VERIFIED(Source-Verified)

Sterling Silver 925

Primary Designation:UNS P07925

Aliases:

Sterling Silver925 SilverStandard SilverUNS P07925

Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →

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Data Completeness:2 composition elements and 19 condition-specific property values cataloged.

Omitted fields represent unverified properties. "Missing is better than invented."

Key Engineering Properties

Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.

Density

10.36 g/cm³TYPICAL · at 20 °C

Electrical Conductivity

84 % IACSTYPICAL · at 20 °C

Thermal Conductivity

410 W/(m·K)TYPICAL · at 20 °C

Melting Point

undefined °C

Composition Excerpt

Ag ≥ 92.5 wt%Silver (min)

Standard Elemental Basis: MIN

Tensile Strength

≥ 220 MPaTYPICAL · Annealed (O Temper) · temperature not stated

Engineering Summary

Sterling Silver 925 is the preeminent global silver engineering alloy, containing a minimum of 92.50% silver alloyed with 7.50% copper. The copper addition creates an alpha + beta two-phase microstructure that more than doubles the yield strength and hardness of pure silver while preserving exceptional electrical conductivity (84% IACS) and thermal conductivity (410 W/(m·K)). Uniquely among common precious metal alloys, Sterling Silver is heat-treatable and precipitation hardenable.

Sterling Silver 925 Documented Applications

›Precision sliding electrical switchgear and relay contacts
›Acoustic instrument bodies (professional flutes, brass instrument bell liners)
›High-reliability multi-pin electronic connector shells and spring pins
›Precision surgical instruments requiring antimicrobial properties and rigidity
›Heavy-duty flatware, holloware, and high-wear decorative engineering assemblies

Recognized Aliases

Source-backed commercial trade name and short designations cataloged in canonical data.

Sterling Silver925 SilverStandard SilverUNS P07925

Sterling Silver 925 Specifications & Designations

Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.

Direct Standard DesignationsDIRECT DESIGNATION

6 Primary Identifiers

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System	Identifier	Standard System Name	Classification Notes & Provenance
UNSPRIMARY	P07925	Unified Numbering System	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
ISO	Ag925	International Organization for Standardization	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
ASTM	B742 Grade 92.5	ASTM International	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
DIN	Ag925	Deutsches Institut für Normung	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
W-Nr	2.1213	Werkstoffnummer	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
UK-HALLMARK	925	UK Hallmarking Act Fineness Mark	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

4 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
Sterling Silver	Commercial Alias	Colloquial or commercial industry synonym
925 Silver	Colloquial Alias	Colloquial or commercial industry synonym
Standard Silver	Historical Alias	Colloquial or commercial industry synonym
UNS P07925	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

5 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM B742 / B742M	Standard Specification for Fine Silver Electrical Contact Material (Grade 92.5)	Specification Reference
ISO	ISO 9202	Jewellery and precious metals — Fineness of precious metal alloys	Specification Reference
DIN	DIN 17510	Feinsilber und Silberlegierungen (Fine silver and silver alloys)	Specification Reference
UK-STATUTE	British Hallmarking Act 1973	Hallmarking Act 1973 (Schedule 2 Standards of Fineness - Sterling Silver)	Specification Reference
ASTM	ASTM B742 Standard Specification for Fine Silver Contact Material (Grade 92.5)	Applicable specification reference.	Specification Reference

Engineering Notice: Applicable specifications establish manufacturing requirements, dimensional tolerances, and test criteria for specific product forms (e.g. bus bar, wire, plate, pipe). They represent applicable technical standards, not alternative or equivalent alloy grades.

Sterling Silver 925 Chemical Composition

Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).

Scroll horizontally for full elemental limits

Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Silver	Ag	47	MINIMUM	≥ 92.50	wt%	Ref: ASTM International & ISO / DIN Standards Technical Committees	VERIFIED
Copper	Cu	29	RANGE	7.20 – 7.50	wt%	Ref: ASTM International & ISO / DIN Standards Technical Committees	VERIFIED

* Elemental percentages are expressed in weight percent (wt%). Values represent applicable specification limits. Unspecified trace elements are not fabricated or assumed.Preserves exact semantic basis

Property Display UnitsSwitch between Canonical SI and Source / US Customary units:

Sterling Silver 925 Physical Properties

Source-specific physical properties. Test temperatures are shown only where reported.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Density	10.36 g/cm³	TYPICAL	Test Temp: 20 °C	10.36 g/cm³	ASTM International & Standards Technical Committees	VERIFIED

Sterling Silver 925 Thermal & Thermodynamic Properties

Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.

