Drymix Airvoid Management Defoamer

Stay strong with our defoamers

Not just hot air


The entrainment of uncontrolled air into cement and gypsum based mortars is unavoidable and leads inevitably to a loss of quality in high performance systems. Undesired air voids weaken the system resulting in lower mechanical strength and reduced abrasion resistance. In addition, surface air voids often compromise the desired quality requirements of a product.


Defoamers are preferably used for the prevention and removal of large air inclusions at the concrete’s surface and for rapid foam collapse in aqueous formulations. If, on the other hand, it is necessary to remove finely distributed air from a system, deaerators are the preferred alternative. However, practice has shown that a clear differentiation between defoamers and deaerators is usually not possible. Most defoamers also have a deaerating effect to some extent and vice versa.

How defoamers work can be best explained in the images below. Defoamers and deaerators are active at the air/water
interface; they cause the stabilized structure of air voids to rupture in a liquid medium, thus allowing air to escape.

Defoamers are characterized by:
  • Low surface tension

  • Insolubility in the formulation to be defoamed

  • Positive spreading coefficient

  • Positive penetration coefficient

Evonik Antifoams
Optimized aesthetics with improved durability

External appearance and mechanical strength play a crucial role nowadays, with architecture being more sophisticated and creative than ever.

With the SITREN AirVoid® brand, we offer highquality defoamers that allow air voids to be selectively removed from the system. This not only results in easier workability and an optimized surface finish but also in higher mechanical strength. Mortar systems defoamed with our products meet the highest demands of aesthetics and durability.

Application areas:
  • Floor systems (e.g. leveling compounds, screeds and decorative coatings)

  • Tile adhesives

  • Grouts  (e.g. masonry mortars and joint fillers)

  • Grouting and repair mortars

  • Thermal insulation systems (EIFS/ETICS)

COMPARE THE PROPERTIES AND BENEFITS OF OUR PRODUCTS IN OUR PRODUCT PORTFOLIO OVERVIEW:
Where Powder meets Power. Additives for the Dry Mortar Industry

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