AGC Instruments manufactures all its own Hot Wire Filaments.

A choice of materials is available depending on the application in question.

The choice includes:

  • Gold-Sheathed Tungsten (AuW)
  • Tungsten (W)
  • Rhenium-tungsten (WX)
  • Nickel (Ni)
  • Nickel alloy

Each type has specific characteristics such as corrosion resistance, oxidation resistance, catalytic reactions and sensitivity for use which are dependent on the application required.

Hot Wire Filaments required for corrosive applications are best suited to be manufactured in Gold-sheathed tungsten, with special resistance to Oxygen.

The Filaments are sold as matched pairs with standard 50mm (2”) leads or at lengths more suited to the customer’s requirement.

Substance Tungsten
Gold- sheathed
Tungsten (AuW)
Air/Oxygen  Good  Good Very Good
Water  Good Good Good
Steam  Good (below 700oC) Good Good
Ammonia/Amines  Good  Poor in presence   of H2O  Poor
CO / CO2 Good Good Good
Hydrogen Good Good Good
Nitrogen Good Good Fair
Fluorine Poor (Fluoride forms at 20oC) Good Poor
Chlorine Fair Good Fair
Bromine Fair Good Fair
Iodine Fair Good Fair
Sulfur Fair Poor Good
H2S/SO2 Fair Poor Good
HC Fair Good Fair
HF Fair Good Fair
HF/HNO3 Poor Good Poor

For more information on our Hot Wire Filaments please contact us directly.