Budenheim’s new PIN FR system for glass-fibre reinforced polyamides offers no migration and low corrosion. The HFFR (halogen-free flame retardant) package is based on melamine polyphosphate, acting in the solid phase (charring) with a polymeric synergist (phosphorus acting in the gas phase). The HFFR system is heat stable up to 340°C, facilitating processing. The benign interaction of the synergist and melamine polyphosphate ensure low corrosion while processing. Fire performance UL 94 V-0 at 0.8 mm and GWIT (glow wire ignition temperature) above 800°C are achieved in glass-fibre reinforced PA66 at 21% loading. Weathering tests show very low migration due to the polymeric structure. A low smoke toxicity and smoke density profile allows the use in railway and other transportation applications. The HFFR is suitable for glass fibre reinforced polyamides (PA 66, PA 6), especially for E&E applications (switches, connectors, circuit breaker and housing).
Compounding World, December 2020 http://download.polympart.ir/polympart/EMag/CW-Dec-2020.pdf
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