Concrete Repair

Injection Resin

Monneli Betothane 120

Rigid Polyurethane Injection Resin

BETOTHANE 120 is a fast reacting polyurethane foam that is mainly used to act as a waterstop for the sealing of leakages or to stop active water leaks with a flow and/or high hydrostatic pressure.
BETOTHANE 120 provides excellent adhesion to mineral construction materials such as concrete, bricks, metals and certain plastics.
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Technical Information
Product Description

BETOTHANE 120 is a low viscosity, MDI-based water reactive polyurethane injection resin.It forms a rigid hydrophobic seal when in contact with water.


BETOTHANE 120 when in contact with water forms a carbon dioxide gas that produces a swelling pressure thus making the resin to expand into foam sealing all water penetration.

  • Penetrates even in deep fine cracks
  • Does not shrink after curing
  • Excellent water sealer
  • The reaction speed can be controlled by varying the amount of catalyst
  • Forms a hard sealing with high strength in cracks or joints
  • Does not shrink, therefore volume stays the same
  • Excellent adhesion to concrete
  • Expands up to 2000%
  • Chemically resistant against water, weak acids and alkali, mineral oils, fungus and bacteria, ground water, sea water and petroleum products
Packaging, Coverage / Consumption


  • BETOTHANE 120 is supplied  in canisters of 20Liter  for each component.
  • BETOTHANE 120 Catalyst in a box of three 1 Liter PE bottles.
  • BETOTHANE 120 Additive  in a box of three 1 Liter PE bottles.
Shelf Life & Storage


Keep the product in dry and covered shed with a temperature between +10°C and +30°C.

If stored properly, BETOTHANE 120 has a shelf life of 12 months.

Technical Properties




Mixing ration (p.b.v.)


Density at 20°C (DIN 53 479)

1.13 kg/L

Viscosity at 20°C (DIN 53 018)

200 ± 50 mPa.s

Compressive strength (DIN EN 196 T1)

Approx. 40 MPa

Slant shear strength (BS 6319, Part 4)

Approx. 13.3 MPa

Flexural tensile strenth (DIN EN 196 T1)

Approx. 3.5 MPa

Shore A hardness (ISO 868)

Approx. 90

Volume expansion in contact with water

1-10 times

Application time

30 seconds

Application temperature

+6°C to 35°C


All values are subject to 5-10 % tolerance

Application Information
Instructions for use


Mix Resin (Part A) and the Catalyst (Part B) thoroughly.  The components are mixed in the mixing head of a two-component injection-pump, using a suitable static mixer.

Because of the low viscosity, the resin will penetrate deep into the cracks. BETOTHANE 120 polymerizes into a rigid hydrophobic foam.

Clean the used tools with SOLVENTE 10 every time there is a need to stop the work for more than 15 minutes and immediately after completing the job and before the product dries.

BETOTHANE 120 could easily react with water or humidity in the air and forms CO2 gas that could build up pressure in the packaging that has been opened.

Additional Information
Health & Safety

Wear gloves, goggles to avoid any contact with eyes and skin. In case of contact in the eyes and skin, wash abundantly with warm water and consult a doctor. Ensure adequate ventilation at working place.

additional materials
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Technical Properties Sheet
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