Composite suitable for high-voltage connectors

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Lanxess has developed a halogen-free, flame-retardant and hydrolysis-stabilized polybutylene terephthalate (PBT) compound suitable for high-voltage connectors.

According to Dr Bernhard Helbich, technical marketing manager, the 25% glass fiber reinforced material can be used at temperatures of up to 150°C.

“One strength of the structural material is that its outstanding electrical properties are hardly dependent on temperature and moisture in the typical operating conditions of high-voltage connectors,” he said.

According to Lanxess, Pocan BFN HR’s dielectric strength is over 30 kilovolts per millimeter at temperatures of up to 140 °C (IEC 62431-1), while in a Comparative Tracking Index test (CTI) IEC 60112 test, the material achieved CTI A 600, making it highly tracking-resistant, reducing the risk of short circuits and defects caused by creepage currents and caters to the growing need for miniaturized connectors. Dr Helbich said that it can also be used at voltages higher than 600 V. “The connector design for direct current systems can be optimized for up to 1,500 V in accordance with the design guidelines of the standard IEC 60664 / VDE 0110-1,” he said. The tracking resistance of the compound also hardly diminishes after long-term thermal aging at 120°C or after climate testing, the company said.

In specimen tests based on the SAE/USCAR-2 Rev. 6 long-term hydrolysis tests of the US Society of Automotive Engineers (SAE), it achieved Class 3, and it passed the UL 94 flammability test of the US testing institute Underwriters Laboratories Inc with the classification V-0 with a test specimen thickness of 0.75 millimeters. The structural material also meets requirements set for high-voltage connectors, Lanxess said.

The Pocan BFN HR compound can also be colored in bright colors, such as orange.