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Metals, alloys and elements

Iridium

Also known as Iridium metallicum, Iridium, elemental, IR

CAS 7439-88-5Formula IrMolar mass 192.22 g/molEC 231-095-9
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant 72 suppliers listed Drug substance
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
Appearance
Silver-white, face-centered cubic lattice
Melting point
2,446 °C
Boiling point
4,428 °C
Density
22.42 at 17 °C
HS code
711041
Category
Metals, alloys and elements
Illustrative photo, metallic grey powder in a steel drum in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Iridium?

Plain description, key identifiers and synonyms

Iridium atom is a cobalt group element atom and a platinum group metal atom.

Iridium is a chemical element with symbol Ir and atomic number 77.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
iridium
CAS number
7439-88-5 CAS number cross-checked
EC number
231-095-9
Molecular formula
Ir
UNII
44448S9773
MDL number
MFCD00011062
InChIKey
GKOZUEZYRPOHIO-UHFFFAOYSA-N
InChI
InChI=1S/Ir
SMILES (canonical and isomeric)
[Ir]

Synonyms

  • Iridium metallicum
  • Iridium, elemental
  • IR
  • Weakness
  • iridium atom
  • Iridium black
  • Iridium wire
  • Iridium, sponge
  • Iridium powder, -325 mesh
  • Iridium, ion(Ir4 )
  • Iridium Standard: Ir @ 10 microg/mL in 2% HCl
  • Iridium Standard: Ir @ 1000 microg/mL in 20% HCl
  • Iridium Standard: Ir @ 10000 microg/mL in 20% HCl
  • Iridium Internal Standard: Ir @ 10 microg/mL in 2% HCl
  • hydrido-iridium
  • Iridium element
  • Iridium powder
  • Iridium sponge
  • Atomic Iridium
  • Element Iridium
  • Element:Iridium
  • Iridium foil
  • Element-Ir
  • Element:Ir
  • iridium dihydride
Show all 38 synonyms
  • Iridium C
  • Iridium (atomic)
  • Ir (element)
  • Iridium (element)
  • iridium pentahydride
  • iridium(4+)
  • iridium(iv) hydride
  • Iridium (IV) ion
  • iridium ion (4+)
  • Ir/C
  • Iridium, 5% on carbon
  • Iridium (~ 20 mesh)
  • Iridium powder, -60 mesh

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Silver-white, face-centered cubic latticeexp.
Melting point
2,446 °Cexp.
Boiling point
4,428 °Cexp.
Density
22.42 at 17 °Cexp.
Vapour pressure
0.467 Pa at melting pointexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
192.22 g/molcalc.
Exact mass
192.9629 Dacalc.
LogP (octanol/water)
0calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H228Flammable solid.
  • H319Causes serious eye irritation.
  • H413May cause long lasting harmful effects to aquatic life.
Precautionary statements (10)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P337 + P317If eye irritation persists: Get medical help.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Iridium suppliers

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All 72 suppliers
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Where suppliers are based

72 suppliers in 14 countries

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Iridium price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Alloy with platinum for ammonia fuel-cell catalyst, electric contacts and thermocouples, commercial electrodes and resistance wires, laboratory ware, extrusion dies for glass fibers, jewelry. Primary standards of weight and length. /The meter was intended to equal 10-7 or one ten-millionth of the length of the meridian through Paris from pole to the equator. However, the first prototype was short by 0.2 millimeters because researchers miscalculated the flattening of the earth due to its rotation. Still this length became the standard (the platinum-iridium alloy called the "1874 Alloy.") In 1889, a new international prototype was made of an alloy of platinum with 10 percent iridium, to within 0.0001, that was to be measured at the melting point of ice.

Read more

In 1927, the meter was more precisely defined as the distance, at 0 deg, between the axes of the two central lines marked on the bar of platinum-iridium kept at the BIPM, and declared Prototype of the meter by the 1st CGPM, this bar being subject to standard atmospheric pressure and supported on two cylinders of at least one centimeter diameter, symmetrically placed in the same horizontal plane at a distance of 571 mm from each other. The 1889 definition of the meter, based upon the artifact international prototype of platinum-iridium, was replaced ... in 1960 using a definition based upon a wavelength of krypton-86 radiation. (See http://physics.nist.gov/cuu/Units/meter.html for a discussion of the platinum-iridium bar as the historical standard of length.).

Its principal use is as a hardening agent for platinum. With osmium, it forms an alloy which is used for tipping pens and compass bearings.

In manufacturing crucibles, in hardening platinum, in making nibs for fountain-pen points.

Pharmacology

Iridium is an element with atomic symbol Ir, atomic number 77, and atomic weight 192.217.

How it is made

The best method of producing iridium is to reduce ammonium hexachloroiridate(IV), (NH4)2[IrCl6], in a hydrogen atmosphere ca. 800 °C, yielding the metal powder. Calcination in air gives an oxide-containing material. Wet chemical reduction with hydrazine is possible only in strongly alkaline sodium hydroxide solution and does not always go to completion.

The powder is obtained by hydrogen reduction of ammonium chloroiridate.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Iridium is traded under.

HS 7110.41Indicative HS code

Iridium, osmium, ruthenium, unwrought or in powder form

Our trade statistics cover HS chapters 25 to 40 (minerals, chemicals, plastics and rubber). This code is in chapter 71, natural, cultured pearls, which is not included yet.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Iridium is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Iridium, based on the data on this page

What is Iridium?

Iridium atom is a cobalt group element atom and a platinum group metal atom.

What is the CAS number of Iridium?

The CAS registry number of Iridium is 7439-88-5.

What is the molecular formula and weight of Iridium?

The molecular formula of Iridium is Ir and its molar mass is 192.22 g/mol.

What is Iridium used for?

Alloy with platinum for ammonia fuel-cell catalyst, electric contacts and thermocouples, commercial electrodes and resistance wires, laboratory ware, extrusion dies for glass fibers, jewelry. Primary standards of weight and length.

Is Iridium hazardous?

Iridium carries the GHS signal word "Danger". Main hazards: flammable solid, causes serious eye irritation, may cause long lasting harmful effects to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Iridium?

Iridium is usually classified under HS code 711041 (Unwrought or in powder form). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Iridium?

CompoundList lists 72 suppliers of Iridium in United States, China, Germany, India and 10 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Iridium in India?

6 suppliers in India list Iridium on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Iridium?

Suppliers quote Iridium on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Iridium

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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