Material Database

Iridium / Ir

  • General Designation: Iridium
  • Applications: crucibles, thermocouples, spark plug electrodes, probe needles
  • Product Forms: wire
  • Density (g/cm³): 22.56

Details

Material Behaviour
not ductile
Forming Process
hardly formable, limited machinability, hot formable

Observations¹
In contact with
Temperature (°C)
Medium
Condition
Corrosion
20 solid dry no measurable corrosion
20 solid moist no measurable corrosion
20 hydrogen sulphide H2S moist no measurable corrosion
20 hydrofluoric acid HF 40% no measurable corrosion
20 gaseous Cl2 moist no measurable corrosion
20 nitric acid HNO3 65% no measurable corrosion
20 sulphuric acid H2SO4 96% no measurable corrosion
20 aqua regia HNO3+HCl - no measurable corrosion
20 ethanol/iodine - no measurable corrosion
20 bromine water - no measurable corrosion
20 hydrochloric acid/chlorine 36% no measurable corrosion
20 dry Br2 moist no measurable corrosion
hydrobromic acid/bromine HBr/Br2 60% no measurable corrosion
20 hydrofluoric acid HF 40% no measurable corrosion
hydro-iodic acid HI 57% no measurable corrosion
20 dry Br2 dry no measurable corrosion
20 gaseous Cl2 dry no measurable corrosion
100 hydrochloric acid/chlorine 20%/ saturated light corrosive attack
100 sodium hypochlorite NaClO - light corrosive attack
100 mercury chloride HgCl2 - no measurable corrosion
100 aluminium sulphate Al2(SO4)3 - no measurable corrosion
100 orthophosphoric acid - no measurable corrosion
100 copper sulphate - no measurable corrosion
100 hydrobromic acid HBr 60% no measurable corrosion
98 nitric acid HNO3 65% no measurable corrosion
100 hydrochloric acid/chlorine 36% no measurable corrosion
100 sulphuric acid H2SO4 96% no measurable corrosion
100 aqua regia HNO3+HCl - no measurable corrosion
100 acetic acid 99%
100 phosphoric acid - no measurable corrosion
100 hydro-iodic acid HI 57% no measurable corrosion
150 aqua regia HNO3+HCl - relatively severe attack
440 potassium bisulphate KHSO4 air access no measurable corrosion
550 molten NaCN/KCN (2:1) air access relatively severe attack
700 not known air access relatively severe attack
700 molten NaCN air access relatively severe attack
Comment
oxidation resistant to 800°C
Sources Chemical
¹ Edelmetall-Taschenbuch, ISBN 3-7785-2448-8

IACS Min. (%) [100% IACS ≙ 58 S*m/mm²]
24
IACS Max. (%) [100% IACS ≙ 58 S*m/mm²]
26
Thermo-emf. vs. copper Hard (mV)
-0.1
Temperature coefficient of electric resistivity
From Temperature (°C)
To Temperature (°C)
Hard (x10-4/K)
Annealed (x10-4/K)
0 100 43

Young's Modulus (GPa)
528
Young's Modulus - HT¹
Modulus of Rigidity (GPa)
210
Poission's ratio
0.39
Annealed
Hardness (HV)
Tensile strength (MPa)
Yield strength (MPa)
Elongation (%)
210 450 93 7
Work hardened
Hardness (HV)
Tensile Strength (MPa)
Yield Strength (MPa)
Elongation (%)
453 1632 1618 1
Property Range
Hardness (HV)
Tensile Strength (MPa)
Yield Strength (MPa)
Elongation (%)
210 - 453 450 - 1632 93 - 1618 1 - 7

Melting Range
From Temperature (°C)
To Temperature (°C)
2447
Thermal conductivity (W /(m*K)) [RT]
59
Linear Coefficient of Expansion³
From Temperature (°C)
To Temperature (°C)
Coefficient (x10-6/K)
20 100 6.7
20 300 7.1
20 900 7.8
20 1000 7.9
20 1100 8
20 1200 8.1
20 1300 8.2
20 1400 8.4
20 1500 8.5
20 1600 9.2

Disclaimer

The information in this data sheet contains only general information on the use of our products or examples for their application. They do not release the customer from a careful inspection of the delivered product for its fitness for the customer's particular purpose of use. Any customer's special requests regarding the particular use of a product will only be authoritative if Heraeus has confirmed to the customer in writing at the time of conclusion of a corresponding contract that the product delivered is fit for the customer's intended use. Heraeus, therefore, does not guarantee the correctness and completeness of the information regarding the customer's intended use. The customer's purchase will be governed exclusively by the written order confirmation of Heraeus and the Heraeus General Terms of Sale and Delivery, which are available at www.heraeus.com/gtc. This data sheet may be subject to changes at any time.

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