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.

SubstanceTungsten
(W/WX)
Nickel
(Ni)
Gold- sheathed
Tungsten (AuW)
Air/Oxygen Good GoodVery Good
Water GoodGoodGood
Steam Good (below 700oC)GoodGood
Ammonia/Amines Good Poor in presence   of H2O Poor
CO / CO2GoodGoodGood
HydrogenGoodGoodGood
NitrogenGoodGoodFair
FluorinePoor (Fluoride forms at 20oC)GoodPoor
ChlorineFairGoodFair
BromineFairGoodFair
IodineFairGoodFair
SulfurFairPoorGood
H2S/SO2FairPoorGood
HCFairGoodFair
HFFairGoodFair
HF/HNO3PoorGoodPoor

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