Safari also supply Form Tie Waterstops which are produced from a unique hydrophilic rubber sealing compound.

This system seals the conduit used for formwork tie bars both internally (with swellable plugs) and externally with a swellable ring to ensure water-tightness in water-excluding areas such as retaining walls, tunnels/subways, underground car parks, basement walls and manholes/pits as well as water-retaining structures like tanks, reservoirs, dams, pools, bund walls and sewage/water treatment plants.

These expand in a controlled fashion when exposed to moisture to form a compression seal inside or around the form-tie system in the concrete structure, to give a permanent flexible watertight seal.

Other advantages include:

• Available in many different sizes, shapes and profiles to suit the formwork form-tie system to be used.

• Ability to expand up to 400% in contact with potable water and over 200% expansion in salt water.

• Has been tested to withstand over 50 metres of hydrostatic water head pressure. (Test report available upon request)

• Non-toxic and can be used in potable water structures.

• Unaffected by repeated wet and dry cycles.

• Fast and simple to install.