Description
Leak Sealer F4 is a internal leak sealer developed for use throughout a central heating system to seal small, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown. A leak can be quickly and efficiently sealed, without the need for a complete system drain down.
Features:
- Seeks out and seals inaccessible, internal microscopic leaks fast.
- Once dispersed within the system, the product finds the area of oxygen ingress and forms a polymer to seal the pinhole.
- Effective within 1-24 hours after application, the unique sealing efficiency of this market-leading water treatment chemical has been proven to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices.
- Ideal for reducing pressure loss from sealed systems.
- Saves time and money on draining down the system and repair costs.
- Safe to use – does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers.
- Designed to be left permanently in the system – compatible with all metals and materials, including aluminium.
- One 500ml recyclable bottle treats up to 130ltr of system water (16 radiators) and the equivalent of 250m² of underfloor systems.
- The recommended ‘in use’ concentration of the product is 0.385%.
Technical data:
- Brand – Fernox
- Range – F4
- Product Type – Leak Sealer
- Size – 500ml
- Colour- Off White
- Odour – Faint
- Form – Viscous Liquid
- pH – 5.0 – 7.0 (Conc) / 7.0 – 8.5 (In Use)
- SG – 1.0 At 20°C
Application:
- For open vented systems add via the feed and expansion tank.
- For sealed systems add via a suitable dosing point (e.g. a towel rail or an in-line system filter).
- Alternatively, use a suitable dosing vessel to inject the product into the system.
- In single feed indirect cylinders, e.g. ‘Primatic’ or similar, potable water chemicals must be used.
Standards & Certifications:
- Classified as non-hazardous
Please Note:
- Classified as non-hazardous, but as with all chemicals, care should be taken. Keep out of reach of children.





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