PURINSEAL - Crack Injection

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Crack Injection

Polyurethane resin injection, also known as PU injection or grouting, is a waterproofing technique that prevents water from flowing through cracks and voids. This is an effective solution for crack leak sealing in concrete structures, tunnels, dams and mines.

Leaking concrete structures can be permanently repaired by crack injection techniques using polyurethane resin. Polyurethane resin reacts with water to form a watertight foam. Polyurethane resins vary in rigid and semi-rigid, flexible and semi-flexible foam forms. Chemical expansion of the foam is very effective in filling cracks in concrete as the resin reacts with water. Polyurethane resin plays an important role in preserving the concrete and rebar because leaking cracks in concrete walls cause corrosion of the steel and damage the structure.

PURIN offers a variety of polyurethane injection resins for crack injection solutions used in many different areas of application in a variety of structures such as tunnels, dams, mines, including basement walls, water and sewer tanks, manholes, parking garages, and other below grade structures. From fine hairline concrete cracks to large gushing leaks can be sealed with PURINSEAL product lines.

Choosing the right product for the areas of application plays a very important role in a long-lasting crack injection and leak-sealing applications. PURIN offers a wide product range varying degrees of properties such as viscosity, expansion rate, reaction time, flexibility and hardness. Please contact our PURIN technical experts for more information on the best product for your situation.

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Injection on Dilatation Joints

Our products used in dilatation joints are as followed:

If there is a lot of water in dilatation joints one-component products; if there is no water present or it is like a leakage two-component products are preferred.

Product Viscosity
(cP, 23ºC)
Mixing Rate Structure Starting
of Reaction
Ending
of Reaction
    PURINSEAL EN 106     500    Use with 10% catalyst        Creates a very flexible foam after contact with water        20 sec (sn)         100 sec (sn)    
 PURINSEAL EN 401  700 1 : 1    It does not swell in anhydrous environment (Shore 70A)    20 sec (sn) 40 sec (sn)

Injections in Cracks

Our products used in cracks are as followed:

One-component products are applied with one component injection machines. Two component products are applied with two component injection machines and they can also be applied with one component injection machines by expanding the pot life. All one component products can be used to stop water in crack injections, and afterwards PURINSEAL EN 401 or PURINSEAL EN 404 is used.

Injection Products Table

Product Viscosity
(cP, 23ºC)
Mixing Rate Structure Starting
of Reaction
Ending
of Reaction
    PURINSEAL EN 105     500  Use with 5% catalyst  Creates a flexible foam after contact with water     20 sec (sn)        100 sec (sn)   
 PURINSEAL EN 106  500   Use with 10% catalyst   Creates a very flexible foam after contact with water 20 sec (sn) 100 sec (sn)
 PURINSEAL EN 108  450   Use with 10% catalyst   Creates a rigid foam after contact with water 20 sec (sn) 270 sec (sn)
 PURINSEAL EN 111  800   Use with 10% catalyst   Creates a rigid foam after contact with water 20 sec (sn) 100 sec (sn)
 PURINSEAL EN 112  96   Use with 10% catalyst   Creates a rigid foam after contact with water 10 sec (sn) 90 sec (sn)
 PURINSEAL EN 113  150   Use with 10% catalyst   Creates a flexible foam after contact with water 10 sec (sn) 60 sec (sn)
 PURINSEAL EN 401  700 1 : 1 It does not swell in anhydrous environment (Shore 70A) 20 sec (sn) 40 sec (sn)
 PURINSEAL EN 402  325 1 : 1 It does not swell in anhydrous environment (Shore 70D) 20 sec (sn) 100 sec (sn)
 PURINSEAL EN 403  325 1 : 1 Creates rigid foam by itself in anhydrous environment 10 sec (sn) 80 sec (sn)
 PURINSEAL EN 404  325 1 : 1 Creates a rigid foam in contact with water 20 sec (sn) 100 sec (sn)
 PURINSEAL EN 405  325 1 : 1   Susuz ortamda %50 oranında köpük olusturur (Shore 70D)   40 sec (sn) 120 sec (sn)

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Ayşenur DEDE

 adede@purin.com.tr

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Aslı GÜRDAL

 agurdal@purin.com.tr