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NEW ENGINEERING POLYMERS AND A MAJOR MILESTONE FOR DUPONT DELRIN
New thermoplastics for the automotive industry … DuPont Thermx TE4001 is a new, glass fibre- and glass flake-reinforced grade from the DuPont family of PCT high-performance polyesters. It is particularly well-suited for adoption in high-voltage electronic components for the automotive industry, which are commonly exposed to high temperatures. Key properties are the material’s excellent dielectric strength of 41 to 42 kV/mm, high stiffness, strength and toughness, resistance to rapid temperature changes and ease of processing to form thin-walled parts whilst exhibiting high melt stability. First applications include the coil bobbins and housings of pencil coil ignition systems, which are small in scale but can withstand operating temperatures of up to 170 ºC. Three new grades of Delrin meet the demands of the automotive industry for particularly low-volatile release, particularly for parts installed in vehicle interiors and doors. Delrin 100PE combines high viscosity with high stiffness, toughness and creep resistance. Delrin 500PE is a medium viscous, general purpose grade, whilst Delrin 527 UVE is also a medium viscous grade with increased weathering resistance. The volatile emissions of all three grades are approximately 90 percent lower than those of standard Delrin grades. …for electrics and electronics … DuPont Zenite 7244 and 7140X are two new, particularly high flow LCP grades from DuPont, suited for the manufacture of components used in the assembly of printed circuit boards. Providing exceptionally low warpage, Zenite 7244 is especially suited for complex, thin-walled components. With a heat deflection temperature of 300 ºC, Zenite 7140X is well suited for board-assembly processes with lead-free soldering. Further benefit is to be gained from the material’s good knit-line strength. With a heat deflection temperature of 356 ºC, one of the highest of all LCPs, Zenite 9140HT can withstand even the elevated temperatures associated with gold eutectic solder assembly, yet recommended moulding temperatures are moderate, only 10 to 15ºC above standard LCPs. New Zenite ZE55801 is internally pre-catalyzed, which saves steps in the plating process. Its generally good plating performance also makes for high productivity. It is well-suited for moulded interconnects requiring plated-on circuitry and for connectors or other components plated for shielding purposes. Flame-retardancy without halogen is the key offering of new DuPont Zytel HTNFR52G30NH. It has outstanding high-temperature capabilities, excellent tracking resistance (>600V CTI) and a V-0 UL94 flammability classification. … and other applications. Delrin 327UV has been developed to provide a combination of enhanced weathering and moulding productivity. Providing uniform shrinkage, the material is well suited to the production of low warpage components with excellent surface characteristics after interior UV exposure. Providing lower wear and friction than standard grades are DuPont Delrin 100TL, with its outstanding impact strength and elongation, and Delrin 500MP acetal for parts requiring low squeak. Zytel HTN53G50LRHF is a new high-performance polyamide polymer reinforced with 50 percent glass fibres. It combines high stiffness and strength with a 20 percent higher flow rate than comparable grades. This new grade increases opportunities for complex, thin-wall part designs whilst improving moulding productivity. Williams is confident of what the future will bring: “Delrin is 50 years young, and is commencing on what is sure to be an exciting second half-century. New Delrin grades are at varying stages of development aimed at improving performance and enable customers to expand the application base still further
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