New plastics offer improved EMI properties

January 19, 2021 //By Christoph Hammerschmidt
New plastics offer improved EMI properties
Against the background of growing demand in the field of electromobility, the Japanese chemical company Polyplastics Co. is now also offering its resin products for use in electronic systems. With its Duranext PBT and Durafide PPS materials, the company aims to appeal primarily to designers of sensors in radar and camera mounting systems.

Tier-one suppliers and automotive manufacturers are looking for materials with low dielectric constant, stable radio wave transmissibility and low water absorption in radar housings. The market currently uses syndiotactic polystyrene (SPS) and polyetherimide (PEI) for dielectric properties and PPS for low water absorption and chemical resistance. To keep costs manageable, manufacturers have begun to include PBT in their designs.

Polyplastics reports that water absorption has little impact on Durafide PPS 1140A6, but some impact on Duranex PBT 330HR. Polyplastics is therefore working on the development of new PBT grades with improved low dielectric and low water absorption properties.

For the radar mount itself, electromagnetic wave shielding properties are required to protect against unnecessary reflected waves. Polyplastics' electrically conductive grades, Duracon POM CH-10 and EB-10 and Duranex PBT 7300E, are being actively considered, while new PBT grades with stronger electromagnetic wave shielding properties are being developed.

For car-mounted sensor camera mounts, materials with low warpage and high strength such as Duranex PBT 733LD and 7407 are generally preferred. The company has also developed a matt technology that uses laser treatment to reduce noise (stray light). The laser treatment results in favourable gloss and blackening values.

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