Precious Metal AgSnO2In2O3
Indium-oxide-modified silver tin-oxide contact material with improved sinterability and lower contact resistance than plain Ag-SnO2, widely replacing Ag-CdO in automotive relays and breakers for environmental reasons.
Reference datasheet — AgSnO2In2O3 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 90/10 EXT condition
AgSnO2In2O3 tempers and conditions
AgSnO2In2O3 is supplied in 6 conditions, soft to hard. 90/10 EXT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AgSnO2In2O3 90/10 | Use for riveting, heavy upsetting or cold forming of tips where ductility is needed before final work hardening. | 110 | 210 | 20 | 66 HB | 68 % IACS |
P/M pressed–sintered–repressed compact | Net-shape sintered tips for larger contactor blocks where extrusion of a billet is uneconomic. | 170 | 240 | 6 | 80 HB | 62 % IACS |
AgSnO2In2O3 92/8 | Choose for low contact resistance and low temperature rise in small relays with moderate arcing duty. | 180 | 255 | 12 | 82 HV | 72 % IACS |
90/10 EXTDefault AgSnO2In2O3 90/10 | The everyday balance of arc erosion resistance, conductivity and workability for relay and contactor tips. | 205 | 280 | 9 | 95 HV | 66 % IACS |
AgSnO2In2O3 88/12 | Pick when weld resistance and erosion life under high make currents matter more than temperature rise. | 225 | 300 | 7 | 105 HV | 60 % IACS |
AgSnO2In2O3 | Internally oxidised route gives an ultrafine oxide dispersion, higher hardness and lower contact resistance for demanding AC contactors. | 240 | 310 | 6 | 104 HB | 68 % IACS |
Supply forms, finishes and certifications
Ways AgSnO2In2O3 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
AG-BACK | Ag-backed / bimetal contact | Surface finish |
What is AgSnO2In2O3?
Indium-oxide-modified silver tin-oxide contact material with improved sinterability and lower contact resistance than plain Ag-SnO2, widely replacing Ag-CdO in automotive relays and breakers for environmental reasons. AgSnO2In2O3 has a density of 9.95 g/cm³ (0.359 lb/in³), lighter than 67% of precious metal grades. It melts at 960°C (1,760 °F). AgSnO2In2O3 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 280 MPa (40.6 ksi) — stronger than 57% of precious metal grades. Elongation at break is 9% and the elastic modulus is 88 GPa (12.8 Msi).
What is AgSnO2In2O3 used for?
- automotive relays
- low-voltage circuit breakers
- contactors
- AC/DC power relays
Advantages
- Conducts heat well — 320 W/m·K (184.9 BTU/hr·ft·°F), better than 80% of precious metal grades
Limitations
- Hard to polish — 60/100, worse than 92% of precious metal grades
- Limited ductility — 9%, worse than 91% of precious metal grades
- Limited formability — 45/100, worse than 91% of precious metal grades
AgSnO2In2O3 properties
Typical room-temperature values for AgSnO2In2O3-90/10 EXT; bars are the position among precious metal grades.
Physical3
AgSnO2In2O3 has a density of 9.95 g/cm³ (0.359 lb/in³), lighter than 67% of precious metal grades. It melts at 960°C (1,760 °F).
Mechanical10
AgSnO2In2O3 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 280 MPa (40.6 ksi) — stronger than 57% of precious metal grades. Elongation at break is 9% and the elastic modulus is 88 GPa (12.8 Msi).
Thermal6
AgSnO2In2O3 is rated for continuous service to 250°C (482 °F). It conducts heat at 320 W/m·K (184.9 BTU/hr·ft·°F), better than 80% of precious metal grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
AgSnO2In2O3 conducts electricity at 66 % IACS, better than 74% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 61% of precious metal grades.
Sustainability4
Producing a kilogram of AgSnO2In2O3 takes about 1,500 MJ of energy and emits 130 kg of CO₂ — more than 51% of precious metal grades. Typical recycled content is 40%.
Manufacturability6
AgSnO2In2O3's machinability is fair (40/100, worse than 60% of precious metal grades); weldability poor (30/100); formability fair (45/100).
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. AgSnO2In2O3 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AgSnO2In2O3
Is AgSnO2In2O3 easy to machine?
Machinable with sharp carbide or PCD tooling and generous coolant; the SnO2/In2O3 dispersion is abrasive while the Ag matrix smears, so light finishing cuts and frequent edge changes are needed.
Can AgSnO2In2O3 be welded?
Not fusion welded — tips are resistance-welded or induction/torch brazed through a fine-silver or AgCu backing layer using Ag-Cu-P or BAg filler at low heat input.
Can AgSnO2In2O3 be formed, bent or molded?
Supplied as extruded wire/strip from sintered billets; cold heading, upsetting and profile rolling are routine, but deep drawing and sharp bends are limited by the low elongation of high-oxide grades.
AgSnO2In2O3 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 |
|---|---|---|
| SnO2dispersed oxide phase; 8 wt% for the 90/10 default | 6 – 13 | 8 |
| In2O3wetting/sintering modifier, sometimes with traces of Bi2O3 or CuO | 1 – 4 | 2 |
| Ag≥ 99.95 % purity silver matrix | balance |
What surface finishes work on AgSnO2In2O3?
Used bare; contact faces are coined or turned rather than plated, and any tarnish film is normally cleared by the first arcing operations.
How much does AgSnO2In2O3 cost?
AgSnO2In2O3 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.
AgSnO2In2O3 — frequently asked
What is AgSnO2In2O3 used for?
AgSnO2In2O3 is typically used for automotive relays, low-voltage circuit breakers, contactors and AC/DC power relays. In short: cadmium-free Ag-CdO replacement; low contact resistance oxide grade; abrasive to cutting tools.
What is the yield strength of AgSnO2In2O3?
AgSnO2In2O3 has a typical yield strength of 205 MPa (29.7 ksi) and a tensile strength of 280 MPa (40.6 ksi) — stronger than 57% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is AgSnO2In2O3 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% of precious metal grades). Machinable with sharp carbide or PCD tooling and generous coolant; the SnO2/In2O3 dispersion is abrasive while the Ag matrix smears, so light finishing cuts and frequent edge changes are needed.
Can AgSnO2In2O3 be welded?
Not readily — weldability is rated poor (30/100). Not fusion welded — tips are resistance-welded or induction/torch brazed through a fine-silver or AgCu backing layer using Ag-Cu-P or BAg filler at low heat input.
What surface finishes work on AgSnO2In2O3?
Used bare; contact faces are coined or turned rather than plated, and any tarnish film is normally cleared by the first arcing operations.
Can AgSnO2In2O3 be formed, bent or molded?
Supplied as extruded wire/strip from sintered billets; cold heading, upsetting and profile rolling are routine, but deep drawing and sharp bends are limited by the low elongation of high-oxide grades.
What is the maximum service temperature of AgSnO2In2O3?
AgSnO2In2O3 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AgSnO2In2O3 90/10 EXT and AgSnO2In2O3-IO?
90/10 EXT is the default condition — the everyday balance of arc erosion resistance, conductivity and workability for relay and contactor tips. IO: internally oxidised route gives an ultrafine oxide dispersion, higher hardness and lower contact resistance for demanding AC contactors. Yield strength is 205 MPa in 90/10 EXT versus 240 MPa in IO.
How much does AgSnO2In2O3 cost?
AgSnO2In2O3 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
- Data Book of Electrical Contacts — DODUCO / AMI Doduco (2012)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (electrical contact materials) — ASM International (1990)
- Silver metal oxide contact materials product data — Metalor Technologies (2022)
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.