materials | Performance PP


the HPF plastics technical study centre show that an unfilled PP has a thermal conductivity of 0.23 W/m.K whereas a Silatherm-filled PP can reach thermal conductivities of up to 1.5 W/m.K. Through the use of a coupling agent, the Silatherm-filled PP can provide very good mechanical properties as well.


Milliken refocuses Meanwhile, six years after its introduction, Milliken has decided to withdraw its Hyperform HPR-803i high performance synthetic mineral-based reinforcing agent from the market. The product – a mineral fibre with an approximate diameter of 0.5 microns and length of 20 microns and a density of 2.3 g/cm3


Figure 3: Graph showing the correlation between MFI and volatiles for Total’s new Lumicene MH140CN0 PP homopolymer against conventional ex-reactor Ziegler-Natta and metallocene PP products (no peroxide) Source: T


otal


filler content of 20% Hybrifil T, a modulus of elasticity on the level of a wollastonite-filled PP, yet with almost isotropic shrinkage, can be achieved with the special silicate,” the company says.


HPF also highlights the use of its Silatherm mineral


filler to increase thermal conductivity in PP. “The use of metallic fibres or powders is widespread where a high degree of thermal conductivity is required in plastic moulding compounds,” it says. “However, it is impor- tant in this case to take into account the disadvantage of the loss of electrical insulation.” Silatherm fillers have been specially developed to


improve thermal conductivity and maintain the electri- cal insulation properties of plastics. Tests performed at


of PP parts with higher stiffness and impact resistance but lower weight than could be achieved with talc. However, despite some interesting development applications, market acceptance has been modest. “While Hyperform HPR-803i provides compounders


with exceptional lightweighting performance we have decided to discontinue sales of this product line due to intense competition from low cost options amidst rising regulatory costs in Europe,” a company representative told Compounding World. “To better serve the automotive, appliance, and


general industrial markets, we are focusing on the introduction of our [other] Hyperform and DeltaMax product technologies, which enable significant improve- ments to stiffness, impact, part weight, and process- ability at very competitive add-on costs relative to existing solutions…We gained significant experience and know-how while selling HPR-803i to compounders and OEMs and have been able to apply those learnings


– allowed production


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