Precious Metal Pt95Rh5 gauze-O (Annealed)
Temper
also Pt-Rh gauze catalyst
Soft weaving/knitting stock and thermocouple-grade wire; pick when maximum ductility and formability are needed.
Values for the O condition
Other Pt95Rh5 gauze tempers and conditions
Pt95Rh5 gauze is listed in 3 conditions; see the grade overview at Pt95Rh5 gauze.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Soft weaving/knitting stock and thermocouple-grade wire; pick when maximum ductility and formability are needed. | 130 | 340 | 33 | 78 HB | — |
Half hard | Compromise temper for wire that must be handled/woven without kinking but still needs some spring and strength. | 380 | 500 | 10 | 110 HB | 9.5 % IACS |
Full hard | Maximum-strength as-drawn wire for weaving fine gauze and for spring/lead applications; anneals in service above ~800 °C. | 600 | 690 | 2 | 143 HB | 9.3 % IACS |
What is Pt95Rh5 gauze-O?
Pt95Rh5 gauze-O is Pt95Rh5 gauze in the O temper — soft weaving/knitting stock and thermocouple-grade wire; pick when maximum ductility and formability are needed. Pt95Rh5 gauze-O has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 72% of precious metal grades. Elongation at break is 33% and the elastic modulus is 180 GPa (26.1 Msi). Pt95Rh5 gauze-O has a density of 20.65 g/cm³ (0.746 lb/in³), heavier than 95% of precious metal grades. It melts at 1,785°C (3,245 °F).
Advantages
- High service temperature — 1,200°C (2,192 °F), better than 97% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- Readily welded — 85/100, better than 93% of precious metal grades
- Stiff — 180 GPa (26.1 Msi), better than 92% of precious metal grades
- Forms and bends easily — 95/100, better than 91% of precious metal grades
Limitations
- Heavy — 20.65 g/cm³ (0.746 lb/in³), worse than 95% of precious metal grades
- Difficult to machine — 25/100, worse than 94% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Poor heat conductor — 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 85% of precious metal grades
- Low electrical conductivity — 9.8 % IACS, worse than 80% of precious metal grades
Pt95Rh5 gauze-O properties
Typical room-temperature values for Pt95Rh5 gauze-O; 11 are specific to this condition. Other listed values are Pt95Rh5 gauze reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95Rh5 gauze-O has a density of 20.65 g/cm³ (0.746 lb/in³), heavier than 95% of precious metal grades. It melts at 1,785°C (3,245 °F).
Mechanical11
Pt95Rh5 gauze-O has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 72% of precious metal grades. Elongation at break is 33% and the elastic modulus is 180 GPa (26.1 Msi).
Thermal6
Pt95Rh5 gauze-O is rated for continuous service to 1,200°C (2,192 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 85% of precious metal grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Pt95Rh5 gauze-O conducts electricity at 9.8 % IACS, worse than 80% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (99/100), better than 93% of precious metal grades.
Sustainability4
Producing a kilogram of Pt95Rh5 gauze-O 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 60%.
Manufacturability8
Pt95Rh5 gauze-O's machinability is poor (25/100, worse than 94% of precious metal grades); weldability excellent (85/100); formability excellent (95/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Rh5 gauze-O
Is Pt95Rh5 gauze easy to machine?
Rarely machined; if required use sharp, high-rake carbide or diamond tools, light cuts and flood coolant to avoid smearing, and capture every chip and swarf for refining.
Can Pt95Rh5 gauze be welded?
Excellent — resistance spot, micro-TIG and laser welding are standard for edging gauze packs and joining wires; weld clean, oxide-free and away from base-metal contamination.
Can Pt95Rh5 gauze be formed, bent or molded?
Drawn to <0.06 mm wire and woven/knitted on precision looms; interanneal at 900–1100 °C in clean air or hydrogen-free atmosphere and avoid contact with graphite, Si, P or Pb-bearing tooling.
What surface finishes work on Pt95Rh5 gauze?
Used bare; degrease and acid-clean (HCl or hot dilute HNO₃) before installation, then thermally condition in the burner — no plating, painting or anodising is applicable.
Pt95Rh5 gauze 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 |
|---|---|---|
| Rhsolid-solution strengthener; raises melting point and creep strength | 4.5 – 5.5 | 5 |
| Other (total impurities)Fe, Pd, Ir, Ag, Cu, Si each typically <100 ppm; Pb, Bi, As, P strictly limited | ≤ 0.05 | 0.02 |
| Pttypically 99.95 % refined platinum base | ≥ 94.4 (balance) | — |
Pt95Rh5 gauze-O — frequently asked
What is Pt95Rh5 gauze-O used for?
Pt95Rh5 gauze-O is typically used for ammonia oxidation catalysis, nitric acid production and HCN (Andrussow process) catalysis. In short: standard ammonia oxidation catalyst; 950 °C service limit; woven from ultrafine wire.
What is the yield strength of Pt95Rh5 gauze-O?
Pt95Rh5 gauze-O has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 72% of precious metal grades. Strength varies by condition: see the 3 listed tempers.
Is Pt95Rh5 gauze-O easy to machine?
Not especially — machinability is rated poor (25/100, worse than 94% of precious metal grades). Rarely machined; if required use sharp, high-rake carbide or diamond tools, light cuts and flood coolant to avoid smearing, and capture every chip and swarf for refining.
Can Pt95Rh5 gauze-O be welded?
Yes — weldability is rated excellent (85/100). Excellent — resistance spot, micro-TIG and laser welding are standard for edging gauze packs and joining wires; weld clean, oxide-free and away from base-metal contamination.
What surface finishes work on Pt95Rh5 gauze-O?
Used bare; degrease and acid-clean (HCl or hot dilute HNO₃) before installation, then thermally condition in the burner — no plating, painting or anodising is applicable.
Can Pt95Rh5 gauze-O be formed, bent or molded?
Drawn to <0.06 mm wire and woven/knitted on precision looms; interanneal at 900–1100 °C in clean air or hydrogen-free atmosphere and avoid contact with graphite, Si, P or Pb-bearing tooling.
What is the maximum service temperature of Pt95Rh5 gauze-O?
Pt95Rh5 gauze-O is rated for continuous use to about 1,200°C (2,192 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Platinum-rhodium catalyst gauzes for nitric acid and HCN plants — Johnson Matthey (2023)
- Platinum and platinum alloys — physical and mechanical property data — Heraeus Precious Metals (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Precious Metals) — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Pt-Rh system) — ASM International (1992)
- Platinum Metals Review / Johnson Matthey Technology Review — ammonia oxidation catalyst gauze articles — Johnson Matthey (2018)
- ASTM B561 Standard Specification for Refined Platinum — ASTM International (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.