HMPP Fiber

Innegrity (Greer, S.C.) has developed INNEGRA, a very high-modulus polypropylene (HMPP) fiber that offers specific tensile strength and modulus similar to fiberglass but at a much lower density (0.9 g/cm3). The fiber reportedly has twice the toughness of aramid fiber, with a dielectric constant one-third that of glass

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Innegrity (Greer, S.C.) has developed INNEGRA, a very high-modulus polypropylene (HMPP) fiber that offers specific tensile strength and modulus similar to fiberglass but at a much lower density (0.9 g/cm3). The fiber reportedly has twice the toughness of aramid fiber, with a dielectric constant one-third that of glass fiber at a cost greater than fiberglass but less than Kevlar and carbon. Because of the density difference, ultimate properties are achieved in hybrid composites, using INNEGRA in conjunction with glass, Kevlar or carbon: A composite featuring 50/50 glass/PP hybrid (by volume) weighs 30 percent less than a composite reinforced with glass alone, and has similar physical properties. Two fiber types are under development: INNEGRA S, optimized for strength, and INNEGRA E, optimized for low-dielectric properties, which are valuable in high-frequency circuit board substrates.