Precious Metal Pt99.95-H08
Supply condition
UNS P00010 · ASTM B561
H08 = spring hard
Pick for fine spring wire, anode hooks and stiff probe wire where recrystallisation (≈500–600 °C) will not occur in service.
Values for the H08 condition
Other Pt99.95 tempers and conditions
Pt99.95 is listed in 6 conditions; see the grade overview at Pt99.95.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault fully recrystallised sheet, foil, wire, crucible stock | Default stock condition: maximum ductility for deep drawing, crucible spinning, foil rolling and thermocouple/RTD wire. | 45 | 140 | 40 | 39 HB | 16.3 % IACS |
As fabricated | Pick for melt-stock ingot, anodes and jewellery/laboratory castings where coarse grain and low strength are acceptable. | 45 | 130 | 25 | 40 HB | 16.2 % IACS |
Sponge / powder | Pick as melting, catalyst or paste feedstock; mechanical properties do not apply until consolidated. | 50 | 110 | 15 | 42 HB | 16.3 % IACS |
Half hard | Pick when handling stiffness or moderate spring is needed in strip, contact and electrode parts that still require some bending. | 150 | 195 | 10 | 72 HB | 16.1 % IACS |
Full hard | Pick for maximum strength and wear resistance in strip, gauze wire and contacts that see no service above ~200 °C. | 195 | 225 | 3 | 95 HB | 15.9 % IACS |
H08This page Spring hard | Pick for fine spring wire, anode hooks and stiff probe wire where recrystallisation (≈500–600 °C) will not occur in service. | 230 | 255 | 2 | 103 HB | 15.8 % IACS |
What is Pt99.95-H08?
Pt99.95-H08 is Pt99.95 supplied in the H08 condition — pick for fine spring wire, anode hooks and stiff probe wire where recrystallisation (≈500–600 °C) will not occur in service. Pt99.95-H08 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 70% of precious metal grades. Elongation at break is 2% and the elastic modulus is 172 GPa (24.9 Msi). Pt99.95-H08 has a density of 21.45 g/cm³ (0.775 lb/in³), heavier than 97% of precious metal grades. It melts at 1,768°C (3,214 °F). Annealed is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 100/100, better than 98% of precious metal grades
- Stiff — 172 GPa (24.9 Msi), better than 90% of precious metal grades
- Readily welded — 78/100, better than 84% of precious metal grades
Limitations
- Limited ductility — 2%, worse than 98% of precious metal grades
- Heavy — 21.45 g/cm³ (0.775 lb/in³), worse than 97% of precious metal grades
- Limited formability — 20/100, worse than 96% of precious metal grades
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
Pt99.95-H08 properties
Typical room-temperature values for Pt99.95-H08; 20 are specific to this condition. Other listed values are Pt99.95 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt99.95-H08 has a density of 21.45 g/cm³ (0.775 lb/in³), heavier than 97% of precious metal grades. It melts at 1,768°C (3,214 °F).
Mechanical11
Pt99.95-H08 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 70% of precious metal grades. Elongation at break is 2% and the elastic modulus is 172 GPa (24.9 Msi).
Thermal6
Pt99.95-H08 is rated for continuous service to 200°C (392 °F). It conducts heat at 69.5 W/m·K (40.2 BTU/hr·ft·°F), worse than 65% of precious metal grades. Thermal expansion is 8.8 µm/m·K (4.89 µin/in·°F).
Electrical3
Pt99.95-H08 conducts electricity at 15.8 % IACS, worse than 62% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (100/100), better than 98% of precious metal grades.
Sustainability4
Producing a kilogram of Pt99.95-H08 takes about 210,000 MJ of energy and emits 14,000 kg of CO₂ — more than 88% of precious metal grades. Typical recycled content is 30%.
Manufacturability8
Pt99.95-H08's machinability is fair (35/100, worse than 73% of precious metal grades); weldability very good (78/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt99.95-H08
Is Pt99.95 easy to machine?
