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Hydrotank 308 Stopaq Sealant

Save £12.48 inc.VAT

Sale price£46.52 inc.VAT Regular price£59.00 inc.VAT


Single-component, highly flexible compound used for sealing conduits and pipes through service duct sleeves. An incredibly effective pipe sealant, the compound seals around numerous services within the sleeve, even where significant water ingress exists.

The unique pipe sealant compound never cures, remaining permanently flexible, allowing for new services to be simply pushed through the existing repair and resealed.

HydroTank 308 Stopaq swells by up to 10% when in contact with water and will seal the service duct against water pressure of up to 3m, forming a very effective seal against gas and water vapour.

HydroTank 308 Stopaq adheres to both wet and dry surfaces of concrete, mortar and plastic without the need of a primer. The swelling characteristics do not create any stresses to the service joint or the structure.

Once the service sleeve is sealed, HydroTank 308 Stopaq Mortar is used to cap the installation. The mortar is a fibre reinforced and non-shrinking product specially produced for use with HydroTank 308 Stopaq, that can receive new cables or conduits without the use of power tools.

Key Benefits
  • Fast and easy to apply.
  • The sealing remains permanently flexible.
  • Does not demand special tools for application.
  • No material waste – paste re-usable.
  • Immediate sealing: no curing time needed.
  • Provides permanent and optimal sealing of the service duct.
  • No fumes, no chemical reactions.
  • Adjusts to movements of pipes and cables.
  • Allows adding and removing of conduits at any time.
Typical Applications
  • Wall inlets below ground water level – HydroTank Stopaq is suited for sealing against ground and surface water intrusion around pipes and cables, leading through building wall penetrations into basements and other earth retained structures.
  • Sealing of running water leaks – For permanent stopping of ground or surface water leaks through cable and pipe wall penetrations.
  • Wall penetrations inside buildings – Permanent sealing and protection of wall penetrations against gas or flooding is obtained with HydroTank 308 Stopaq together with the HydroTank Stopaq Mortar on either side of the wall.
  • Multi pipe & cable inlets – HydroTank 308 Stopaq sealing compound is excellent for hermetic sealing of multipurpose, horizontal lead-through wall inlets, where several pipes and cables are coming through one opening.

Product Data

Code: 308-S

Packaging: HydroTank 308 Stopaq - 0.53kg tubes = 0.4l. HydroTank 308 Stopaq Mortar - 0.5kg tubs = 0.6l

Colour: Green

Technical Data
Features Result
Material Synthetic Polyolefin Compound
Colour Green
Specific Gravity 1.2 to 1.5
Pack size – Cartridge 0.4 Litres
Pot life None
Shelf life None
Moisture Absorption (ASTM D570) 5 – 20%
Gap filling 10 to 40mm
Flash Point 170
Installation Temperature 5ºC to 35ºC
Service Temperature -20ºC to +35ºC


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