Mineral fiber fillers for PP parts

Milliken’s new Hyperform HPR-803 reinforcing additive provides a new option for molders of polypropylene (PP) parts in the automotive sector.

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Milliken’s (Spartanburg, S.C.) new Hyperform HPR-803 reinforcing additive provides a new option for molders of polypropylene (PP) parts in the automotive sector. The filler’s fibers reportedly have a high aspect ratio (~40:1), enabling the production of PP compounds that have mechanicals similar to or better than mineral-filled compounds at a lower weight. Added in quantities of about one-third that required for talc, the filler can save up to 15 percent on part weight. In a recent trial, the filler also enabled part molding with a shorter cooling time and hence lowered the overall cycle time. Whiter than talc, the filler makes compounds easier to pigment. Further, parts made with the additive reportedly exhibit a better surface finish and greater weather resistance than comparable glass-fiber-reinforced PP. Early data indicate that equipment wear is reduced at all processing stages and the filler saves energy, as compared to talc and glass fiber alternatives. Available as a free-flowing powder, the additive can be incorporated during compounding via a side feeder.