The latest nucleator for polypropylene from Milliken Chemical, Spartanburg, S.C., is Hyperform HPN-600ei. Similar in chemistry to Hyperform HPN-20E for injection molding, it’s aimed specifically at sheet extrusion and thermoforming. It reduces haze, boosts Gardner impact and topload compression strength, speeds forming cycles, and reduces ovality warpage, according to Milliken. With these benefits it can make PP more competitive with PET and PS.
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