The Dyne pen test is considered the industry standard for assessing the ability of materials to bond to a treated surface. In general, the ability of a material to adhere to a surface is directly related to its surface energy. If the surface energy of the treated surface does not significantly exceed the surface tension of the material applied to the surface, it becomes difficult for the material to bond (or stick) to the surface.
e9 Treatments reduce the surface energy of the treated surface, making it difficult for this bond to occur. For example, the untreated surface free energy of stainless steel is 40-60 Dynes/cm. e9 Metal Treatment reduces the surface free energy to 13.5 Dynes/cm. The following chart shows the surface free energy of some common industrial surfaces, untreated and treated with e9 Metal Treatment.
e9 Metal Treated
|Teflon ® (a known non-stick surface)||18||
For reference only
To demonstrate this, you can use a Dyne pen to mark the treated surface. On a properly treated surface, the liquid from the Dyne pen will bead up within 2-3 seconds and then start to disappear and shown in the photos below. The untreated piece is shown first, the treated piece second.