Soudal Soudapack WST

SOUDAPACK WST is a one-component, solvent-free, hydro-swelling sealant to prevent water leaks in the inside of pipes. Soudapack WST does not cure but remains permanently flexible, through which additional cables or pipes can be carried through at all times.

  • Water-tight, water-vapour-tight, and gas-tight up to 3 bar
  • Water impermeable
  • Swells in contact with water – to prevent leaking
  • Immediate seal of leaks
  • Does not harden

310 ml cartridges, 12 cartridges / carton



More Info


  • Watertight up to 3 bar
  • Gas-tight up to 3 bar
  • Permanently flexible
  • Immediate seal of leaks
  • No adhesive layer needed
  • No vapours, no solvents
  • Swells in contact with water
  • Water-impermeable
  • Does not harden
  • Indoor emission level of A+ (very low risk, very low VOC)
  • Easy to apply with standard caulking gun


  • Water-tight and gas-tight sealing in and around pipelines and cable penetrations
  • Sealing against groundwater and surface water ingress around pipes and cables through wall inlets below ground level
  • Sealing of wall penetrations inside building
  • Hermetic sealing of horizontal pipe and cable wall inlets


  • In the case of large spaces between pipe and inner walls, back fillings may be required. Use back paddings to create the application depth of minimum 12 cm.
  • Soudapack WST should be used on the inside of cable/pipe penetrations for flexible sealing.
  • For watertight and gastight seals around (and on the outside of) cable and pipe penetrations, Soudal Aquaswell is recommended.
  • A top layer of a water-resistant mortar (Soudaplug ST) to encapsulate Soudapack WST is recommend.
Product Video
Water-tight and Gas-tight Sealing of Pipe and Cable Penetrations

Soudal Aquaswell – Hydro-expanding PU sealant


Soudapack WST – Non-hardening, hydro-expanding sealant


Soudaplug ST – Rapid-setting cement mortar

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