Defoamer for Aqueous Systems, Solvent- and VOC-free

Borchers® AF 1171 is a polysiloxane, VOC-free anti-foaming agent and defoamer. This defoaming agent is ideal for preventing paint production and millbase foaming in aqueous decorative and general industrial systems. Borchers® AF 1171 works in solvent- and water-based coatings.


Benefits of Defoamers for Aqueous Systems

Antifoams and defoamers like Borchers® AF 1171 provide foam control during paint production and millbase phases in aqueous coating systems. Borchers® AF 1171 improves gloss, substrate wetting, and color strength in pigmented systems. It avoids microfoam formation during manufacturing.

Borchers® AF 1171 is a mixture of foam destroying silicones and hydrophobic components. It is very efficient in the grinding stage​, increases density​, and works well when preparing pigment concentrates.



Ideal applications include a wide range of decorative and general industrial aqueous coatings. Borchers® AF 1171 antifoaming agent is effective in spray paints used on metal and concrete tile roofs when combined with Borchi® Gel 0621 rheology modifier.


defoamer for aqueous systems decorative, general industrial, metal and concrete tile roof coatings


  • Characteristic Data

    Appearancemilky white liquid
    Non-volatile contentMin. 98 % ISO 3251
    (1g, 1h, 125 °C)
    Density1.01 – 1.05 g/ml ISO
    2811-3 (25 °C)
    Viscosity210 – 290 mPa.s
    ASTM D 1638 (25 °C)
    Flash point250 °C
    Refractive indexNA

  • Features

    • Improves film gloss, substrate wetting, color strength in pigmented systems
    • Avoids microfoam formation during manufacturing
    • Easy to emulsify in water
    • Should be used in grinding step, but can also be added in let-down or post-add
    • Supports quick air release of entrapped air in the surface during application
    • VOC-free


  • Applications

    • Coatings based on

    • Water soluble alkyds
    • Polyurethanes
    • Styrenes
    • Straight and vinyl acrylates
    • Hydroxyl-bearing polyacrylates

  • Dosage

    The recommended dosage is 0.05 – 1.50 % Borchers® AF 1171 to the total weight of the formulation depending upon the
    binder system and which property is being addressed. The exact dosage should be experimentally determined. In
    pigmented systems, 2/3 of the defoamer portion should be added to the grind and 1/3 to the letdown.

  • Storage

    Protect from the effects of weathering and store at temperatures between 5 and 30 °C. Once opened, containers should be
    resealed immediately after each removal of the product. Separation may occur, mix well before use.

  • Safety

    Please refer to our safety data sheet for information relating to product safety.

Registration :

For chemical inventory status, please review section 15 of the current SDS.

Click here to access the SDS portal.

For additional regulatory information, please contact [email protected].