Elvax 40L-03 Ethylene-vinyl acetate copolymer DuPont Ethylene co-terpolymers - solid (EVA, EMA) >> Ethylene Vinyl Acetate, EVA Soluble in organic solvents Elvax(R) is the DuPont registered trademark for a broad line of ethylene-vinyl acetate copolymer resins for use in adhesives, sealants, and coatings. Elvax(R) blended with a petroleum wax and resin tackifier is the basis of many hot melt adhesives. In addition, Elvax(R) resins impart plastic-like properties that enable wax to compete effectively with high-quality polymeric coatings. In summary, Elvax(R) resins are key ingredients in a variety of hot melt and solvent-applied systems. They are used as: Resin bases for flexible, heat-sealable, hot melt coatings with excellent water vapor and gas barrier properties. High Vinyl Acetate, Low Melt Index Resins. These specialty Elvax(R) resins have high levels of vinyl acetate and a low melt index. For many years DuPont has made specialty grades of Elvax(R) that have the unusual combination of high vinyl acetate levels and low melt indexes. Due to the high VA content, the polymers have low crystallinity and are relatively polar. Combined with a high molecular weight (low MI), the polymers are almost "rubbery" in nature. These polymers can be blended with hydrocarbon waxes to give blends with unusual properties. The blends are mostly wax so they have excellent barrier properties to water as measured by MVTR. They are also relatively high in viscosity, due to the low MI of the polymer, so the blends have good physical properties. The high VA level means that these polymers are also soluble in organic solvents. The low MI gives them good heat resistance and this can be seen in the high Ring and Ball numbers. These polymers also can be used in other end-use markets that need the combination of high vinyl acetate and high molecular weight. One drawback is that the polymers are higher in gel than the standard grades of Elvax(R) so they cannot be used in some film markets. High vinyl acetate, low melt index, relatively polar, ethylene-vinyl acetate copolymer resin. Used as a resin base for flexible, heat-sealable, hot melt coatings. Provides very good water vapor and gas barrier properties. Gives low crystallinity, high viscosity, good heat resistance and high molecular weight.