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Silver compounds

Silver powder , CAS 7440-22-4

AgMW 107.87 g/mol100% AgMade in Dublin, Ireland

Synonyms: Silver metal powder; Silver, powder; Metallic silver; Argentum; Ag powder; Ag

Also known as: Silberpulver (German); Plata en polvo (Spanish); Poudre d'argent (French); Argento in polvere (Italian); Zilverpoeder (Dutch)

GHS08
Health hazard
GHS09
Environment

Overview

Fine silver metal for the uses that need silver itself rather than a silver salt: conductive inks and pastes, sintered joints, catalysts and electrodes.

Fine silver metal powder, ≥99.9% Ag, for conductive inks, pastes and adhesives, silver catalysts (including the preparation of ethylene oxide and formaldehyde catalysts), brazing and sintering pastes, silver-oxide and silver-zinc battery electrodes, and antimicrobial composites. Particle-size distribution and apparent density are reported on the certificate of analysis for each lot. Classified and labelled according to the EU harmonised entry for silver powder in Annex VI of the CLP Regulation.

Application areas

Typical applications of silver powder

Silver powder is the functional filler in conductive inks, pastes and adhesives: the screen-printed front-side metallisation of silicon solar cells, thick-film conductors on ceramic substrates, membrane switches, RFID antennas and electromagnetic shielding. Sintered-silver die attach, in which a paste of fine silver is densified at 200–300 °C with or without pressure, has become the standard high-temperature joint for power electronics because the sintered layer melts only at the melting point of silver.

In catalysis, silver powder and silver crystals are the active phase for the industrial oxidation of methanol to formaldehyde and the starting material for silver catalysts for ethylene oxide, and in the laboratory fine silver is used for reductive dehalogenation, for Wolff rearrangements and as the active metal in silver-catalysed oxidations. It is also the anode material of silver–zinc and silver-oxide cells and the conductive additive in a range of battery and supercapacitor electrodes.

Other uses include brazing and silver solder pastes, silver-filled polymers for antimicrobial and antistatic applications, electrical contact materials made by powder metallurgy (silver–cadmium oxide, silver–tin oxide and silver–graphite), and the manufacture of silver salts and silver nitrate by dissolution in nitric acid.

Specification

Product nameSilver powder
SynonymsSilver metal powder; Silver, powder; Metallic silver; Argentum; Ag powder; Ag
Molecular formulaAg
CAS number7440-22-4
Molecular weight107.87 g/mol
MetalSilver (Ag)
Metal content100% Ag by mass (nominal; lot assay on the CoA)
Purity / grade≥99.9% Ag (metals basis)
AppearanceFine grey metallic powder
SolubilityInsoluble in water, alkalis and non-oxidising acids. Dissolves in nitric acid and in hot concentrated sulfuric acid; dissolves slowly in alkali cyanide solutions in the presence of oxygen.
Melting point961.8 °C; boils at 2162 °C.
Density10.49 g/cm³ (bulk metal); the apparent and tap density of the powder are reported per lot.
Particle sizeParticle-size distribution is reported on the certificate of analysis for each lot. Ask us if you need a specific range.
Electrical conductivityThe highest of any metal: about 6.3 × 10⁷ S/m for the bulk metal at 20 °C.
TarnishDarkens slowly in air containing hydrogen sulfide or sulfur vapours as silver sulfide forms on the surface.
StorageStore tightly closed in a dry place. Protect from moisture and sulfur-containing vapours to prevent tarnishing.
Pack sizes100 g, 500 g, 1 kg
Country of originIreland (manufactured in Dublin)

Solubility, melting point and density are literature values for the pure compound and are given for guidance; purity, silver assay and appearance are measured on each lot and reported on its certificate of analysis.

Handling and storage

  • Classified under the EU harmonised entry for silver powder: suspected of damaging fertility (H361f), may cause damage to organs through prolonged or repeated exposure (H373) and very toxic to aquatic life (H410). Avoid breathing dust; use local exhaust when handling open powder and wear gloves and goggles.
  • Fine metal powders can form combustible dust clouds; avoid dispersing the powder in air near ignition sources and keep it away from acetylene (silver acetylide) and from ammonia or ammonium salts (silver nitride).
  • Store tightly closed in a dry place away from sulfur-containing vapours (rubber, vulcanised materials, hydrogen sulfide) to prevent tarnishing. A tarnished surface raises contact resistance in electronic applications.
  • Silver powder is electrically conductive; keep it away from live electronics and clean up spills completely.
  • Not regulated as dangerous goods in our pack sizes (UN3077 small-quantity exemption, ADR SP 375 / IATA A197): ships by standard courier.

