Defoamer for coatings

Finding the Optimal defoamer

Foam can be generated during the manufacture, preparation, and application of paints and coatings. Fortunately, foam problems can be avoided or overcome by selecting an optimal defoamer or deaerator. Defoamer performance can be affected by a large number of complicated formulation and application parameters which makes selection of the optimal defoamer difficult and time consuming. Selecting the wrong defoamer will lead to even greater defects, problems, and potentially to coating failure.

Your way to the optimized defoamer

Optimizing coatings in lab

Compatibility Test

Most important for sensitive systems, e.g. low PVC, pure acrylic

  • The paint is applied at a layer thickness of 100 µm with a doctor blade on glass.
  • After drying, the surface is evaluated for irregularities and craters.
  • Additionally the gloss and haze is measured for glossy paints.


Rating according an internal scale:
0 = many craters, very incompatible
5 = no craters, very compatible

Defoamer efficiency test

Efficiency Test

Test to evaluate the best process defoamer.

  • 50 g of the paint are stirred for 1 min at 3000 rpm.
  • 45 g of the foamed sample is poured to a graduated cylinder.
  • The volume is noted.


The lower the volume, the more efficient the defoamer.

Roller test for defoamers

Application Test

Test to check the performance in the end-application.

  • Paint is applied on a Leneta card with an open pored roller
  • after drying the surface is evaluated visually with respect to macro-foam
  • on a light box the micro-foam is evaluated


Rating according an internal scale
0 = A lot of foam
5 = Foam-free

Our defoamer experts are happy to help you find the optimal defoamer. Please click on the contact button on the right for the specific contact details for your region.

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