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DOWSIL™ 8603 Additive

A silicone foam control agent for waterborne coatings. It shows excellent defoaming performance in waterborne coatings and ink systems and has a low tendency to cause surface defects.


  • Good antifoaming performance at low dosage
  • APEO-free
  • Low-VOC
  • Easily dispersible compounds and emulsions 


These values are typical properties and are not intended for use in preparing specifications.

  • Active Content Yes No 100 %
  • Specific Gravity @ 25C Yes No 0.99 to 1.03
  • Viscosity at 25ºC Yes No 900 to 3600 Centistokes

Introducing a new family of silicone antifoams for waterborne inks, OPVs and paints with low to medium pigment volume concentrations

  • DOWSIL™ 8590 Additive
  • DOWSIL™ 8603 Additive
  • DOWSIL™ 8610 Additive
  • DOWSIL™ 8628 Additive

Achieve efficient foam control with low levels of defects

With new low-VOC binders, the reduction of co-solvent in formulations, and demands for increased speed in paint production and application, foam control is an ongoing challenge for today's waterborne paint and ink formulators.

Defoaming may be easy to achieve in some cases. But incompatibility between the defoamer and the formulation often leads to film defects.

Dow has applied its deep knowledge of silicone chemistry and extensive antifoam know-how to produce a range of waterborne defoamers that couple high levels of foam control efficiency with low levels of film defects.

Solutions for your waterborne foam-control challenges

For versatility – DOWSIL™ 69 Additive (an emulsion) and DOWSIL™ 8590 Additive (a self-dispersible compound) are the mainstays of our new range of waterborne antifoams and defoamers. These versatile silicone additives are designed for use in inks, overprint varnishes and all types of premium industrial and architectural paints with low to medium pigment volume concentrations.

For more challenging foam problems – DOWSIL™ 8603 Additive may be recommended. It is a 100% active silicone antifoam compound with silica that can be used in various waterborne coatings and ink systems. The recommended addition level of DOWSIL™ 8603 Additive is 0.05 to 1% as supplied, based on total formulation. DOWSIL™ 8603 Additive can be added directly or pre-diluted with alcohols or polyglycols.

Figure 1: DOWSIL™ 8603 Additive at 0.2 weight percent in a waterborne acrylic polyester coating. Microbubbles on the coating surface are eliminated with DOWSIL™ 8603 Additive after applied with medium-hair roller.

Graph: Surface bubble elimination

Figure 2: DOWSIL™ 8603 Additive in the same waterborne acrylic polyester coating. Density reported after shearing at 5000 rpm for 3 minutes using dissolver blade.

Graph: Density after mixing

For systems with co-solvent – DOWSIL™ 8610 Additive offers a high level of compatibility.

For low-temperature applications – DOWSIL™ 8590 Additive and DOWSIL™ 8610 Additive provide effective foam control at low temperatures.

For excellent defoaming and compatibility – DOWSIL™ 8628 Additive possesses a novel technology that, in select binder systems, enables formulators to achieve excellent defoaming performance coupled with excellent compatibility.

For APEO-free formulating – All of the products in this range are formulated without APEO.

For indirect food contact – DOWSIL™ 8590 Additive and DOWSIL™ 8603 Additive are good choices. To obtain food contact regulatory status information, including FDA, EU, Swiss Ordinance and German BfR clearance, visit our EH&S Information Portal or contact our EH&S team.

No Safety Data Sheets are available online for this material
Please Contact Dow for additional information.

No sales specification could be found for this material in selected language

DOWSIL™ 8603 Additive
No Technical Data Sheets are available for this product
Please Contact Dow for additional information.


DOWSIL™ 8603 Additive

No Regulatory Data Sheets are available for this product

DOWSIL™ 8603 Additive
Please Contact Dow for distribution options available for this product.