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.


low shear rheology control with thickener



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.

  • 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 :
  • Europe : EINECS
  • Switzerland : EINECS
  • USA : TSCA
  • Australia : AICS
  • New Zealand : NZIoC
  • China : IECSC
  • Japan : ENCS/METI
  • Taiwan : NECI