Description
Leak Sealer F4 Express 400ml
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. 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. A leak can be quickly and efficiently sealed, without the need for a complete system drain down.
Physical Specification / Properties
Colour: White
Form: Viscous liquid
Odour: Faint
pH: 5.0 – 7.0
SG: 1.0 @ 20°C
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.
- Seeks out and seals inaccessible, internal microscopic leaks fast
- Quick and convenient – doses in 30 seconds – no need to drain down the system
- Safe to use – does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers
- Non-toxic, environmentally friendly formulation, compressed air propellant and 100% recyclable can
- Saves time and money on draining down and repairing.
- Add via a radiator, filling loop or TF1 System Filter – all adapters supplied
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 does Fernox Leak Sealer F4 Express do?
Fernox Leak Sealer F4 Express is designed to seal small, internal leaks and weeps in central heating systems. It prevents pressure loss and helps avoid costly boiler breakdowns by forming a polymer seal at the site of the leak.
2. How quickly does the leak sealer work?
The product is effective within 1 to 24 hours of application. Once it circulates through the system, it quickly locates areas of oxygen ingress and creates a durable seal.
3. Is it safe for my boiler and heating system?
Yes, the formula is specially developed to avoid causing blockages in pipework, pumps, air vents, or heat exchangers. It is safe for use in all sealed central heating systems.
4. How is the product applied?
The sealer can be added via a radiator, filling loop, or TF1 System Filter. All necessary adapters are included to make the application fast and simple, typically taking just 30 seconds.
5. Is the product environmentally friendly?
Yes, Fernox Leak Sealer F4 Express has a non-toxic, environmentally friendly formulation. It uses compressed air as a propellant and comes in a 100% recyclable can.
