Explaining Surface Tension

The Science Behind Surface Energy, Surface Tension, and Adhesion

At Lotar LLC, we provide specialized surface energy testing solutions that help manufacturers assess surface cleanliness and adhesion readiness. Every solid material has a specific surface energy (SE), but contamination from oils, dust, lubricants, fingerprints, and other impurities can interfere with bonding performance.

Surface energy is measured in mN/m (dynes/cm) and plays a critical role in manufacturing processes such as printing, painting, coating, and gluing. Closely related to surface energy is surface tension, which describes a liquid's tendency to spread across or bead up on a surface. When a material has sufficiently high surface energy, liquids can wet out and spread evenly, creating stronger adhesion and more consistent results. Low surface energy, on the other hand, can lead to poor wettability, weak bonds, and coating or printing defects.

Using test inks and test pens, manufacturers can evaluate surface energy according to recognized industry standards and determine whether a material is properly prepared for further processing. This testing method involves applying a test liquid with a known surface energy value to a surface and observing its behavior. The results help identify contamination, verify the effectiveness of cleaning or treatment processes, and ensure surfaces are ready for optimal adhesion performance.

Want to improve surface cleanliness, wettability, and adhesion reliability? Contact Lotar today for expert guidance, quality test inks and pens, and a free quote within three days.