weber Epoxy SI-2 Epoxy Injection - Slow - Weber

Weber Saint-Gobain - Official website of the company

weber Epoxy SI-2 Epoxy Injection - Slow

weber Epoxy SI-2 Epoxy Injection - Slow
weber Epoxy SI-2 Epoxy Injection - Slow


  • Low viscosity with good penetration
  • Good chemical resistance
  • High compressive strength
  • High tensile strength
  • Long pot-life

Epoxy SI-2 Epoxy Injection – Slow is a two component, solvent free epoxy injection grout.


Product description

weber Epoxy SI-2 Epoxy Injection – Slow is a two component, solvent free epoxy injection grout. The resin is based on Bisphenol A/Bisphenol F. The hardener is an aliphatic polyamine.

weber Epoxy SI-2 Epoxy Injection – Slow is delivered in sets of 1kg. Other quantities possible on request. The resin and the hardener are packed in separate containers.


Send eller last ned


Product specification

Colour Comp. A (resin) – Clear, transparent
Comp. B (hardener) – Clear, transparent
Mixing ratio Comp. A : Comp. B = 5 : 1 parts by weight
Comp. A : Comp. B = 4 : 1 parts by volume
Density 1070 kg/m3
Viscosity 5oC:   5000-6000 mPas
10oC: 800-1000 mPas
20oC: 100-150 mPas
Pot life 5oC:   320 minutes
10oC: 160 minutes
20oC: 70 minutes
Full cure 5oC:   28 days
10oC: 16 days
20oC: 7 days
Compressive strength 80 MPa
Flexural strength 44 MPa
E-modulus 2500 GPa
Bond strength To dry concrete : 4-4,5 MPa (concrete failure)
To wet concrete : 4-4,5 MPa (concrete failure)
Lowest recommended
curing temperature

Usage area

weber Epoxy SI-2 Epoxy Injection –Slow is specially developed for repair of cracks in cast concrete structures with the intention of rebuild strength, tighten against water leakage or protect against corrosion. It can be used in environment with very high humidity or even cracks filled with water. The long pot-life is feasible in higher temperatures or when a long time of application is required.


The components should be stored in a dry place in closed packages. Shelf life is minimum 12 months when unopened and stored correctly.


Pre-treatment of substrate

Before any repair work is carried out, an investigation should be made to establish if the repair is feasible. Samples should be taken from the concrete structure to ascertain the quality of the concrete, and to determine the depth and width of the cracks.

To prepare the concrete for injection, cut all surface cracks of major significance with a “V” notch rotary cutter to a depth of 6 mm and width 6-mm. Clean dust and loose particles with dry compressed air. Seal the “V” notched cracks with a thixotropic putty (weber Epoxy Putty). At the same time, insert 6-10 mm copper pipes or injection along the cracks at intervals of 1½ times the thickness of the concrete.


Resin and hardener must be thoroughly mixed before use. Recommended temperature on the components before mixing is min. 15oC.


After the sealing composition has cured sufficiently, i. e. over night, the injection can be carried out using pressure equipment capable of operation at pressures up to 2 MPa. This equipment can range from a simple hand operated gun to a metering, mixing, and dispensing machine.
The pressure pump may be fitted with a pressure release valve (for example set at approximately 0,7 MPa) feeding back into the reservoir.

In order to ensure that the maximum degree of penetration is achieved the injection sequence for any one joint or crack should commence with the floor, followed by the walls and then the ceiling. Always work from the lowest position and upwards. The epoxy is injected under pressure in one pipe until the material emerges from the adjacent pipe. The first injection point is then sealed and the injection equipment transferred to the next pipe, and so the operation is repeated until the entire area has been sealed in one operation.

Test cores may be taken to establish the depth of penetration of the epoxy. If the cores show that at minimum of 90 % of the crack volume has been penetrated, the repair is considered satisfactory. Vibration test meters have been used to assess the effectiveness of the repair. Using a jack-hammer as a vibratory source it has been found that on cracked concrete a variety of readings are obtained depending upon the siting of the vibratory source and the vibration meter, whereas after a satisfactory injection repair operation constant readings are obtained.


Tools must be cleaned with a suitable solvent, e. g. xylene, acetone, ethanol etc.


Safety instructions

Hazardous – contains highly alkaline binder. Before using weber Epoxy SI-2 Epoxy Injection – Slow the precautionary information submitted in Safety Data Sheet must be observed.


Since there are different conditions and requirements that apply in any case, Saint-Gobain Byggevarer AS cannot be liable for other than the information provided in this product datasheet. Examples of information and conditions beyond Saint-Gobain Byggevarer AS’s responsibility (if specially pointed out or not), involves storage, construction, preparation, how the product works together with other products, workmanship and locale conditions. The information provided in this product data sheet is based on our current knowledge and experience about the product. All of the above information must be considered as guidelines. It is the user’s responsibility to ensure that the product is suitable for the intended use, and also to perform acceptance check and self-inspection control. The user is responsible if the product is used for purposes other than recommended or for improper installation.