VERIFIED(Source-Verified)

Silver 970

Primary Designation:ISO Ag970

Aliases:

970 SilverEnamelling SilverAg970

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 13 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

10.43 g/cm³TYPICAL · at 20 °C

Electrical Conductivity

96 % IACSTYPICAL · at 20 °C

Thermal Conductivity

424 W/(m·K)TYPICAL · at 20 °C

Melting Point

undefined °C

Composition Excerpt

Ag ≥ 97 wt%Silver (min)

Standard Elemental Basis: MIN

Tensile Strength

≥ 165 MPaTYPICAL · Annealed (Soft) · temperature not stated

Engineering Summary

Silver 970 (970 parts per thousand / 97.0% Ag minimum, balance copper) is a high-purity silver-copper alloy frequently specified for vitreous enamelling and high-precision electromechanical switch contacts. Its low copper content (3.0%) suppresses copper oxide staining under transparent enamel glazes while providing approximately 36% greater yield strength than fine silver.

Silver 970 Documented Applications

›Vitreous enamel substrates and cloisonné metal backing
›Precision low-force electromechanical instrument switches
›High-purity laboratory ware and specialized chemical crucibles
›Malleable decorative and liturgical metalwork

Recognized Aliases

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

970 SilverEnamelling SilverAg970

Silver 970 Specifications & Designations

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

Direct Standard DesignationsDIRECT DESIGNATION

3 Primary Identifiers

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System	Identifier	Standard System Name	Classification Notes & Provenance
ISOPRIMARY	Ag970	International Organization for Standardization	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
DIN	Ag970	Deutsches Institut für Normung	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)
EN	AgCu3	European Norm	—Ref: Standard Specifications for Silver & Silver Alloys (ASTM B742, ASTM B413, ISO 9202, DIN 17510)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

3 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
970 Silver	Colloquial Alias	Colloquial or commercial industry synonym
Enamelling Silver	Commercial Alias	Colloquial or commercial industry synonym
Ag970	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

3 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
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
ISO	ISO 9202 Fineness of Precious Metal Alloys	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.

Silver 970 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	≥ 97.00	wt%	Ref: ASTM International & ISO / DIN Standards Technical Committees	VERIFIED
Copper	Cu	29	RANGE	2.80 – 3.00	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:

Silver 970 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	10.43 g/cm³	TYPICAL	Test Temp: 20 °C	10.43 g/cm³	ASTM International & Standards Technical Committees	VERIFIED

Silver 970 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	424 W/(m·K)	TYPICAL	Test Temp: 20 °C	424 W/(m·K)	ASTM International & Standards Technical Committees	VERIFIED
Melting Range (Solidus-Liquidus)	910 – 950 °C	RANGE	Solidus 910°C, Liquidus 950°C	910 – 950 °C	ASTM International & Standards Technical Committees	VERIFIED

Silver 970 Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

1 Parameters

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Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical Conductivity	96 % IACS	TYPICAL	Test Temp: 20 °C	96 % IACS	ASTM International & Standards Technical Committees	VERIFIED

Silver 970 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

77 GPa

Product Form:

Temper / Condition:

Showing 4 of 4 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 & Wire	Annealed (Soft) Source values and qualifiers Yield Strength (0.2% Offset): ≥ 65 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Ultimate Tensile Strength: ≥ 165 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Elongation at Break: ≥ 38 % (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	≥ 165 MPa	≥ 65 MPa	≥ 38 %	—	—	—	VERIFIED
Strip & Wire	Hard Drawn (50% reduction) Source values and qualifiers Yield Strength (0.2% Offset): ≥ 280 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Ultimate Tensile Strength: ≥ 330 MPa (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510 Elongation at Break: ≥ 3 % (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	≥ 330 MPa	≥ 280 MPa	≥ 3 %	—	—	—	VERIFIED
Standard Product Form	Annealed (Soft) Source values and qualifiers HV Hardness: 40–52 HV (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	—	—	—	—	—	40–52 HV	VERIFIED
Standard Product Form	Hard Drawn (50% reduction) Source values and qualifiers HV Hardness: 95–115 HV (TYPICAL)ASTM International & ISO / DIN Standards Technical Committees — ASTM B742, ASTM B413, ISO 9202, DIN 17510	—	—	—	—	—	—	95–115 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

Silver 970 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 32% relative to C36000. Moderate gumminess; slightly more rigid than fine silver, improving edge definition during turning.

Weldability & Joining

Readily joined by torch or furnace silver brazing; TIG welding permissible under argon shield.

Heat Treatment & Working Ranges

Annealed at 350°C to 450°C for 20 minutes, followed by water quench. Minor solid-solution strengthening from 3% Cu solute.

Forming & Cold Working

High cold malleability; easily rolled, swaged, or formed into intricate profiles without cracking.

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 Silver 970 states: Rated at approximately 32% relative to C36000. Moderate gumminess; slightly more rigid than fine silver, improving edge definition during turning. A relevant hardness example is HV Hardness: 40–52 HV (typical; Annealed (Soft)). 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 joined by torch or furnace silver brazing; TIG welding permissible under argon shield. The first cataloged strength example is Yield Strength (0.2% Offset): minimum 65 MPa (typical; Annealed (Soft), Strip & 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: 424 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 97 wt%, Cu 2.8–3 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use ISO Ag970, DIN Ag970, EN AgCu3 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Vitreous enamel substrates and cloisonné metal backing 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

Silver 970 Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for Silver 970. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status	Action
Fine Silver 999	Silver & Silver Alloys	Commonly Compared	Silver 970 provides 36% higher yield strength (75 MPa vs 55 MPa) with minimal drop in electrical conductivity (96% vs 106% IACS).Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED
Sterling Silver 925	Silver & Silver Alloys	Commonly Compared	Silver 970 possesses lower copper content (3.0% vs 7.5%), offering superior firescale resistance and enamel compatibility compared to sterling silver.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 Silver 970.

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.