What is Dyne Testing?

Q: What is the typical dyne level range used in testing?
A: Dyne testing usually covers a surface energy range from 30 to 72 dynes/cm. For most industrial applications, a surface energy above 38 dynes/cm is considered acceptable for proper adhesion. Still, some surfaces may need to exceed 50+ dynes/cm depending on the coating or adhesive being applied.
Q: How do I know which dyne level to start with?
A: If you’re unsure, start with a mid-range value, like 38 or 40 dynes/cm. If the ink spreads evenly and stays put, try a higher level. If it beads up quickly, go lower. The goal is to find the highest dyne level that still wets the surface for at least 2 seconds; that’s your surface energy.
Q: Can I reuse Dyne pens or swabs for multiple parts?
A: No, it’s not recommended. Dyne pens and test inks can become contaminated or lose accuracy once exposed to air or other surfaces. For reliable results, use fresh applicators and avoid touching the tip to other materials that could interfere with the reading.
Q: Why is surface energy important in cleaning and coating processes?
A: Surface energy determines how well liquids like paints, adhesives, or coatings can wet out and stick to the surface. If the energy is too low, you’ll get poor coverage, peeling, or weak bonds. Dyne testing is a fast and easy way to ensure your surface is ready before moving on.