Precious Metal AgSnO2In2O3-IO (AgSnO2In2O3)
Grade
Internally oxidised route gives an ultrafine oxide dispersion, higher hardness and lower contact resistance for demanding AC contactors.
Values for the IO condition
Other AgSnO2In2O3 tempers and conditions
AgSnO2In2O3 is listed in 6 conditions; see the grade overview at AgSnO2In2O3.
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 |
IOThis page 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 |
What is AgSnO2In2O3-IO?
AgSnO2In2O3-IO is AgSnO2In2O3 in the IO grade — internally oxidised route gives an ultrafine oxide dispersion, higher hardness and lower contact resistance for demanding AC contactors. AgSnO2In2O3-IO has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of precious metal grades. Elongation at break is 6% and the elastic modulus is 92 GPa (13.3 Msi). AgSnO2In2O3-IO has a density of 9.98 g/cm³ (0.361 lb/in³), lighter than 65% of precious metal grades. It melts at 960°C (1,760 °F). 90/10 EXT is the default condition FabDigit quotes; IO is available on request or by drawing note.
Advantages
- Conducts heat well — 330 W/m·K (190.7 BTU/hr·ft·°F), better than 84% of precious metal grades
- High electrical conductivity — 68 % IACS, better than 75% of precious metal grades
Limitations
- Limited ductility — 6%, worse than 93% of precious metal grades
- Limited formability — 35/100, worse than 92% of precious metal grades
- Hard to polish — 60/100, worse than 92% of precious metal grades
- Difficult to weld — 25/100, worse than 78% of precious metal grades
AgSnO2In2O3-IO properties
Typical room-temperature values for AgSnO2In2O3-IO; 21 are specific to this condition. Other listed values are AgSnO2In2O3 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
AgSnO2In2O3-IO has a density of 9.98 g/cm³ (0.361 lb/in³), lighter than 65% of precious metal grades. It melts at 960°C (1,760 °F).
Mechanical10
AgSnO2In2O3-IO has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of precious metal grades. Elongation at break is 6% and the elastic modulus is 92 GPa (13.3 Msi).
Thermal6
AgSnO2In2O3-IO is rated for continuous service to 280°C (536 °F). It conducts heat at 330 W/m·K (190.7 BTU/hr·ft·°F), better than 84% of precious metal grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
AgSnO2In2O3-IO conducts electricity at 68 % IACS, better than 75% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 66% of precious metal grades.
Sustainability4
Producing a kilogram of AgSnO2In2O3-IO 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-IO's machinability is fair (35/100, worse than 73% of precious metal grades); weldability poor (25/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with AgSnO2In2O3-IO
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.
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.
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 | — |
AgSnO2In2O3-IO — frequently asked
What is AgSnO2In2O3-IO used for?
AgSnO2In2O3-IO 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-IO?
AgSnO2In2O3-IO has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is AgSnO2In2O3-IO easy to machine?
Not especially — machinability is rated fair (35/100, worse than 73% 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-IO be welded?
Not readily — weldability is rated poor (25/100). 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-IO?
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-IO 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-IO?
AgSnO2In2O3-IO is rated for continuous use to about 280°C (536 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.