Ag75W25 PSR
Other · default condition
ASTM B694
PSR = pressed, sintered and re-pressed
Standard low-cost route for low/medium W contents such as AgW25; balanced conductivity, density ≥98 % theoretical.
Values for the PSR condition
Other Ag75W25 grades and fills
Ag75W25 is listed in 2 conditions; see the grade overview at Ag75W25.
- PSR
- INF
Compare all 2 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
PSRDefaultThis page 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 | — |
What is Ag75W25 PSR?
Ag75W25 PSR is Ag75W25 in the PSR condition — standard low-cost route for low/medium W contents such as AgW25; balanced conductivity, density ≥98 % theoretical. Ag75W25 PSR 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). Ag75W25 PSR has a density of 11.75 g/cm³ (0.424 lb/in³), heavier than 99% of composite grades.
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 PSR properties
Typical room-temperature values for Ag75W25 PSR; 14 are specific to this condition. Other listed values are Ag75W25 reference data and may not represent this condition. Bars are the position among composite grades.
Physical1
Ag75W25 PSR has a density of 11.75 g/cm³ (0.424 lb/in³), heavier than 99% of composite grades.
Mechanical11
Ag75W25 PSR 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 PSR 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 PSR 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 PSR 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 PSR's machinability is fair (35/100, better than 50% of composite grades).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ag75W25 PSR
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.
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.
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) | — |
Ag75W25 PSR — frequently asked
What is Ag75W25 PSR used for?
Ag75W25 PSR 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 PSR?
Ag75W25 PSR 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 PSR 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 PSR 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 PSR?
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 PSR 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 PSR?
Ag75W25 PSR 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.