Description
F4 500ml Fernox Leak Sealer
Fernox Leak Sealer F4 500ml 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.
Physical Specification / Properties
Fernox Leak Sealer F4 is a polymer emulsion.
Colour: Off white
Odour: Faint
Form: Viscous liquid
pH (conc.): 5.0 – 7.0
pH (in-use): 7.0 – 8.5
SG: 1.0 at 20°C
- Ideal for reducing pressure loss from sealed systems
- Seeks out and seals inaccessible, internal microscopic leaks fast
- 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 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.
At Heating and catering parts,
We certainly strive to provide the best possible customer experience. Consequently, we understand that sometimes a product may not meet your expectations or requirements. That is why we offer a comprehensive 30-day return policy to ensure your satisfaction. Please read our full Return Policy
We appreciate you buying from our store. Usually, If your order is received by 1:00 p.m. EST (Monday–Friday), we will ship the item the same day. You can count on us to deliver quickly and safely. In other words, we take pride in our prompt and trustworthy service and will do everything we can to ensure the safe arrival of your package. Please note that weekends are not included in our next-day delivery guarantee. Delivery for orders placed on Fridays (the next day) is on the following Monday. At the same time select the Saturday delivery option at checkout if you’d like your purchases delivered on a weekend day.
In a word thank you for choosing us!
Frequently Asked Questions
1. What is Fernox Leak Sealer F4 used for?
Fernox Leak Sealer F4 is designed to seal small, inaccessible leaks and weeps within sealed central heating systems. It helps prevent pressure loss and reduces the risk of boiler breakdowns.
2. How does Fernox Leak Sealer F4 work inside the heating system?
The sealer circulates with the system water, seeking out microscopic leaks. It seals them quickly without causing blockages in pipework or vulnerable boiler components such as pumps, air vents, and heat exchangers.
3. Is Fernox Leak Sealer F4 safe to leave in the system permanently?
Yes, it is designed to be left permanently in the heating system. It is fully compatible with all commonly used metals and materials, including aluminium, and ensures ongoing leak protection.
4. How much system water does one 500ml bottle of Fernox Leak Sealer F4 treat?
One 500ml bottle treats up to 130 litres of system water, which is the equivalent of 16 radiators or approximately 250m² of underfloor heating systems.
5. Does Fernox Leak Sealer F4 require draining the system before use?
No, one of the key advantages of Fernox Leak Sealer F4 is that it saves time and money by sealing leaks without the need to drain down the central heating system.
