AUTOMOTIVE | COMPOUNDS


driver-assist features proliferate, the radome, the dielectric cover that protects the radar antenna, has become a make-or-break component for system performance as incumbent materials were not created for the higher frequencies (37.5 GHz to 79 GHz and above) now standard. Manufacturers reportedly told Avient they are


hitting four recurring barriers: signal loss from elevated dissipation factor values eroding detec- tion range; narrow detection angles limiting coverage; warpage during injection moulding extending qualification timelines; and Blind Spot Information System certification hurdles blocking European market entry. The new grades can deliver a dielectric constant (Dk) of 2.53 to 2.94 and a loss tangent (Df) as low as 0.001 at 2.5 GHz, while in-house RF testing at 37.5 GHz demonstrated clear improvements in gain, elevation angle, and detection angle compared to PBT+GF materials. High-impact and reinforced laser-weldable grades address the outer radome layer’s impact and structural demands, while a dedicated laser-ab- sorbing grade serves as the base layer, enabling fully-welded assemblies compatible with laser assembly processes.


“Tier 1 automotive suppliers in Asia were hitting


real performance ceilings with PBT+GF materials,” said Flight Xu, General Manager, Specialty Engi- neered Materials, Asia, at Avient. “Traditional polyesters could not deliver stable dielectric values at high frequencies, and warpage was creating costly assembly rework. With our new Preperm materials, customers are achieving meaningful gains.” As EV charging speeds continue to increase, thermal management is becoming a critical design consideration. Ultra-fast charging generates


Above: Hybrid composite battery cover developed by Envalior in collaboration with Sabic, Siebenwurst, Ensinger, and Forward


Engineering


salaa@jwell.cn


sales@jwell.cn


IMAGE: ENVALIOR


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