Dryflex WS

With our Dryflex WS range we have turned the usual water-resistant properties of TPEs on their head to engineer materials that swell when immersed in water.
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Hydrophilic TPE

Dryflex WS are a range of thermoplastic elastomers (TPE), which contain hydrophilic particles. They swell at a controlled rate and percentage when immersed in water. When there is no longer water present the compound shrinks back to its original size, a process of expansion and contraction that can be repeated. The materials have solid structural integrity; unlike many of the equivalent clay based products which can erode over time.

Dryflex WS - TPEs that Swell in Water

How would you use it?

Dryflex WS TPE - How would you use it?
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Dryflex WS+

We’ve further expanded the possibilities with the development of the Dryflex WS+ grades. These materials are designed for applications in high saline environments, such as sea walls, defences and water-stop construction. For example, in 8% saline solution at 23ºC Dryflex WS+ 51446 achieved double the volume swell of Dryflex WS 25E950 after 21 days. Dryflex WS+ 51446 had a volume swell around 300% compared to 150% for Dryflex WS 25E950.

Dryflex WS+ - Hydrophilic TPEs for Waterstops

Key Properties

Dryflex WS and WS+ materials are used in applications to form a positive seal and prevent the ingress or exit of water. We have also developed softer grades which offer excellent drapability. They are an ideal choice for water stop applications where the profiles may be coiled or need to be fitted around complex structures.

Compounded in any colour, the water swellable TPE is recyclable in closed loop systems and can be processed using conventional plastic fabricating methods, including extrusion and injection moulding.


Applications include

  • Waterstops
  • Water treatment plants
  • Tunnels, drains & sewers
  • Water tanks
  • Seals
Hydrophilic TPEs for Water-Stops

Hydrophilic TPE - How does it work?

Fig 1 : The hydrophilic ingredient is compounded into the Dryflex WS TPE at the time of manufacture.

Hydrophilic TPE - How it works - during

Fig 2 : After immersion in water the Dryflex WS TPE will expand uniformly, at a controlled rate and percentage.

Hydrophilic TPE - How it works - after

Fig 3 : When there is no longer water present the Dryflex WS TPE shrinks back to its original size.

Our Dryflex WS expert

Martin Bradbury

Martin Bradbury

Senior Key Account Manager for HEXPOL TPE Ltd

+44 161 654 2332


You can also visit our Downloads page for more brochures and information.

Dryflex WS Product Guide

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