Rheology Modifier for Anti-Sagging and Spray Application

Borchi® Gel 0621 is a non-ionic, polyurethane-based rheology modifier for anti-sagging and spray application. It is a low shear range associative HEUR thickener for water-based coating systems. This product contains no emulsifiers and is tin-, VOC- and APEO-free. It is 30 % active in water.


Benefits of Rheology Modifiers for Anti-Sagging and Spray Application

Borchi® Gel 0621 develops viscosity stability and pseudoplastic flow behavior. Depending on the type of binder used and other components of the system, it produces a pronounced shear-thinning flow behavior by means of a non-covalent network with binder particles and pigments. As a rheology modifier for anti-sagging and spray application, this solution enables the application of thick layers on vertical surfaces. Borchi® Gel 0621 effectively prevents sagging and does not yellow or cause chalking in cured film.


Other Additives for Spray Paint Application

Other additives for spray paints include Borchi® Gel 0620 rheology modifier. Both are designed for water-based paints.


Other HEUR Thickeners from Borchers

Low Shear

Medium Shear

High Shear



Applications include industrial and decorative coatings that are applied via spray gun. Borchi® Gel 0621 is suitable for brush and roll application when used with a Newtonian thickener. It is effective in spray paints used on metal and concrete tile roofs when combined with Borchers® AF 1171 defoamer.

This additive provides good compatibility in systems based on Acrylic, Polyesterpolyurethane, and Urethaneacrylate emulsions.

  • Physical Characteristics

    AppearanceOpalescent, high-viscous liquid
    Non-volatile content28 – 31 % ISO 3251
    (2g, 3h, 105 °C)
    pH4 – 7
    Density1.01 – 1.05 g/cm3 DIN
    53217 (23 °C)
    ViscosityMax. 6000 mPa.s ISO
    3219(A)-1994 (23 °C)

  • Features

    • Develops viscosity stability and improves rheological
      properties mainly in the low shear range
    • Enables application of thick layers on vertical surfaces
    • Effectively prevents sagging
    • Does not yellow or cause chalking in the cured film
    • Free of hazardous air pollutants (HAPs)
    • APEO-free
    • Tin-free

  • Applications

    • Spray Coatings
      • Industrial
      • Architectural
      • Automotive
    • Brush and roll coatings when used with Newtonian thickener

  • Dosage

    • 0.2 – 3.0% on total formulation

    The best incorporation method is to add it after the pigment/filler dispersion but prior to being let down. Under low-shear mixing conditions a pre-dilution in water or a mixture of water/propylene glycol may be necessary for complete incorporation. The exact dosage should be experimentally determined.

  • 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.

  • 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].