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LSX External Leak Sealer 50ml


Quick Overview

LS-X is a proven, fast acting, silicone paste which is used as an effective external leak sealer and jointing compound. It is designed for use on hot and cold water services, including potable water.

  • 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


Application and Dosage

When sealing leaks, relieve the water pressure before application if possible. Whilst LS-X is setting, drain system if necessary. Apply LS-X direct from 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.

Physical Properties

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

Packaging, Handling and Storage

Fernox LS-X is supplied in 50ml tubes. Fernox LS-X is classified as a skin and eye irritant. 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.



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This product appears in the following categories:  Plumbing Consumables

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