Fernox FC1 Inhibitor protects against internal corrosion and limescale formation in mixed metal, light commercial and HVAC heating and cooling systems. This product ensures system efficiency and longevity, and is compatible with all other Fernox commercial chemicals.

  • Central Heating Inhibitor for mixed metal commercial and HVAC heating and cooling systems
  • Inhibits corrosion in steel, cast iron, copper, brass and aluminium
  • Prevents limescale build-up
  • Maintains system efficiency and extends system lifespan
  • Compatible with all other Fernox commercial chemicals
  • Non-toxic, nitrite, nitrate, phosphate and boric acid free


The recommended in-use concentration of the product is 1% v / v %. Fernox FC1 Inhibitor can be introduced into the system via a suitable point (e.g. dosing pot). To ensure rapid dispersion, partly or completely drain down and introduce Fernox FC1 Inhibitor whilst refilling. We recommend untreated systems are thoroughly cleaned and flushed using Fernox FC3 Cleaner before treating with Fernox FC1 Inhibitor as existing debris can damage the installation.

Physical Properties

Colour: Light Yellow
Odour: Aromatic (slight)
Form: Clear liquid
pH (conc): 7.8
pH (1% soln): 7.3 – 8.1
SG: 1.05 at 20°C

Packaging, Handling and Storage

Fernox FC1 Inhibitor is supplied in 20 litre containers. Fernox FC1 Inhibitor is classified as non-hazardous but, as with all chemicals, keep out of reach of children. Do not mix with other chemicals outside of the Fernox product range. Do not take internally. May produce an allergic reaction. Contains: 1,2-benzisothiazol-3(2H)-one. In case of contact with eyes or skin, rinse immediately with plenty of water.

Please contact the supplier to check availability of stock