Precious Metal 833 Silver-PH (Pre-hardened)
Heat-treated state
Precipitation hardening of the Cu-rich phase — use to harden finished cast or formed pieces without cold work.
Values for the PH condition
Other 833 Silver tempers and conditions
833 Silver is listed in 7 conditions; see the grade overview at 833 Silver.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Standard stocked sheet/wire condition for raising, spinning, deep drawing and chasing. | 100 | 300 | 40 | 58 HB | 83 % IACS |
As fabricated | Condition of cast hollowware, handles and jewellery bodies straight from the mould before working or ageing. | 115 | 280 | 15 | 64 HB | 82 % IACS |
Quarter hard | Light temper for parts that must hold shape but still take mild bending. | 250 | 360 | 20 | 85 HB | 82.5 % IACS |
Half hard | General-purpose temper for flatware blanks, bezels and rims needing rigidity. | 330 | 420 | 12 | 104 HB | 82 % IACS |
PHThis page Pre-hardened | Precipitation hardening of the Cu-rich phase — use to harden finished cast or formed pieces without cold work. | 420 | 520 | 8 | 147 HB | 80 % IACS |
Full hard | Choose for knife handles, stiff wire and wear-exposed edges where no further forming is needed. | 430 | 500 | 5 | 128 HB | — |
Spring hard | For spring clips, pin stems and catch parts requiring maximum elastic limit. | 500 | 560 | 3 | 142 HB | 81 % IACS |
What is 833 Silver-PH?
833 Silver-PH is 833 Silver heat treated to PH — precipitation hardening of the Cu-rich phase — use to harden finished cast or formed pieces without cold work. 833 Silver-PH has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 96% of precious metal grades. Elongation at break is 8% and the elastic modulus is 82 GPa (11.9 Msi). 833 Silver-PH has a density of 10.2 g/cm³ (0.368 lb/in³), lighter than 57% of precious metal grades. It melts at 779°C (1,434 °F). O is the default condition FabDigit quotes; PH is available on request or by drawing note.
Advantages
- Easy to machine — 65/100, better than 100% of precious metal grades
- High strength — 420 MPa (60.9 ksi), better than 96% of precious metal grades
- Polishes to a fine finish — 95/100, better than 86% of precious metal grades
- Conducts heat well — 330 W/m·K (190.7 BTU/hr·ft·°F), better than 84% of precious metal grades
- High electrical conductivity — 80 % IACS, better than 83% of precious metal grades
Limitations
- Limited service temperature — 180°C (356 °F), worse than 100% of precious metal grades
- Limited formability — 30/100, worse than 94% of precious metal grades
- Limited ductility — 8%, worse than 92% of precious metal grades
- Needs corrosion protection — 62/100, worse than 83% of precious metal grades
833 Silver-PH properties
Typical room-temperature values for 833 Silver-PH; 21 are specific to this condition. Other listed values are 833 Silver reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
833 Silver-PH has a density of 10.2 g/cm³ (0.368 lb/in³), lighter than 57% of precious metal grades. It melts at 779°C (1,434 °F).
Mechanical12
833 Silver-PH has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 96% of precious metal grades. Elongation at break is 8% and the elastic modulus is 82 GPa (11.9 Msi).
Thermal6
833 Silver-PH is rated for continuous service to 180°C (356 °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 18.7 µm/m·K (10.4 µin/in·°F).
Electrical3
833 Silver-PH conducts electricity at 80 % IACS, better than 83% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 83% of precious metal grades.
Sustainability4
Producing a kilogram of 833 Silver-PH takes about 1,250 MJ of energy and emits 85 kg of CO₂ — less than 64% of precious metal grades. Typical recycled content is 60%.
Manufacturability8
833 Silver-PH's machinability is good (65/100, better than 100% of precious metal grades); weldability fair (45/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 833 Silver-PH
Is 833 Silver easy to machine?
Machines gummy — use sharp, polished high-rake carbide or HSS, high speed, light feed and generous lubricant; collect all swarf for refining.
Can 833 Silver be welded?
Best joined by hard soldering with Ag brazing alloys or by laser/pulse-arc welding; torch welding risks copper oxidation, porosity and firescale.
Can 833 Silver be formed, bent or molded?
Excellent cold formability in the annealed temper (raising, spinning, deep drawing, stamping); interanneal at 600–650 °C with rapid quench every 40–50 % reduction.
What surface finishes work on 833 Silver?
Polishes to a high mirror; remove firescale by pickling or depletion silvering, then optionally rhodium-plate or lacquer for tarnish resistance, or patinate with liver of sulphur.
833 Silver 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 |
|---|---|---|
| Aghallmark fineness 833/1000, no negative tolerance under Dutch Waarborgwet | 83.3 – 84.5 | 83.3 |
| Znoptional deoxidiser in some casting stocks | 0 – 1 | 0 |
| Sioccasional grain/oxidation control addition | 0 – 0.05 | 0 |
| Other (Pb, Cd, Ni)impurities; Cd and Ni restricted for skin contact (EU REACH) | 0 – 0.1 | 0 |
| Cuprincipal hardener | ≥ 15 (balance) | — |
833 Silver-PH — frequently asked
What is 833 Silver-PH used for?
833 Silver-PH is typically used for antique Dutch silverware restoration, decorative items and giftware, hallmarked reproduction flatware, hollowware and boxes, jewelry components and ecclesiastical and ceremonial pieces. In short: dutch second fineness standard; very high cold formability; restoration-grade silver alloy.
What is the yield strength of 833 Silver-PH?
833 Silver-PH has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 96% of precious metal grades. Strength varies by condition: see the 7 listed tempers.
Is 833 Silver-PH easy to machine?
Reasonably — machinability is rated good (65/100, better than 100% of precious metal grades). Machines gummy — use sharp, polished high-rake carbide or HSS, high speed, light feed and generous lubricant; collect all swarf for refining.
Can 833 Silver-PH be welded?
With care — weldability is rated fair (45/100). Best joined by hard soldering with Ag brazing alloys or by laser/pulse-arc welding; torch welding risks copper oxidation, porosity and firescale.
What surface finishes work on 833 Silver-PH?
Polishes to a high mirror; remove firescale by pickling or depletion silvering, then optionally rhodium-plate or lacquer for tarnish resistance, or patinate with liver of sulphur.
Can 833 Silver-PH be formed, bent or molded?
Excellent cold formability in the annealed temper (raising, spinning, deep drawing, stamping); interanneal at 600–650 °C with rapid quench every 40–50 % reduction.
What is the maximum service temperature of 833 Silver-PH?
833 Silver-PH is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 833 Silver-O and 833 Silver-H08?
O is the default condition — standard stocked sheet/wire condition for raising, spinning, deep drawing and chasing. H08: for spring clips, pin stems and catch parts requiring maximum elastic limit. Yield strength is 100 MPa in O versus 500 MPa in H08.
Sources
- Waarborgwet 1986 — Dutch hallmarking standards for silver (835/833/925) — Waarborg Holland (1986)
- ISO 9202 Jewellery — Fineness of precious metal alloys — ISO (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Silver and Silver Alloys) — ASM International (1990)
- ASM Binary Alloy Phase Diagrams — Ag–Cu system — ASM International (1990)
- The Theory and Practice of Goldsmithing / jewellery alloy metallurgy references — Brynmorgen Press (2004)
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.