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Home / Products / Hydrophilic Waterstop

Hydrophilic Waterstop

Hydrophilic rubber waterstop strip that swells on water contact to seal construction joints.

Swells 200%+Construction JointsSelf-SealingCold-Joint Proven
SWELLING200–400%
CROSS-SECTION20×5 / 20×10 mm
FIXAdhesive or mechanical
SHELF LIFE24 months
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↓ Download Datasheet (PDF)

Overview

Swells on water contact. Permanent joint seal.

Hydrophilic Waterstop is a hydrophilic rubber waterstop strip installed in concrete construction joints. On contact with water, the rubber compound swells 200–400% by volume, applying compressive pressure against the joint surfaces to create a permanent watertight seal.

Specified for cold joints, pour-and-stop construction sequences, and pipe penetrations where conventional dumbbell-style PVC waterstops cannot be cast in.

Key Features

  • Swells 200–400% on water contact
  • Self-sealing – accommodates joint imperfections
  • Fast and simple installation – adhesive or mechanical fix
  • Suitable for static and lightly dynamic joints
  • Resistant to fresh water, sea water, and most chemicals
  • Available in multiple cross-sections for different joint widths

Technical Specs

Technical Specifications

All values measured at 23°C unless noted. Full test data available in the datasheet.

PropertyValueUnit
FormContinuous rubber strip–
CompositionHydrophilic synthetic rubber + bentonite–
ColourBlack / Red–
Cross-section sizes20×5 / 20×10 / 25×20mm
Density1.25 ± 0.05g/cm³
Hardness (Shore A)55 ± 5–
Tensile strength≥ 4MPa
Elongation at break≥ 400%
Swelling capacity200–400%
Swelling time (full)48–96hours
Hydrostatic resistanceUp to 6bar
Service temperature−20 to +80°C
Packaging10 / 20 m rolls–
StandardsEN 12390-8 · ISO 11341–

Applications

Where this product is used

Five typical site applications where our crews specify this product.

🧱

Construction cold joints

Sealing of horizontal and vertical construction joints in concrete pours.

🚇

Tunnel segment joints

Secondary sealing of precast tunnel segment joints.

💧

Water tank construction

Joint sealing in cast-in-situ water tanks and reservoirs.

🔌

Pipe penetrations

Annular gap sealing around pipe penetrations through walls and slabs.

🏊

Pool construction joints

Cold joint sealing in cast-in-situ swimming pool shells.

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