Dyne levels are measurements of the surface energy of plastics and nonporous substrates. An ink's wetting tension is often referred to as wettability. If the substrate's dyne level is too low, the ink will bead and not lay in a smooth, even film and adhesion problems will be common. Generally speaking, the ink's wetting tension should be about 10 dyne levels below the substrate's dyne level. For conventional sheetfed inks, the dyne level of the substrate should be between 40 and 50 dyne. UV inks may require a higher dyne level, 50 dyne or above. Dyne levels can be checked with dyne solutions using felt tipped pens and solutions in bottles. While dyne levels of nonporous substrates can be increased with corona and chemical treatments, these treatments will lose effectiveness over time. Check with your ink manufacturer for their recommendations for the specific type of plastic.