2 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Thermal Conductivity	410 W/(m·K)	TYPICAL	Test Temp: 20 °C	410 W/(m·K)	ASTM International & Standards Technical Committees	VERIFIED
Melting Range (Solidus-Liquidus)	779 – 893 °C	RANGE	Solidus 779°C (Ag-Cu eutectic point), Liquidus 893°C	779 – 893 °C	ASTM International & Standards Technical Committees	VERIFIED

Sterling Silver 925 Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

2 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical Conductivity	84 % IACS	TYPICAL	Test Temp: 20 °C	84 % IACS	ASTM International & Standards Technical Committees	VERIFIED
Electrical Resistivity	20.5 nΩ·m	TYPICAL	Test Temp: 20 °C	20.5 nΩ·m	ASTM International & Standards Technical Committees	VERIFIED

Sterling Silver 925 Mechanical Properties

Contextual Mechanical Properties & Tempers: Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.

Elastic & Baseline Mechanical ConstantsSource-specific measurement conditions

Modulus of Elasticity

82 GPa

Poisson's Ratio

0.36 dimensionless

Product Form:

Temper / Condition:

Showing 7 of 7 conditions

Scroll horizontally for all conditions & tempers

Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Strip, Sheet, Wire	Annealed (O Temper) Source values and qualifiers Yield Strength (0.2% Offset): ≥ 125 MPa (TYPICAL)ASTM E8 / ISO 6892-1ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Ultimate Tensile Strength: ≥ 220 MPa (TYPICAL)ASTM E8 / ISO 6892-1ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	≥ 220 MPa	≥ 125 MPa	—	—	—	—	VERIFIED
Strip, Sheet, Wire	Annealed (O Temper) Source values and qualifiers Elongation at Break: ≥ 28 % (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	— · in 50 mm (2 in)	—	—	≥ 28 %	—	—	—	VERIFIED
Strip & Wire	Precipitation Aged (Heat Treated 300°C) Source values and qualifiers Yield Strength (0.2% Offset): ≥ 220 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Ultimate Tensile Strength: ≥ 320 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Elongation at Break: ≥ 14 % (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	≥ 320 MPa	≥ 220 MPa	≥ 14 %	—	—	—	VERIFIED
Strip & Wire	Hard Rolled / Hard Drawn (H Temper, 50% reduction) Source values and qualifiers Yield Strength (0.2% Offset): ≥ 350 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Ultimate Tensile Strength: ≥ 430 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Elongation at Break: ≥ 4 % (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	≥ 430 MPa	≥ 350 MPa	≥ 4 %	—	—	—	VERIFIED
Standard Product Form	Annealed (O Temper) Source values and qualifiers HV Hardness: 62–78 HV (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	—	—	—	—	—	62–78 HV	VERIFIED
Standard Product Form	Precipitation Aged (Heat Treated 300°C) Source values and qualifiers HV Hardness: 110–140 HV (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	—	—	—	—	—	110–140 HV	VERIFIED
Standard Product Form	Hard Rolled / Hard Drawn (H Temper, 50% reduction) Source values and qualifiers HV Hardness: 145–175 HV (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	—	—	—	—	—	145–175 HV	VERIFIED

Hardness Integrity Notice: Rockwell B (HRB), Rockwell F (HRF), and Superficial 30T (HR30T) scales are reported on their measured scales without cross-scale mathematical conversion.

Source: See fact-level citations

Sterling Silver 925 Processing & Fabrication

Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.

Source: ASTM International & ISO / DIN Standards Technical Committees

Machinability

Rated at approximately 45% relative to C36000. Chips shear more cleanly than fine silver; tool life is good when using positive rake carbide inserts and flood oil/emulsion coolant.

Weldability & Joining

Readily brazed using silver solder (AWS BAg-1 to BAg-7). Subject to firescale (subsurface cuprous oxide Cu2O formation) when heated in oxidizing atmospheres without flux.

Heat Treatment & Working Ranges

Precipitation hardenable: Solution heat treat at 740°C to 760°C for 15-30 minutes and rapid water quench; artificial age at 280°C to 300°C for 45-60 minutes to achieve peak hardness of 110-140 HV.

Forming & Cold Working

Excellent cold working characteristics; readily stamped, coined, and rolled with periodic annealing at 600°C.

