Waterborne coating systems

The criteria determining the durability of a coating system are: elasticity, water vapor permeability, stability of gloss, tensile strength and water tightness.

Your advantage lies in the uncompromising standards of the Sikkens water-based products. The diagrams below show the technical characteristics of waterborne paints compared to solvent-based coating systems.

Elasticity

Changes in temperature cause expansions or contractions in the wood.  In addition, as wood absorbs or gives off moisture swelling or shrinking can result. A coating should be elastic in order to withstand these continual movements.
The diagrams shows that the elasticity of solvent-based systems decreases remarkably faster than in the case of waterborne coating systems.

Water vapour permeability

Another important property of wooden windows is its tendency to transport water vapor. Optimally, the coating should likewise possess excellent permeability for water vapor.
As the diagrams demonstrates, the water vapor permeability of waterborne coatings is approximately 5 times higher than that of solvent-based coatings.

Stability of gloss

Another important consideration for the longevity of the coating is its ability to maintain the original sheen.  Indicators for resistance to sheen loss or change are resistance to degradation and brittleness. The graph on the right shows the superior durability and stability of waterborne coatings compared to solvent-based systems even after a short period of weathering.

Adhesion properties

Tensile strength is a crucial determinant of coating system durability. This is tested on a coated wooden cross-section, which is between two opposite moisture environments.
As is shown in the diagram, the tensile strength of waterborne coatings is higher with increasing moisture content, and therefore superior to solvent-based coatings.

Water tightness

A coating must offer protection against water infiltration.
As the diagram illustrates, the water tightness of waterborne coatings is almost twice as high as for solvent-based coatings.