Precious Metal Pt99.95 Sponge
Grade
UNS P00010 · ASTM B561
Sponge = sponge / powder
Pick as melting, catalyst or paste feedstock; mechanical properties do not apply until consolidated.
Values for the Sponge 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 |
SpongeThis page 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 |
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 Sponge?
Pt99.95 Sponge is Pt99.95 in the Sponge grade — pick as melting, catalyst or paste feedstock; mechanical properties do not apply until consolidated. Pt99.95 Sponge has a yield strength of 50 MPa (7.25 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 97% of precious metal grades. Elongation at break is 15% and the elastic modulus is 168 GPa (24.4 Msi). Pt99.95 Sponge 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; Sponge is available on request or by drawing note.
Advantages
- High service temperature — 1,500°C (2,732 °F), better than 99% of precious metal grades
- Readily welded — 90/100, better than 99% of precious metal grades
- Good corrosion resistance — 100/100, better than 98% of precious metal grades
- Stiff — 168 GPa (24.4 Msi), better than 89% of precious metal grades
Limitations
- Low strength — 50 MPa (7.25 ksi), worse than 97% of precious metal grades
- Heavy — 21.45 g/cm³ (0.775 lb/in³), worse than 97% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Limited ductility — 15%, worse than 86% of precious metal grades
- Difficult to machine — 30/100, worse than 86% of precious metal grades
Pt99.95 Sponge properties
Typical room-temperature values for Pt99.95 Sponge; 15 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 Sponge 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 Sponge has a yield strength of 50 MPa (7.25 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 97% of precious metal grades. Elongation at break is 15% and the elastic modulus is 168 GPa (24.4 Msi).
Thermal6
Pt99.95 Sponge is rated for continuous service to 1,500°C (2,732 °F). It conducts heat at 71.6 W/m·K (41.4 BTU/hr·ft·°F), worse than 61% of precious metal grades. Thermal expansion is 8.8 µm/m·K (4.89 µin/in·°F).
Electrical3
Pt99.95 Sponge conducts electricity at 16.3 % IACS, worse than 58% 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 Sponge 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 Sponge's machinability is poor (30/100, worse than 86% of precious metal grades); weldability excellent (90/100); formability excellent (90/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt99.95 Sponge
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 Sponge — frequently asked
What is Pt99.95 Sponge used for?
Pt99.95 Sponge 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 Sponge?
Pt99.95 Sponge has a typical yield strength of 50 MPa (7.25 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 97% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt99.95 Sponge easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% 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 Sponge be welded?
Yes — weldability is rated excellent (90/100). 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 Sponge?
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 Sponge 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 Sponge?
Pt99.95 Sponge is rated for continuous use to about 1,500°C (2,732 °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.