1. Fernox 61016 LSX 50G External Leak Sealer

    Model: 61016
    Availability: same day dispatch Same day dispatch if ordered before 1:00 pm
    Price:   £9.99

Fernox LS-X  External Leak Sealer and Jointing Compound. It’s a silicone paste used as an external leak sealer and jointing compound.


Ideal for use on compression joints and screwed fittings
Never sets rock hard, joints can easily be undone
Ready to use, no mixing
Does not shrink or crack with age
Suitable for use from below freezing point to above
boiling point of water
Completely safe to use with drinking water
WRAS – Approved Product

Physical Properties

Fernox LS-X contains Acetoxysilane.
Colour: Milky - white
Form: Paste
Odour: Mild. Acetic
pH: <3
SG: 1.0 at 20°C

Application and Dosage

When sealing leaks, relieve the water pressure before applying and whilst LS-X is setting, draining system if necessary. Apply LS-X direct form the tube and mould into shape using a spatula or knife previously dipped into soapy water (to prevent adhesion or dragging). Replace cap immediately after use. Allow a minimum of 1 hour to set. Time required depends on thickness applied. Spraying with water speeds curing. 

LS-X may be used as a jointing compound on hot and cold water services, including potable water, in place of traditional materials. Reinforcement is generally not required, but Hawk Special fibre may be used on larger pipe sizes. 

The use of reinforcement is advisable for larger leaks and high pressures.

Packaging, Handling and Storage

Fernox LS-X is supplied in 50ml tubes.
Fernox LS-X is classified as irritant. Irritating to eyes. 
Keep out of reach of children. Avoid contact with skin. 
Use only in well ventilated areas.
We recommend the use of gloves with this product, as it may cause skin irritation.