Hazard classification (CLP / GHS)

GHS08
Health hazard
GHS09
Environment
Signal wordWarning
Hazard statements
  • H361f Suspected of damaging fertility.
  • H373 May cause damage to organs through prolonged or repeated exposure.
  • H410 Very toxic to aquatic life with long lasting effects.
Precautionary statements
  • P201 Obtain special instructions before use.
  • P202 Do not handle until all safety precautions have been read and understood.
  • P280 Wear protective gloves, protective clothing, eye protection and face protection.
  • P308+P313 IF exposed or concerned: Get medical advice/attention.
  • P405 Store locked up.
  • P501 Dispose of contents/container to an approved waste disposal plant.
  • P260 Do not breathe dust.
  • P314 Get medical advice/attention if you feel unwell.
  • P273 Avoid release to the environment.
  • P391 Collect spillage.
TransportUN3077, Class 9, PG III. Our pack sizes fall within the small-quantity exemption (ADR SP 375 / IATA A197) and ship by standard courier without a dangerous-goods surcharge.

Classification per Regulation (EC) No 1272/2008 (CLP). The safety data sheet issued with each lot is the authoritative source; where this page and the SDS differ, follow the SDS. For research and industrial use only. Not for human, veterinary, food or cosmetic use.

Documents

Safety data sheet (SDS)

The current SDS for Silver powder is supplied with every quotation and shipment. Request a copy.

Certificate of analysis (CoA)

Issued per lot with silver assay. Enter the lot number from your label.

Find a CoA

Frequently asked questions

What is the particle size of this silver powder?

The particle-size distribution and the apparent density are measured and reported on the certificate of analysis for every lot, because they govern how the powder behaves in a paste or a sinter. If your application needs a specific size range or morphology (for example flake for screen-printing pastes or sub-micron spheres for sintering), contact us before ordering and we will confirm what the current lot offers.

Why does silver powder carry reproductive and organ-toxicity hazard statements?

Silver, in powder and massive form, has an EU harmonised classification in Annex VI of the CLP Regulation that includes Repr. 2 (H361f), STOT RE 2 (H373) and Aquatic Acute/Chronic 1 (H410). The classification reflects the toxicology of silver ions released from the metal and applies to all suppliers' silver powder. Normal good practice for metal powders, i.e. avoiding dust and wearing gloves, controls the risk; see the SDS supplied with each lot.

Is silver powder flammable or pyrophoric?

Silver powder in the particle sizes we supply is not classified as a flammable solid and is not pyrophoric. Like all finely divided metals it can form a combustible dust cloud if dispersed in air, so avoid creating dust near ignition sources and do not use compressed air to clean up spills. Nano-sized silver (not this product) can be considerably more reactive.

Can I use it to make conductive paste or sintered joints?

Yes, provided the particle size suits your process. Screen-printing pastes typically combine silver flake and spherical powder with a glass frit or polymer binder and solvent; sintered die-attach pastes use fine spherical or flake silver with an organic vehicle that burns out at 200–300 °C. The ≥99.9% silver grade with controlled trace metals gives the low resistivity these applications need; check the lot's particle-size report against your formulation.

How is silver powder shipped?

It is assigned UN3077 (environmentally hazardous substance, solid) but our pack sizes fall within the ADR SP 375 / IATA A197 small-quantity exemption, so it ships by standard courier with no dangerous-goods surcharge.

Ordering, shipping and documentation
What is the CAS number of silver powder?

Silver powder has CAS Registry Number 7440-22-4. Its formula is Ag (107.87 g/mol) and it contains about 100% silver by mass.

How is silver powder priced?

Pack prices are linked to the live silver spot price: silver content × spot €/g, plus a fixed fee per pack for manufacture, packaging and the certificate of analysis. The price shown is indicative and confirmed on your quotation; it excludes VAT and shipping.

Is silver powder classed as dangerous goods for shipping?

No surcharge applies. Silver powder is UN3077 (class 9) but our pack sizes fall within the small-quantity exemption (ADR SP 375 / IATA A197), so it ships by standard courier.

Do you supply a certificate of analysis and SDS for silver powder?

Yes. Every lot ships with a lot-specific certificate of analysis including silver assay, and the current safety data sheet is available on this page and on request. Lot certificates can also be retrieved by lot number from our CoA lookup.

Where do you ship silver powder?

We ship from Dublin to Ireland (from €12.00) and to all EU member states (from €25.00), plus Northern Ireland. For research and industrial use only; business customers only.

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