Very gummy and smearing — use sharp uncoated carbide or HSS with high positive rake, light depth, high speed and copious lubricant; collect all swarf and coolant for refining.
Can Pt99.95 be welded?
Autogenous TIG, plasma, laser or oxy-hydrogen welding gives full-strength joints without filler; keep the flame oxidising and the work free of Pb/Si/S contamination to avoid grain-boundary embrittlement.
Can Pt99.95 be formed, bent or molded?
Outstanding cold formability — deep draws, spins into crucibles and rolls to sub-10 µm foil; anneal at 900–1000 °C between heavy reductions and avoid contact with steel dies that can transfer iron.
What surface finishes work on Pt99.95?
Electropolish or diamond/alumina polish to a mirror; flame-clean laboratory ware in an oxidising flame; electrodes may be platinised (Pt black) rather than plated or coated.
Pt99.95 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.
| Element | Spec limit (wt %) |
|---|---|
| Pdtypical refiner limit | ≤ 0.02 |
| Rh | ≤ 0.02 |
| Ir | ≤ 0.02 |
| Ru | ≤ 0.01 |
| Au | ≤ 0.01 |
| Ag | ≤ 0.01 |
| Fe | ≤ 0.01 |
| Cu | ≤ 0.01 |
| Siembrittling; kept low | ≤ 0.01 |
| Pbstrongly embrittling | ≤ 0 |
| Pt≥99.95 wt %; total impurities ≤0.05 wt % per ASTM B561 refined platinum | ≥ 99.95 (balance) |
Pt99.95-H08 — frequently asked
What is Pt99.95-H08 used for?
Pt99.95-H08 is typically used for laboratory crucibles, standard weights, electrodes, sputtering targets and base for alloying. In short: purest platinum mill stock; best-forming precious metal; 1500 °C service capability.
What is the yield strength of Pt99.95-H08?
Pt99.95-H08 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 70% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt99.95-H08 easy to machine?
Not especially — machinability is rated fair (35/100, worse than 73% of precious metal grades). Very gummy and smearing — use sharp uncoated carbide or HSS with high positive rake, light depth, high speed and copious lubricant; collect all swarf and coolant for refining.
Can Pt99.95-H08 be welded?
Yes — weldability is rated very good (78/100). Autogenous TIG, plasma, laser or oxy-hydrogen welding gives full-strength joints without filler; keep the flame oxidising and the work free of Pb/Si/S contamination to avoid grain-boundary embrittlement.
What surface finishes work on Pt99.95-H08?
Electropolish or diamond/alumina polish to a mirror; flame-clean laboratory ware in an oxidising flame; electrodes may be platinised (Pt black) rather than plated or coated.
Can Pt99.95-H08 be formed, bent or molded?
Outstanding cold formability — deep draws, spins into crucibles and rolls to sub-10 µm foil; anneal at 900–1000 °C between heavy reductions and avoid contact with steel dies that can transfer iron.
What is the maximum service temperature of Pt99.95-H08?
Pt99.95-H08 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Pt99.95 Annealed and Pt99.95-H08?
Annealed is the default condition — default stock condition: maximum ductility for deep drawing, crucible spinning, foil rolling and thermocouple/RTD wire. H08: pick for fine spring wire, anode hooks and stiff probe wire where recrystallisation (≈500–600 °C) will not occur in service. Yield strength is 45 MPa in Annealed versus 230 MPa in H08.
Sources
- ASTM B561 — Standard Specification for Refined Platinum — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Precious Metals) — ASM International (1990)
- CRC Handbook of Chemistry and Physics — thermophysical data for platinum — CRC Press (2022)
- Platinum laboratory ware and PGM semi-finished products data — Heraeus / Johnson Matthey (2023)
- IEC 60751 — Industrial platinum resistance thermometers (Pt resistivity reference) — IEC (2022)
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.