Dyne level, also known as surface energy, is a measure of the surface tension or adhesive properties of a material. It is typically measured in dynes per centimeter (dyne/cm) or millinewtons per meter (mN/m).
In the context of coatings, dyne level is an important factor in determining the adhesion of a coating to a substrate. If the dyne level of the substrate is lower than that of the coating, the coating may not adhere properly and may peel or flake off over time. In order to ensure good adhesion, it is often necessary to increase the dyne level of the substrate through various surface preparation techniques, such as cleaning, sanding, or using a primer.
Measuring the dyne level of a substrate is typically done using a dyne test, which involves placing a droplet of a standard liquid on the surface and observing whether it spreads out evenly or beads up. The surface tension of the liquid is adjusted until the droplet spreads out completely, and the dyne level is then determined based on the surface tension of the liquid.
It is important to consider the dyne level of the substrate when selecting a coating, as well as to prepare the substrate surface to achieve the desired dyne level. Surface treatment techniques, such as corona treatment, plasma treatment, or flame treatment, can be used to increase the dyne level of the substrate and improve coating adhesion.