Estop Rubber Waterstops
Estobond PCA
Show all

Estopper Hydroswell S47

Swellable Hudrophilic Waterstop

Download Data Sheet


Estopper Hydroswell S47 is a unique sealing compound which expands in a controlled fashion when exposed to moisture, forming a compression seal in concrete joints. Estopper Hydroswell S47 is ideal for use in horizontal and vertical construction joints for cast in–situ concrete structures.

Estopper Hydroswell S47 is manufactured utilizing a specialized mixing process which encapsulates hydrophillic materials into a rubber based creating a controlled, moisture activated seal. This product has the structural integrity of a rubber–based sealant, the features of a butyl sealant, as well as the ability to expand to create a self–healing joint material.

Estojoint has been tested in accordance to ASTM D297, on Waxy Hydrocarbon Content; ASTM D217, on Cone Penetration, ASTM D5385, on Water Head Pressure, and complied with the specification in this data sheet.


Typical applications for Estopper Hydroswell S47 include:

  • Tunnels ⁄ Retaining walls ⁄ Basements
  • Underground structures
  • Pits ⁄ Box culverts
  • New to old concrete manholes
  • Poured in–situ construction joints
  • Above and below grade precast panels


  • Excellent for applications to rough concrete surfaces.
  • Limited loss of integrity of waterstop.
  • Allows concrete to gain strength before expansion.
  • For use in horizontal and vertical construction joints.
  • Excellent adhesion to Estopper Hydroswell S47 primer / adhesive.
  • Can be bedded into wet concrete.
  • No compaction or displacement problems.
  • Unaffected by repeated wet and dry cycles.
  • Has the ability to bond to both concrete surfaces.
  • No on–site welding required as with PVC waterstops.
  • Very easy to handle and install.
  • No split forming required.
  • Non toxic and requires no special handling.

Standards Compliance

  • ASTM D297 – 93 Clause 24
  • ASTM D217 – 02
  • ASTM D5385 – 93

Physical Properties

Colour Black
Size, mm 25 x 19
Specific Gravity 1.40 – 1.45
Volatile Matter 1% maximum
Waxy Hydrocarbon Content
ASTM D297–93 Clause 24
47% minimum
Block Penetration @ 25°C,
180 gm; 5 sec ASTM D217–02
40 ± 5
Water Head Pressure
ASTM D5385–93
Tested to 60m
Application Temperature –22°C to 52°C
Service Temperature Range –34°C to 82°C

Application Instructions

Surface Preparation

Estopper Hydroswell S47 is to be adhered to the first pour of concrete with Estopper Hydroswell S47 Adhesive. A clean, dry surface, free from dust, debris etc. is required. Estopper Hydroswell S47 requires a minimum 50mm concrete cover from the outside edge.

Brush off any dust or debris from the surface where the Estopper Hydroswell S47 is to be applied. Brush a coat of Estopper Hydroswell S47 Adhesive at 30mm wide onto the concrete surface and one coat to the surface of the Estopper Hydroswell S47. Wait for both surfaces to be touched dry before applying the Estopper Hydroswell S47.


With the use of your thumbs or heel of your hand, firmly press a continuous bead of Estopper Hydroswell S47 into position, making sure you get full contact with the adhesive on the concrete surface. Do not stretch the Estopper Hydroswell S47 waterstop when applying it into position. There must be no visible gaps under the Estopper Hydroswell S47.

The protective paper layer cover on the Estopper Hydroswell S47 can be removed anytime prior to the second pour of concrete taking place. Placement of the second pour of concrete can be applied once the Estopper Hydroswell S47 Adhesive has dried. Upon pouring, make sure the concrete is properly compacted and vibrated around the Estopper Hydroswell S47.

If Estopper Hydroswell S47 has been exposed to water/moisture prior to the second pour taking place, check for pre–expansion. If the product has pre–expanded, then remove that section and replace with a new length of Estopper Hydroswell S47.

For vertical joints and overhead applications, it may be necessary to also secure the Estopper Hydroswell S47 with nails, placed approximately every 250mm apart. This is usually only required as extra security if you need to pour concrete prior to the Estopper Hydroswell S47 Adhesive drying completely.

Packing & size

Estopper Hydroswell S47 25mm x 19mm x 5mr roll (6 rolls per carton)
Estopper Hydroswell S47 Adhesive 1 Litre cans


Estopper Hydroswell S47 Adhesive 20 – 30 metre per litre

Technical Support

Estop offers a technical support package to specifiers, end–users and contractors, as well as on site technical assistance.


Estopper Hydroswell S47 should be stored in packaging in dry conditions under ambient room temperature. The product will have shelf life of 12 months. If stored in extreme heat locations the shelf life may be reduced.

Additional Information

Estop manufactures and offers a wide range of complementary products, which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.