MATERIALS | HIGH TEMPERATURE PLASTICS
BASF’s new Ultramid Advanced N2U40G7 is especially suited for connectors that are post-processed with surface mount technology (SMT) and used in consumer electronics
stiffness and strength and are electrically conductive. “The new grades combine these properties with the advantages of Ultramid Advanced N, which makes them unique among carbon-fibre reinforced PPAs already available in the market: high dimen- sional stability due to low water uptake, excellent chemical and hydrolysis resistance, high strength and modulus,” says BASF. The new grades can be used to manufacture automotive structural parts for body, chassis and powertrain, for pumps, fans, gears and compressors in industrial applications as well as for stable and ultra-lightweight components in consumer electronics.
sation with thin-wall structures at high power and data throughput in electronic applications. Due to its low moisture uptake and high heat deflection temperature, the new grade is especially suitable for surface mount technology (SMT) processes, as it prevents blistering or changes in dimensions of the processed part. According to BASF, Ultramid Advanced N2U40G “enhances the robustness, performance and reliability of power and data connectors in consumer electronics such as computers, laptops, servers, smart phones as well as smart household appliances and wearable devices.” “Our new Ultramid Advanced can withstand higher temperatures while maintaining its mechani- cal strength,” says Fang. “It meets the heat distor- tion temperature above 260°C necessary for SMT.” Low moisture uptake not only reduces the risk of blistering, but also guarantees high dimensional stability. In order to provide customers with the best-performing solution for high-precision applications using SMT, BASF has expanded its testing facilities with a simulation oven which imitates SMT processing circumstances. The new high-flow material can be used to manufacture extremely thin-wall connectors, has a UL94 V-0 rating at 0.2mm and satisfies JEDEC Level 1 blistering test standards. Comparative tracking index (CTI) is 600 V. Ultramid Advanced N2U40G7 can be supplied in tailor-made colours. This supports colour correlation for safety reasons or component distinction often required in the E&E industry, BASF says. Colour stability during post-processing with SMT is said to be good when compared to other benchmark materials in E&E applications. BASF has also been expanding its Ultramid Advanced portfolio with carbon-fibre reinforced grades with loadings of 20, 30 and 40%. It says they make for extremely lightweight parts, can safely replace aluminium and magnesium without loss in
14 INJECTION WORLD | September 2021
Mechanical performance can be tuned by the choice and the content of the carbon fibre as well as by the additive technology. Ultramid Advanced N3HC8 with 40% carbon fibre filling shows a better strength and modulus at 80°C (conditioned) than magnesium or aluminium. “Our new PPA com- pounds with carbon fibres are the ideal metal replacement,” says Michael Pilarski from PPA business management at BASF. “And this not only from a material property point of view. Lately, we have seen safety issues at magnesium producers in different countries, which makes the supply rather unpredictable.” PPA grades reinforced with 20 wt.% carbon
fibres are about 20% lighter than PA6 or PA66 filled with 50% glass fibres. The tensile strength of a 20% carbon fibre reinforced Ultramid Advanced compound is either better or equivalent to a glass fibre reinforced PA filled with 50% while showing better processability, BASF says. Ultramid Ad- vanced N3HC8, for example, is very stable after ageing at high temperatures: it retains nearly 100% of its tensile modulus after heat aging at 120°C for 5,000 hours or at 150°C for 3,000 hours. Until BASF introduced Ultramid Advanced N at
K2016, Kuraray was alone in supplying PA9T, with its Genestar family. It highlights Genestar GP2300S, a halogen-free flame retardant compound. This “electro-friendly” 30% glass fibre reinforced grade achieves a UL94 V-0 rating at thicknesses upwards of 0.15 mm through to 3.0 mm, making it suitable for SMT reflow connectors, including high-voltage
Chemical structure of PA9T Source: Kuraray
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IMAGE: BASF
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