MATERIALS | HIGH TEMPERATURE PLASTICS
centre in Japan have proven that this grade can reach a CTI up to 1,000V. “The standard set-up (IEC 60112) can cause the creation of an air arc that inhibits the CTI measurement at voltages higher than 600V,” he says. “Therefore, the electrodes were rotated through 180 degrees to prevent this air arc from being formed and to allow voltages up to 1,000V to be applied.” Different colouring options are available for Genestar GP2300S. As a first option, Kuraray has developed a UL-registered V-0 masterbatch together with what was Clariant Masterbatches, now Avient. This masterbatch is available for sampling in various colours, including RAL2003 orange for high-voltage applications. Kuraray has also developed an in-house coloured compound, available for sampling. “This combination of CTI up to 1,000V and colour availability makes Genestar GP2300S the ideal solution for high voltage connector applica- tions,” says Hulpiau. “It solves problems like electrical breakdown due to tracking to prevent safety issues and will help to downsize parts by lowering the creepage distance, for low and high voltage connectors.”
Independent compound producer Akro-Plastic has developed compounds of its own based on PA9T (it does not say which polymer supplier it uses). These are halogen-free, flame retardant Akromid grades, with various levels of glass fibre reinforcement and UL94 V-0 from 0.4mm and GWIT of 800°C from 0.4mm up to 3.2mm. The range includes a special grade in RAL 2003 orange. The colour shows no drift even after 3,000 hours at 120°C. “More important for the moulding process, the grade is not only showing a very easy flowabil- ity, it provides the processor a very wide process window with stable colours and good surface finish,” says Tilo Stier, Global Sales Director & Innovation Manager. For sensors such as Denox sensors used in automobile exhaust systems, which require housings with high dimensional stability and chemical resistance, the compounder developed Akromid T9 GF 40 LT black (7827). This grade has a very wide process window and, unlike PA6T, almost
Adapted test set-up for CTI measurement above 600V Source: Kuraray
no deposit while moulding, Stier says. “Processors can run this laser-transparent black grade with higher output and better quality,” he claims. “It ena- bles complex welding geometries with very low scrap rates in the joining process.” Akro has built up extensive know-how in laser welding, Stier says, and its grades enable very high weld line forces between the laser transparent and laser absorbing components. PA9T has traditionally been quite an expensive polymer (over €10/kg), but this is changing as availability of the polymer from more than one source increases, notes Stier (BASF, for example, introduced its version, Ultramid Advanced N, at K2016).
Options in PA4T The LehVoss Group recently introduced the Luvocom 25 line, based on DSM’s ForTii Ace PA4T-based polymer. “Luvocom 25 offers high glass transition temperatures up to 160°C, extreme stiffness and strength, low water uptake, excellent chemical resistance to moisture, salt, oils, acids and others,” says the company. “Furthermore, it offers retention of performance in under-the-hood applications. The LehVoss Group offers compounds, including customised solutions, for demanding metal replace-
Results of heat aging different polyamides at 120°C. Left: Polyamide 66, Akromid A3 GF 30 FR orange (7871); bottom 0h, middle 1,500h, top, 3,000h, right: Polyamide 9T, Akromid T9 GF 30 FR orange (8104) (120°C)
66 COMPOUNDING WORLD | October 2020
ment applications. To achieve outstanding proper- ties carbon fibres, nano additives and tribological additives are added in the respective compounds.”
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IMAGE: AKRO-PLASTIC
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