Ag75W25
ASTM B694
Ag75W25 is a sintered or silver-infiltrated silver-tungsten contact composite to ASTM B694, with about 25% tungsten dispersed in a silver matrix and supplied press-sintered-repressed, infiltrated, extruded or copper-backed.
Reference datasheet — Ag75W25 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 PSR condition
Ag75W25 grades and fills
Ag75W25 is supplied in 2 conditions, soft to hard. PSR is the default FabDigit quotes; the values on this page are for it.
Compare all 2 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
PSRDefault Pressed, sintered and re-pressed | Standard low-cost route for low/medium W contents such as AgW25; balanced conductivity, density ≥98 % theoretical. | 160 | 240 | 8 | |
Tungsten skeleton infiltrated with molten silver | Pick when maximum density, minimum porosity and best arc-erosion consistency are required (heavier-duty switching, oil/SF6 use). | 185 | 270 | 5 |
Supply forms, finishes and certifications
Ways Ag75W25 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EXT | Hot-extruded / worked semi-finished | Supply form |
BKD | With brazable backing layer | Surface finish |
What is Ag75W25?
Ag75W25 is a sintered or silver-infiltrated silver-tungsten contact composite to ASTM B694, with about 25% tungsten dispersed in a silver matrix and supplied press-sintered-repressed, infiltrated, extruded or copper-backed. It gives low contact resistance with useful arc and wear resistance: 320 W/m·K, 240 MPa tensile, 8% elongation and 11.75 g/cm³, mainly as contact tips, blanks and rod. Silver content sets the cost, the surface tarnishes in storage, and it is not a weldable structural material. W75Cu25 is the alternative for higher-voltage duty where silver cost is prohibitive. Ag75W25 has a density of 11.75 g/cm³ (0.424 lb/in³), heavier than 99% of composite grades. Ag75W25 has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 63% of composite grades. Elongation at break is 8% and the elastic modulus is 115 GPa (16.7 Msi).
What is Ag75W25 used for?
- relay contacts
- circuit breaker contacts
- contactor tips
Advantages
- Conducts heat well — 320 W/m·K (184.9 BTU/hr·ft·°F), better than 98% of composite grades
- Good UV / weathering resistance — 100/100, better than 93% of composite grades
- Ductile — tolerates forming and impact — 8%, better than 90% of composite grades
- Polishes to a fine finish — 60/100, better than 90% of composite grades
- Tough — resists crack growth — 25 MPa·√m (22.8 ksi·√in), better than 80% of composite grades
Limitations
- Heavy — 11.75 g/cm³ (0.424 lb/in³), worse than 99% of composite grades
- High embodied carbon — 78 kg CO₂/kg, worse than 97% of composite grades
Ag75W25 properties
Typical room-temperature values for Ag75W25-PSR; bars are the position among composite grades.
Physical1
Ag75W25 has a density of 11.75 g/cm³ (0.424 lb/in³), heavier than 99% of composite grades.
Mechanical11
Ag75W25 has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 63% of composite grades. Elongation at break is 8% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal5
Ag75W25 is rated for continuous service to 400°C (752 °F). It conducts heat at 320 W/m·K (184.9 BTU/hr·ft·°F), better than 98% of composite grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical1
Ag75W25 has an electrical resistivity of 2.2×10⁻⁸ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 64% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of Ag75W25 takes about 1,200 MJ of energy and emits 78 kg of CO₂ — more than 97% of composite grades. Typical recycled content is 40%.
Manufacturability2
Ag75W25's machinability is fair (35/100, better than 50% of composite grades).
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 composite family
Yield strength against density for every composite grade FabDigit runs. Ag75W25 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ag75W25
Is Ag75W25 easy to machine?
Machinable with sharp carbide or PCD tooling at moderate speed and generous coolant; the W phase is abrasive and the Ag matrix smears, so grinding/EDM is common for finish faces.
Can Ag75W25 be welded?
Not fusion-weldable as a joint material; tips are resistance-welded or brazed (Ag-Cu-P / Ag-Cu-Zn filler) to copper or brass carriers, ideally via a silver backing layer.
Can Ag75W25 be formed, bent or molded?
Net-shape by die pressing plus sintering (optionally re-pressing or Ag infiltration); only limited hot extrusion/coining, no cold forming of thick sections.
Ag75W25 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 |
|---|---|---|
| Wtungsten phase (skeleton or dispersed particles) | 24 – 26 | 25 |
| Other (total impurities)residual Fe, Ni, Co, O from powders/sintering aids | ≤ 0.2 | |
| Agsilver matrix, min 99.95 % purity feedstock | ≥ 74 (balance) |
What surface finishes work on Ag75W25?
Contact face is ground/coined and normally left bare; carrier sides may be Ag or Ni plated, and anti-tarnish passivation is used for long-shelf-life parts.
Equivalent designations
Standards and trade names that resolve to Ag75W25 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B694
How much does Ag75W25 cost?
Ag75W25 is a high-cost composite ($$$$), 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.
Ag75W25 — frequently asked
What is Ag75W25 used for?
Ag75W25 is typically used for relay contacts, circuit breaker contacts and contactor tips. In short: low contact resistance; low-voltage switching grade; silver-cost limited.
What is the yield strength of Ag75W25?
Ag75W25 has a typical yield strength of 160 MPa (23.2 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 63% of composite grades. Strength varies by condition: see the 2 listed tempers.
Is Ag75W25 easy to machine?
Not especially — machinability is rated fair (35/100, better than 50% of composite grades). Machinable with sharp carbide or PCD tooling at moderate speed and generous coolant; the W phase is abrasive and the Ag matrix smears, so grinding/EDM is common for finish faces.
Can Ag75W25 be welded?
Not fusion-weldable as a joint material; tips are resistance-welded or brazed (Ag-Cu-P / Ag-Cu-Zn filler) to copper or brass carriers, ideally via a silver backing layer.
What surface finishes work on Ag75W25?
Contact face is ground/coined and normally left bare; carrier sides may be Ag or Ni plated, and anti-tarnish passivation is used for long-shelf-life parts.
Can Ag75W25 be formed, bent or molded?
Net-shape by die pressing plus sintering (optionally re-pressing or Ag infiltration); only limited hot extrusion/coining, no cold forming of thick sections.
What is the maximum service temperature of Ag75W25?
Ag75W25 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ag75W25 PSR and Ag75W25 INF?
PSR is the default condition — standard low-cost route for low/medium W contents such as AgW25; balanced conductivity, density ≥98 % theoretical. INF: pick when maximum density, minimum porosity and best arc-erosion consistency are required (heavier-duty switching, oil/SF6 use). Yield strength is 160 MPa in PSR versus 185 MPa in INF.
How much does Ag75W25 cost?
Ag75W25 is a high-cost composite ($$$$), 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
- ASTM B694 — Refractory Metal–Silver Composite Electrical Contact Material — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (electrical contact materials) — ASM International (1990)
- Data Book of Electrical Contacts (AgW contact material sheets) — DODUCO (2012)
- ASM Handbook Vol. 7 — Powder Metallurgy (infiltrated refractory-metal composites) — ASM International (2015)
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.