Precious Metal 85Pt-15Ir 1/2H vs 85Pt-15Ir-O
Precious Metal · 85Pt-15Ir temper comparison
85Pt-15Ir 1/2H and 85Pt-15Ir-O are two conditions of the same precious metal grade, 85Pt-15Ir: 1/2H (half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 85Pt-15Ir 1/2H is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 200 MPa (29 ksi) for 85Pt-15Ir-O, about 150% more; tensile strength follows at 700 MPa (102 ksi) vs 480 MPa (69.6 ksi). In exchange, 85Pt-15Ir-O is the more ductile: elongation 27% versus 8% for 85Pt-15Ir 1/2H, and 85Pt-15Ir 1/2H is harder (230 HV vs 160 HV). 85Pt-15Ir-O runs hotter in service (1,000°C vs 500°C continuous).
85Pt-15Ir 1/2HChoose it when strength drives the design.
85Pt-15Ir-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
85Pt-15Ir 1/2H vs 85Pt-15Ir-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 255 GPa37 Msi · Poisson's Ratio 0.38 · Shear Strength 300 MPa43.5 ksi · Hardness, Rockwell B 84 HRB
Physical
Density and transition temperatures.
Same in both: Density 21.6 g/cm³0.78 lb/in³ · Melting Point (Solidus) 1,790°C3,254 °F · Liquidus Temperature 1,825°C3,317 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 26 W/m·K15 BTU/hr·ft·°F · Specific Heat Capacity 131 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 8.6 µm/m·K4.8 µin/in·°F · Latent Heat of Fusion 122 J/g52.5 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) 0.25 V · Corrosion Resistance 100 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Castability 35 / 100 · Brazeability / Solderability 70 / 100 · Polishability 92 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 260,000 MJ/kg1.12×10⁸ BTU/lb · Embodied Carbon (primary production) 16,000 kg CO₂/kg · Embodied Water 250,000 L/kg29,957 gal/lb · Typical Recycled Content 40%
Strength versus weight
Yield strength against density for every precious metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
85Pt-15Ir 1/2H vs 85Pt-15Ir-O — frequently asked
Is 85Pt-15Ir 1/2H stronger than 85Pt-15Ir-O?
Yes. 85Pt-15Ir 1/2H has a typical yield strength of 500 MPa (72.5 ksi) against 200 MPa (29 ksi) for 85Pt-15Ir-O — about 150% more. Tensile strength is 700 MPa (102 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, 1/2H or O?
O is the default 85Pt-15Ir condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 85Pt-15Ir 1/2H or 85Pt-15Ir-O?
85Pt-15Ir 1/2H, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for 85Pt-15Ir-O; for welding the order is 85Pt-15Ir-O first (very good, 70/100) then 85Pt-15Ir 1/2H (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 85Pt-15Ir 1/2H and 85Pt-15Ir-O side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.