top of page

Protector F1 Express 400ml

Product Code: 62418

Protector F1 is the market leading inhibitor which prevents corrosion and limescale formation in central heating systems.

This high performance product offers superior protection by uniquely combining three inhibitors of organic particles, which bind to the metal within the heating system to protect from debris alongside anodic inhibitors which react with the system’s metal surface to create a protective layer, and cathodic inhibitors that combine with hard water salts to form an insoluble layer. Fernox Protector F1 also includes enhanced a pH buffering to ensure the system water pH level does not drop below 6.5 or above 8.5 – the optimum pH range for preventing corrosion and limescale build-up. In line with local regulations and best practice, and for long-term protection of the system, concentration levels should be maintained and checked annually as part of the boiler or system service.

The Fernox Express range uses Barrier Pressure Pack technology and compressed air propellent to expel the product so the entire range is non-flammable. The propellent (compressed air) is not mixed with the active product so there is no risk of air ingress into the system which could accelerate future risk of corrosion.

  • Protects against corrosion and scale in mixed metal central heating systems to prevent breakdown and premature boiler failure
  • Quick and convenient – doses in 30 seconds via radiator, filling loop or Fernox TF1 System Filter – no need to drain down the system
  • Treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.
  • Supports boiler manufacturer’s warranty requirements
  • When used in conjunction with Cleaner F3 gas savings of up to 15% can be achieved every time you heat your room
  • High performance, non toxic, environmentally friendly – NSF CIAS, KIWA and Belgaqua approved formulation


Application, Fitting & Dosing

One single dose of this product treats and protects a larger sized property with a heating system of 130 litres, up to 16 radiators or 250 sqm of underfloor heating and can be dispensed directly into a radiator air vent, system filling loop, or via a TF1 Filter using the appropriate adapter supplied with the product.

Fernox Express takes less then 30 seconds to dose the system without the need to drain down the system, saving time on-site. If dosing via a TF1 Filter, the filter should be emptied of any collected contaminants prior to treating with the product. In single feed indirect cylinder, e.g. Primatic; or similar, potable water chemicals must be used. Fernox recommends untreated or sludged systems are thoroughly cleaned and flushed in accordance with local regulations and legislation including BS 7593:2019 and Benchmark, using Fernox Cleaner F3 Express, before treating with Fernox Protector F1 Express, as existing debris can damage the installation.

Package, Handling & Safety

Fernox Protector F1 Express is supplied in 400 ml pressurised cans.

Fernox Protector F1 is classified as non-hazardous for human health, but as with all chemicals, keep out of reach of children. In case of contact with eyes or skin, rinse immediately with plenty of water.

Physical Specification / Properties

Protector F1 Express is a blend of inorganic and organic corrosion and scale inhibitors.
Form: Yellow liquid
Odour: Slightly aromatic
pH (conc): 8.4
pH (in-use): 7.8-8.5
SG: 1.17 at 20 °C


Fernox F1 Protector Express 400ml - New Formulation Protects Against Corrosion a

SKU: FER-62418
    bottom of page