Fernox Leak Sealer F4 500ml Central Heating Leak Sealer 56603

Key Features

• Seals small, inaccessible internal leaks and weeps


• Helps reduce pressure loss in sealed central heating systems


• Effective within 1 to 24 hours


• No need for a complete system drain down


• Designed to remain permanently in the heating system


• Compatible with all common system metals and materials, including aluminium


• Does not cause blockages in pipework, pumps, air vents or heat exchangers


• Suitable for central heating systems and underfloor heating


• 500ml bottle treats up to 130 litres of system water


• Equivalent to up to 16 radiators or 250m² of underfloor heating


• Non-hazardous formulation

Technical Specifications

• Brand: Fernox


• Product: Leak Sealer F4


• Product Code: 56603


• Volume: 500ml


• Type: Internal central heating leak sealer


• Form: Viscous liquid


• Colour: Off white


• pH (concentrate): 5.0–7.0


• pH (in use): 7.0–8.5


• Specific gravity: 1.0 at 20°C


• Treatment volume: Up to 130 litres


• Radiators: Up to 16


• Underfloor heating: Up to 250m²


• Unit weight: 0.60kg


• Dimensions: 182 x 88 x 52mm


• Classification: Non-hazardous

Application

For open-vented systems, Fernox F4 can be added via the feed and expansion tank. For sealed systems, it can be added through a suitable dosing point, such as a towel rail or compatible in-line system filter, or injected using a suitable dosing vessel.

F4 is intended for sealing internal leaks within central heating systems. For external leaks from pipes and fittings, Fernox recommends a dedicated external leak sealer such as LS-X.

Always follow the manufacturer's instructions when dosing and treating a heating system.

Fernox Leak Sealer F4 is supplied in a 500ml recyclable bottle.