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Perma Inject Hydro Gel


Perma Inject Hydrogel is a polyurethane injection grouting system. It is a single component product. This product reacts with water to form tough flexible polyurethane foam or an elastomeric gel depending upon the amount of water used in the reaction. This product can be injected into the concrete of RCC structures using a pump where resin is one componenet and the other component is water. Perma inject hydrogel is used in areas of heavy leackages, expansion joint filling cavity filling, in structural concrete and for creating screens.
Perma Inject Hydro Gel


When injected in the concrete Perma Inject Hydrogel reacts with water or moisture to form semi rigid foam or a flexible gel depending upon the quality of water used. It also fills up all capillaries and honeycombs in the concrete to discourage accumulation of water in these pockets at a later stage. Perma Inject Hydrogel is more suited for heavy engineering applications.


Perma Inject Hydrogel seals leakages in all difficult situations such as basements, tunnels and heavily leaking massive structures.

Perma Inject Hydrogel is free from solvents and fillers. It is resistant to hydrolysis and is suitable for use in potable water tanks.

Perma Inject Hydrogel stops the leakage then and there only instantly after injection, there is no waiting period for curing time etc.


Clean the surface to be waterproofed and remove the plaster or lose concrete in the area. Assess the leaky area and decide the injection nozzle pattern. The leakage could be either from a horizontal or from vertical crack. Drill holes on either side of the crack at an inclination of 45° inclined towards the centre of the crack at an interval of 8 inch centre to centre. Always start from the lowest point and progress upwards. In the drilled holes fix the packers effectively. In weak concrete the drilled holes becomes larger than desired, in such cases the packer may not fit tightly to a leak-proof fit. If this happens grout the surroundings of the packers with a stiff consistency paste of Perma Plug.


Perma Inject Hydrogel consists of a MDI based solvent free, isocyanate component and will only react when it comes in contact with water to produce foam or gel depending on the proportion of water used.

Polymer: water, 1:1 to 1 :5 produces impregnable elastomeric foam
Polymer: Water 1: 9 to 1 :15 produces a highly resilient elastomeric gel.


  • Heavy Water Leakages
    For arresting heavy water leakages use resin and the water in the proportion of 1:1 and inject into the fixed packers at desired interval till the leakage stops.
  • Expansion Joints
    Because of good flexibility and adhesion Perma Inject Hydrogel can be used to fill up the expansion joints in the buildings. For this use resin: water in the ratio 1: 4 or 1 : 5.
  • Gel Membrane
    Because of the low viscosity of the water / polymer mixture, it can be used as a liquid but solidifying gel membrane applied on the positive side of leakage from the accessible negative side. The ratio of hyrogel to water in this application shall be 1:10. This gel fills all voids from the backfill side or from underground side.
  • Masonry walls
    Because of low viscosity with a relatively long pot life Perma Inject Hydrogel can be used to inject-in the masonry walls as a vertical barrier to fills voids and joints to safeguard against water entry and spoiling of the paint on the interiors. For this use resin and water should be in the ratio of 1 : 12 or 1:13 This can be injected using single component pump.


Specific Gravity : 1.10. to 1.12
Viscocity : 600 to 800 mPa.s
Flash Point : > 150°C .


RATIO Hydrogel : Water CREAM Seconds GEL Seconds END PRODUCT
1: 1 20-30 50-60 Foam
1:4 60-80 110-130 Strong Gel
1:5 80-100 120-140 Strong Gel
1:10 3-4 min 6-8 min Gel
1:12 4-6 min 14-16 min Gel
1:15 14-16 min 35-40 min Soft Gel


The workers should use mask and hand gloves to avoid direct breathing of the toxic vapors and to avoid direct contact with the skin. Ventilate the working area adequately maintain over all hygienic conditions. Clean the tools and the pumps immediately after use.


Perma inject Hydrogel is available in packing of 25 Kg and 5 Kg tins.


Perma inject Hydrogel has a shelf life of 9 months from date of manufacture. These products are both temperature and moisture sensitive. Hence it is of utmosrt importance that these products are stores in DRY CONDITIONS BETWEEN TEMPERATURES 10 to 30 degree.


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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