Surlyn resin is an ethylene-methacrylic acid-based ionic polymer polymerized using a unique production process.

Surlyn is frequently used as a tie-layer and as an adhesive resin which provides excellent adhesion to aluminum and other polar substrates as well as outstanding sealing properties. Important food packaging applications include thermoformed pouches, flexible lidding, vacuum skin packages and form-fill-seal pouches. Other important applications outside food packaging include surface films for golf balls, sports equipment, skin and stretch films, and overmolded (cosmetic) bottles.