Precious Metal Britannia Silver (958) vs IC-Ag99.99
Precious Metal · grade comparison
Precious Metal Britannia Silver (958) and IC-Ag99.99 are both precious metal grades. Britannia Silver (958) is the stronger of the two: yield strength 60 MPa (8.7 ksi) against 45 MPa (6.53 ksi) for IC-Ag99.99, about 33% more; tensile strength follows at 240 MPa (34.8 ksi) vs 140 MPa (20.3 ksi). Britannia Silver (958) is harder — 47 HB against 25 HB for IC-Ag99.99 — which matters for wear surfaces and threads. IC-Ag99.99 runs hotter in service (500°C vs 200°C continuous) and IC-Ag99.99 conducts heat better (429 W/m·K vs 385 W/m·K).
Britannia Silver (958)Choose it when strength drives the design, or when surface hardness matters.
IC-Ag99.99Choose it when the part sees heat.
Britannia Silver (958) vs IC-Ag99.99: 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.
Britannia Silver (958)IC-Ag99.99
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Reduction in Area
Same in both: Elastic (Young's) Modulus 76 GPa11 Msi · Poisson's Ratio 0.37
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 105 J/g45.1 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Same in both: Corrosion Resistance 78 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Castability
Polishability
Same in both: Machinability 45 / 100 · Formability (cold) 98 / 100 · Brazeability / Solderability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 1,500 MJ/kg644,885 BTU/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | Britannia Silver (958) | IC-Ag99.99 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Britannia Silver (958) vs IC-Ag99.99 — frequently asked
Is Britannia Silver (958) stronger than IC-Ag99.99?
Yes. Britannia Silver (958) has a typical yield strength of 60 MPa (8.7 ksi) against 45 MPa (6.53 ksi) for IC-Ag99.99 — about 33% more. Tensile strength is 240 MPa (34.8 ksi) vs 140 MPa (20.3 ksi).
Which is cheaper, Britannia Silver (958) or IC-Ag99.99?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, Britannia Silver (958) or IC-Ag99.99?
Britannia Silver (958). Its weldability rates very good (70/100) against good (65/100) for IC-Ag99.99.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Britannia Silver (958) and IC-Ag99.99 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.