Precious Metal Pt95Ru5
ASTM B563
Pt95Ru5 is a 950-fine platinum alloy solid-solution hardened with 5 % ruthenium, supplied under the B563 designation family.
Reference datasheet — Pt95Ru5 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 Annealed condition
Pt95Ru5 tempers and conditions
Pt95Ru5 is supplied in 6 conditions, soft to hard. Annealed 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 |
|---|---|---|---|---|---|---|
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 |
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?
Pt95Ru5 is a 950-fine platinum alloy solid-solution hardened with 5 % ruthenium, supplied under the B563 designation family. It reaches 124 HB and 380 MPa tensile with 175 MPa yield and 34 % elongation annealed, at lower alloying cost than iridium-hardened platinum, and is stocked as sheet, wire, tube and castings in annealed, 1/4H, 1/2H, H, spring and as-cast conditions. The limits are low electrical conductivity (5.6 % IACS), poor machinability (score 30) and precious-metal cost. Pt95Co5 is the nearest alternative when castability matters more than work-hardening response. Pt95Ru5 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). Pt95Ru5 has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Elongation at break is 34% and the elastic modulus is 186 GPa (27 Msi).
What is Pt95Ru5 used for?
- Fine jewelry
- Electrical contacts
- Corrosion-resistant fixtures
Advantages
- Stiff — 186 GPa (27 Msi), better than 93% of precious metal grades
- High service temperature — 900°C (1,652 °F), better than 93% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- Readily welded — 80/100, better than 87% of precious metal grades
- Ductile — tolerates forming and impact — 34%, better than 78% of precious metal grades
Limitations
- Heavy — 20.67 g/cm³ (0.747 lb/in³), worse than 95% of precious metal grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 94% of precious metal grades
- Low electrical conductivity — 5.6 % IACS, worse than 93% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Difficult to machine — 30/100, worse than 86% of precious metal grades
Pt95Ru5 properties
Typical room-temperature values for Pt95Ru5-Annealed; bars are the position among precious metal grades.
Physical3
Pt95Ru5 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 has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Elongation at break is 34% and the elastic modulus is 186 GPa (27 Msi).
Thermal6
Pt95Ru5 is rated for continuous service to 900°C (1,652 °F). It conducts heat at 30 W/m·K (17.3 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 conducts electricity at 5.6 % IACS, worse than 93% 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 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's machinability is poor (30/100, worse than 86% of precious metal grades); weldability very good (80/100); formability excellent (85/100).
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. Pt95Ru5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pt95Ru5
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to Precious Metal Pt95Ru5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B563
- Also called
- PtRu5
How much does Pt95Ru5 cost?
Pt95Ru5 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.
Pt95Ru5 — frequently asked
What is Pt95Ru5 used for?
Pt95Ru5 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?
Pt95Ru5 has a typical yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ru5 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% 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 be welded?
Yes — weldability is rated very good (80/100). 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?
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 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?
Pt95Ru5 is rated for continuous use to about 900°C (1,652 °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.
How much does Pt95Ru5 cost?
Pt95Ru5 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 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; 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.