Precious Metal 90Ag-10SnO2
ASTM B735
90Ag-10SnO2 is a silver-tin oxide contact composite with about 10% SnO2 in a silver matrix, supplied to ASTM B735 in O, H2, H, PS and AGBK conditions.
Reference datasheet — 90Ag-10SnO2 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the O condition
90Ag-10SnO2 tempers and conditions
90Ag-10SnO2 is supplied in 4 conditions, soft to hard. O is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
pressed and sintered (single-pressed contact blocks, not extruded) | Low-cost net-shape blocks/tips for larger contactors; slightly porous, so strength and conductivity are below the extruded material. | 110 | 170 | 6 | 57 HB | 85 % IACS |
ODefault Annealed | Standard stock condition for stamping, riveting and cold heading of contact tips. | 130 | 240 | 18 | 62 HB | 95 % IACS |
1/2H | Compromise condition when tips must resist deformation under contact force but still be riveted. | 210 | 280 | 8 | 76 HB | 93 % IACS |
Hardened | Choose for high mechanical wear resistance and low deformation of the contact face; minimal further forming possible. | 280 | 330 | 3 | 95 HB | 91 % IACS |
Supply forms, finishes and certifications
Ways 90Ag-10SnO2 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
AGBK | Ag-backed bimetal tip/rivet | Surface finish |
What is 90Ag-10SnO2?
90Ag-10SnO2 is a silver-tin oxide contact composite with about 10% SnO2 in a silver matrix, supplied to ASTM B735 in O, H2, H, PS and AGBK conditions. It is used as a cadmium-free replacement for AgCdO in medium-duty switching, combining 95% IACS conductivity and 370 W/m·K thermal conductivity with adequate arc-erosion resistance; strip, wire, rivets and silver-backed tips are the usual forms. Tensile strength is 240 MPa at 62 HB with 18% elongation, modulus 90 GPa, and service to 300 °C. Where erosion loading is heavier, 88Ag-12SnO2 gives more oxide at the cost of ductility and conductivity. 90Ag-10SnO2 has a density of 9.95 g/cm³ (0.359 lb/in³), lighter than 67% of precious metal grades. It melts at 961°C (1,762 °F). 90Ag-10SnO2 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 72% of precious metal grades. Elongation at break is 18% and the elastic modulus is 90 GPa (13.1 Msi).
What is 90Ag-10SnO2 used for?
- relays
- switches
- low-voltage contactors
Advantages
- High electrical conductivity — 95 % IACS, better than 97% of precious metal grades
- Conducts heat well — 370 W/m·K (213.8 BTU/hr·ft·°F), better than 95% of precious metal grades
Limitations
- Hard to polish — 65/100, worse than 87% of precious metal grades
- Limited formability — 65/100, worse than 86% of precious metal grades
- Limited ductility — 18%, worse than 83% of precious metal grades
- Difficult to weld — 25/100, worse than 78% of precious metal grades
90Ag-10SnO2 properties
Typical room-temperature values for 90Ag-10SnO2-O; bars are the position among precious metal grades.
Physical3
90Ag-10SnO2 has a density of 9.95 g/cm³ (0.359 lb/in³), lighter than 67% of precious metal grades. It melts at 961°C (1,762 °F).
Mechanical11
90Ag-10SnO2 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 72% of precious metal grades. Elongation at break is 18% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
90Ag-10SnO2 is rated for continuous service to 300°C (572 °F). It conducts heat at 370 W/m·K (213.8 BTU/hr·ft·°F), better than 95% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
90Ag-10SnO2 conducts electricity at 95 % IACS, better than 97% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 61% of precious metal grades.
Sustainability4
Producing a kilogram of 90Ag-10SnO2 takes about 1,350 MJ of energy and emits 100 kg of CO₂ — less than 59% of precious metal grades. Typical recycled content is 40%.
Manufacturability7
90Ag-10SnO2's machinability is fair (45/100, better than 59% of precious metal grades); weldability poor (25/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the precious metal family
Yield strength against density for every precious metal grade FabDigit runs. 90Ag-10SnO2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 90Ag-10SnO2
Is 90Ag-10SnO2 easy to machine?
Machinable with sharp, polished-flute carbide tools and light feeds, but the Ag matrix smears and the SnO₂ is abrasive — most parts are made net-shape by heading or stamping rather than cut.
Can 90Ag-10SnO2 be welded?
Not fusion welded — the oxide segregates in a molten pool; tips are resistance-welded or induction-brazed through a fine-silver/copper backing layer.
Can 90Ag-10SnO2 be formed, bent or molded?
Supply soft (O) strip/wire for stamping, cold heading and riveting; interanneal at ~600–700 °C in air or inert gas, and expect lower ductility than pure silver.
90Ag-10SnO2 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 |
|---|---|---|
| SnO2fine dispersed tin oxide | 9 – 11 | 10 |
| Bi2O3+CuO+In2O3 (additives)wetting/erosion additives, producer-specific; may be absent | 0 – 1 | 0.4 |
| Agnominal 90 wt% silver, ≥99.95 % purity base powder | balance |
What surface finishes work on 90Ag-10SnO2?
Used bare; degrease and avoid sulfur-bearing packaging to prevent tarnish. Anti-tarnish coatings or Ag/Ni underplates are applied to the carrier, not the contact face.
Equivalent designations
Standards and trade names that resolve to Precious Metal 90Ag-10SnO2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B735
- Also called
- AgSnO2-10
How much does 90Ag-10SnO2 cost?
90Ag-10SnO2 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
90Ag-10SnO2 — frequently asked
What is 90Ag-10SnO2 used for?
90Ag-10SnO2 is typically used for relays, switches and low-voltage contactors. In short: highest-conductivity AgSnO2 grade; cadmium-free medium-duty contact; good balance of ductility.
What is the yield strength of 90Ag-10SnO2?
90Ag-10SnO2 has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 72% of precious metal grades. Strength varies by condition: see the 4 listed tempers.
Is 90Ag-10SnO2 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Machinable with sharp, polished-flute carbide tools and light feeds, but the Ag matrix smears and the SnO₂ is abrasive — most parts are made net-shape by heading or stamping rather than cut.
Can 90Ag-10SnO2 be welded?
Not readily — weldability is rated poor (25/100). Not fusion welded — the oxide segregates in a molten pool; tips are resistance-welded or induction-brazed through a fine-silver/copper backing layer.
What surface finishes work on 90Ag-10SnO2?
Used bare; degrease and avoid sulfur-bearing packaging to prevent tarnish. Anti-tarnish coatings or Ag/Ni underplates are applied to the carrier, not the contact face.
Can 90Ag-10SnO2 be formed, bent or molded?
Supply soft (O) strip/wire for stamping, cold heading and riveting; interanneal at ~600–700 °C in air or inert gas, and expect lower ductility than pure silver.
What is the maximum service temperature of 90Ag-10SnO2?
90Ag-10SnO2 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 90Ag-10SnO2-O and 90Ag-10SnO2-H?
O is the default condition — standard stock condition for stamping, riveting and cold heading of contact tips. H: choose for high mechanical wear resistance and low deformation of the contact face; minimal further forming possible. Yield strength is 130 MPa in O versus 280 MPa in H.
How much does 90Ag-10SnO2 cost?
90Ag-10SnO2 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- DODUCO Data Book of Electrical Contacts — DODUCO GmbH (2012)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Electrical Contact Materials) — ASM International (1990)
- Silver tin oxide AgSnO2 contact material data sheets — Umicore / Metalor / AMI Doduco (2022)
- IEC 60947-4-1 (contactor contact material practice) and related contact-material specifications — IEC (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.