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ENGINEERING THERMOPLASTICS | MATERIALS


still go through one or two more innovation cycles in this hybrid period,” says d’Hooghe. At the same time, the use of “e-friendly” organic


heat stabilisers is also growing. “In the past, we have been innovating heat ageing with inorganic systems to get improved performance, but electrical and electronic components in safety-critical systems cannot tolerate failures caused by corrosion [which may arise with inorganic systems],” d’Hooghe says. For such applications, DSM has ForTii products based on PA4T polyph- thalamide. These include ForTii T11, a halogen-free UL94 V-0 grade based on a product originally developed for consum- er electronics, but which meets more stringent durability requirements of automotive OEMs who require greater resistance over longer lifetimes to such things as vibration and thermal shock testing. It is intended for products like antennas, lead frames, high voltage connectors and the like.


The ForTii Ace family of grades with higher Tgs


(thanks to their higher aromatic content) has also been enlarged, with one grade, JTX8, for higher electrical requirements. It has a CTI of 600V and can be produced in all colours, light and dark, which is important for parts meeting FAKRA standards where colours like orange, pink, yellow and even white are needed.


D’Hooghe says most high temperature materials can only be supplied in darker colours. This product also has very good chemical resistance.


Getting into hot water Grivory HT “High Hydrolysis Resistance” is the latest supplement to


the Grivory HT assortment from Ems-Grivory. This new product line offers highest hydrolysis resist- ance at elevated temperatures. The Grivory HT1VA grade for example, has 30% higher retained strength values after 12,000 hours in water at 95°C than a traditional polyphthalamide (PPA).


Left: Mann+ Hummel manufactures a cooling water valve for


Hyundai made of Grivory HT1VA-35 HYS





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