Practical Engineering & Fabrication Notes

By Mat Grades Editorial Desk · Updated 2026-11-14. Use alongside the specified product standard and supplier certificate.

Machining & shop-floor behavior

The cataloged machining note for Sterling Silver 925 states: Rated at approximately 45% relative to C36000. Chips shear more cleanly than fine silver; tool life is good when using positive rake carbide inserts and flood oil/emulsion coolant. A relevant hardness example is HV Hardness: 62–78 HV (typical; Annealed (O Temper)). Use that supplied condition for a trial of the difficult feature. Record tool changes, burr removal, unclamped dimensions and accepted parts per hour. Relative machinability ratings from different reference scales should not be compared as if they were one common test.

Weldability, brazing & joining

The available joining assessment states: Readily brazed using silver solder (AWS BAg-1 to BAg-7). Subject to firescale (subsurface cuprous oxide Cu2O formation) when heated in oxidizing atmospheres without flux. The first cataloged strength example is Yield Strength (0.2% Offset): minimum 125 MPa (typical; Annealed (O Temper), Strip, Sheet, Wire). Assess the final part after joining or thermal processing. Include distortion, cleanup and inspection in the quotation. A material designation or favorable process rating is a starting point for qualification, not evidence that an untested joint meets the drawing.

Corrosion & service environment

Distinguish appearance, electrical contact behavior and mechanical wear in the service requirement. Tarnish resistance is not the same as freedom from surface films in every atmosphere. Check the mating material, cleaning method and final condition rather than using nominal purity as the only acceptance criterion. The recorded thermal example is Thermal Conductivity: 410 W/(m·K) (typical; ; test temperature 20 °C). State the exposure and inspection access in the design record so that a change of installation or cleaning method triggers a review. The selected composition entries are Ag minimum 92.5 wt%, Cu 7.2–7.5 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use UNS P07925, ISO Ag925, ASTM B742 Grade 92.5 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Precision sliding electrical switchgear and relay contacts as an application example. The related candidate Fine Silver 999 is linked for comparison; its commonly compared relationship must be checked before substitution. Compare the complete route through machining, joining, finish and inspection. Keep the certificate, required test location and acceptance criteria with the first-article record. A later change of grade, condition or source should be assessed against that same requirement.

Technical references: ASTM International & ISO / DIN Standards Technical Committees

Sterling Silver 925 Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for Sterling Silver 925. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status
Fine Silver 999	Silver & Silver Alloys	Commonly Compared	Sterling Silver 925 offers more than 2.4× the yield strength of Fine Silver 999 (135 MPa vs 55 MPa) and responds to precipitation heat treatment, at the cost of reduced conductivity (84% vs 106% IACS) and increased susceptibility to firescale.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED
C11000 ETP Copper	Copper Alloys	Commonly Compared	Sterling silver provides high electrical conductivity (84% IACS) with superior atmospheric tarnish resistance and higher annealed hardness than pure C11000 copper.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED
Silver 900	Silver & Silver Alloys	Commonly Compared	Adjacent standard alloy; 900 coin silver incorporates 10% Cu yielding higher wear resistance and higher hard-drawn hardness (165 HV vs 160 HV).Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED

Related Engineering & Metallurgy Guides

Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to Sterling Silver 925.

Material Selection12 min read

Density of Silver: Pure, Sterling, Temperature Effects & Calculator

Silver possesses the highest electrical and thermal conductivity of any metallic element, accompanied by a solid room-temperature density of 10.49 g/cm³ (10,490 kg/m³). Because common alloying additions—chiefly copper—possess lower densities, precision volumetric measurement provides a fundamental non-destructive methodology for alloy purity and fineness verification.

Author: Mat Grades Editorial DeskRead Guide →

Sources

Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.

ASTM International & Standards Technical CommitteesStandard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)

STANDARDS ORG

Authoritative data harmonized across ASTM B742, ASTM B413, ISO 9202, DIN 17510, British Hallmarking Act 1973, and ASM International monographs.

Issuing Body: ASTM International & ISO / DIN Standards Technical CommitteesRevision: ASTM B742-20 / ISO 9202:2019 / DIN 17510View Source Record ↗

Intellectual Property & Provenance Notice: Mat Grades cites technical literature from recognized industry associations and standards organizations. Underlying technical standards and publication data remain the intellectual property of their respective issuing organizations.