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Perma Hydroswell



Conventional pre-formed water bars have not been user friendly and often failed, because it hindered the concreting because of its bulky size in the shutter and the nailing of the water bars to the shutters, to keep them in position, Punctured the water bars and made them ineffective. Keeping these in view Perma introduces user friendly and most effective water bars for construction joints which swell in the centre of the construction joint post construction under pressure when it comes in contact with water from leakages effectively blocking the leakages. Perma Hydroswell is a neoprene based hydrophilic construction joint water bar which expands to 250% of its original volume in the construction joint when it comes in contact with water post construction.


Perma Hydroswell is user friendly. It only needs nailing in position at the centre of the construction joint just before subsequent pour.

Expanded hydroswell is highly flexible and absorbs all deflections and movements in the structure during and post construction.

The product is highly chemical resistant and resistant to hydrocarbons as well.

It is effective against potable water, hard water and saline water as well.

It can be easily installed with nails.


Make sure that the concrete is dry. Clean the surface and make it smooth, free from any loose material.

Just before the subsequent lift of concrete is poured, nail Perma Hydroswell at the centre of the construction joint at an interval of 30 centimeter C/C.

When one piece of Hydroswell has to be joined with the subsequent one at the end of the length do not overlap Hydroswell but lay it close to the end in a butt joint.

Perma Hydroswell is supplied with a water retardant coating to guard against premature expansion or the swell of the product during construction. It is still recommended that the product is not used during rainy spells.


Form : 20 mm x 5 mm section in roll form
Color : black color with water retarded coating
Density : 1.4 gms/cc
Hardness : 50 HAD(ASTM D 2240)
Swelling : 250% of the initial volume (ASTM D 471)
Expansion In Salt Water With 5% Nacl : 210% after 15 days & 225 % after 30 days
Installation Temperatures : -15 to +50°C


Perma Hydroswell is available in roll form of 50 metre length.


Perma Hydroswell has a shelf life of 24 months if stored in standard conditions of storage.


PERMA warrants that all products are free from any defects of manufacture and comply with the specifications given in their respective technical data sheet. No warranty can be given as to the results of use because conditions of use, such as site conditions, surface preparations, workmanship, weather, structural issues and other factors are beyond the control of PERMA. Purchaser agrees to seek the advice of qualified professionals to carry out tests & take trials to determine the suitability of products for their intended purpose prior to full scale usage of PERMA products and assumes all risks.

The company does not assume any liability for unsatisfactory results, arising from the use of our products. Purchaser’s sole liability is limited to replacement of product or refund of the purchase price paid if any product proven defective. No other warranties, express or implied, shall apply including any warranty of merchantability or fitness for a particular purpose.
PERMA shall not be liable for any consequential damages arising from the use of our products for unsatisfactory results.

The information supplied in this datasheet is based on our experience through extensive research and is given in good faith in order to help prospective users. We reserve the right to update the information provided in our technical data sheet at any time without prior notice within the scope of technical progress or new developments.

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