Batimix IWR 420-S

Liquid, integral water-repellent with plasticizing effect


BATIMIX IWR 420-S is a liquid integral water-repellent admixture. It is used in all types of concrete mixes. It reduces absorptivity and water penetration from the surrounding environment. The product is formulated from carefully selected inorganic stearates and plasticizing polymers to improve concrete workability. It is supplied in powder-form, upon request.

Main Purpose

BATIMIX IWR 420-S significantly decreases the water permeability of concrete by creating a network of insoluble water-resistant material within the pores of the cement matrix. The admixture incorporated in the mix design leads to the formation of an effective internal barrier. This prevents water transmission throughout the concrete. The mixing-water demand decreases due to the plasticizing effect of the polymers incorporated in the concrete. This yields a denser, more durable concrete.

Applications using this product include all types of plain and reinforced concrete castings such as precast, ready-mixed, lightweight, pumped, and shotcrete.


Concrete prepared with BATIMIX IWR 420-S is characterized by the following:

In the plastic state:

  • No detrimental effect on setting times
  • Reduced amount of mixing water for constant workability and improved workability for constant W/C

In the hardened state:

  • Minimized water permeability, capillary suction, and moisture transfer
  • No negative influence on drinking water in concrete storage tanks
  • Reduced potential for efflorescence and probability for rebar corrosion
  • Reduced attack of soluble salts and aggressive ions


Liquid brown


  • 1MT Cubitainer
  • 200KG Metallic Drum
  • 20KG Metallic Pail
  • 4KG Metallic Pail

Health & Safety

BATIMIX IWR 420-S is not considered a hazardous product. However, it should not be swallowed or allowed to come into contact with skin and eyes. Suitable gloves and goggles should be worn. For additional information, kindly refer to the product’s Material Safety Data Sheet.