed: deep draws, rolls to foil and draws to fine wire; interanneal at 900–1000 °C in air or argon after ~50–60 % reduction.
What surface finishes work on Pt95Ru5?
Takes a bright, durable mirror polish with successively finer diamond/alumina compounds; no plating or passivation needed, and rhodium plating is generally unnecessary.
Pt95Ru5 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 |
|---|---|---|
| Rusolid-solution hardener | 4.5 – 5.5 | 5 |
| Other (total impurities)Ir, Pd, Rh, Fe, Cu residuals | ≤ 0.15 | 0.05 |
| Pttypically 950 ‰ fineness for jewellery hallmarking | ≥ 94.5 (balance) | — |
Pt95Ru5-H — frequently asked
What is Pt95Ru5-H used for?
Pt95Ru5-H is typically used for fine jewelry, electrical contacts and corrosion-resistant fixtures. In short: lower-cost hardened platinum; most formable Pt950 grade; spring tempers available.
What is the yield strength of Pt95Ru5-H?
Pt95Ru5-H has a typical yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 100% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ru5-H easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Soft and gummy when annealed — machine in 1/2-hard or harder temper with sharp, high-rake carbide or HSS tools, light feeds, generous coolant, and capture all swarf for refining.
Can Pt95Ru5-H be welded?
Yes — weldability is rated good (65/100). Excellent for resistance, laser and micro-TIG welding without filler in clean argon; avoid contamination by Fe, Si, P, S and carbon which cause hot shortness.
What surface finishes work on Pt95Ru5-H?
Takes a bright, durable mirror polish with successively finer diamond/alumina compounds; no plating or passivation needed, and rhodium plating is generally unnecessary.
Can Pt95Ru5-H be formed, bent or molded?
Very ductile when annealed: deep draws, rolls to foil and draws to fine wire; interanneal at 900–1000 °C in air or argon after ~50–60 % reduction.
What is the maximum service temperature of Pt95Ru5-H?
Pt95Ru5-H 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 Pt95Ru5 Annealed and Pt95Ru5 Spring?
Annealed is the default condition — default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery. Spring: fine wire and strip for contact springs and probe elements requiring maximum elastic limit. Yield strength is 175 MPa in Annealed versus 780 MPa in Spring.
Sources
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials (precious metals section) — ASM International (1990)
- Platinum alloy technical data (Pt-Ru, Pt-Ir, Pt-Co series) — Johnson Matthey Noble Metals (2020)
- Platinum Metals Review — mechanical properties of platinum alloys — Johnson Matthey (2004)
- ASTM B563 — Palladium/precious-metal electrical contact alloy specification (cited alias) — ASTM International (2019)
- ASM Alloy Phase Diagram Database — Pt-Ru system — ASM International (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.