ADDITIVES | POLYAMIDES


of the behenate allows for higher addition levels [without] risking the migration issues associated with high amounts of the lower molecular weight calcium stearate,” says Eriksson.


Above: The need to comply with different flame testing standards is a challenge for PA compound developers


create inhomogeneous premixes.” Baerlocher offers aluminium stearate compacted to a convenient granular format that eliminates these problems. The lubricant can also be com- pacted with other additives into a granule to create a “one-pack” option that reduces handling, minimises dust generation, and increases dosing accuracy, according to Eriksson. Baerlocher also offers a calcium behenate, which contains renewable carabon, as a replacement for more expensive fossil-carbon-based calcium montanate lubricants in PA. “The long carbon chain


Multiple standards Achieving flame retardancy standards is important in many of the applications where PA compounds are used. One of the big flame retardant challenges is to develop systems with the ability to pass flammability tests from both the US (UL 94, for example) and Europe (glow wire), according to industry consultant Roger Avakian. “Many formulations can pass either one or the other, but not both,” he says. Other key properties include ease of processing and avoiding corrosion and mould deposits as well, of course, as sustainability—both in terms of environmental profile and recyclability. The ability to retain flame retardant properties during recy- cling is a cost advantage that is being looked at more often, according to Avakian. “Most studies have been on halogenated FRs, showing they retain FR characteristics during mechanical recycling. Studies of phosphorous-based HFFRs have shown they are also robust, but there is some


YEARS


NC7000


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IMAGE: SHUTTERSTOCK


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