How VA Content Shapes EVA Flexibility and Adhesion

Vinyl acetate (VA) is the comonomer that turns polyethylene into a flexible, tacky ethylene-vinyl acetate copolymer. The VA level is the single biggest lever on how the resin behaves.

VA and Flexibility

VA side groups disrupt the crystallinity of the polyethylene backbone. As VA rises, the polymer becomes softer, more flexible and more transparent, and its melting point drops. Low-VA grades stay stiffer and more crystalline.

VA and Adhesion

Higher VA increases polarity, which improves wetting of polar substrates such as metal, paper and polar films, and boosts compatibility with polar tackifiers and plasticizers. That is why high-VA grades are favored for solvent adhesives and inks.

Reading the Evatane Range

• VA 18% — stiff and high-flow, for fast coating and modification.
• VA 28% — balanced flexibility and processability for film and general hot melt.
• VA 33-40% — soft, polar and highly soluble for cable, ink and foam.