MATERIALS | FLAME RETARDANTS
Schmitt, Segment Manager for the company’s flame retardant business. “In reinventing their prod- uct, car-makers will need new materials with safety built in to deal with a whole new set of challenges and requirements.” He says the company’s Exolitorganic phosphorus
Above: Flame retardant systems for EV cables and connectors must allow good colour- ability
flame retardant have shown that satisfactory long term heat stability can be obtained with ADK Stab FP-2500S in PP stabilised with the common combi- nation of antioxidants (ADK Stab AO-60 and ADK Stab 2112). The company says the results (Figure 1) also show that with this AO combination, long term thermal stability performance of ADK Stab FP- 2500S is superior to APP and brominated flame retardants (with antimony trioxide). “These studies proved that long term thermal stability of flame retarded GF PP compounds with ADK Stab FP-2500S could be greatly enhanced by changing the primary hindered phenolic anti-oxi- dant to ADK Stab AO-20,” the company says. As EVs become more popular, Adeka says
tracking resistance (typically defined by CTI) may be considered just as important as flame retardan- cy in plastics compounds. It says it is possible to achieve a CTI of 600V in glass fibre reinforced PP compounds containing ADK Stab FP-2500S. This compares with 525V for a compound containing APP, while a compound containing a brominated FR also showed a CTI of 600V.
Reinventing automotive The expectation that the rapid switch to EVs will see considerable growth in the use of flame retardants is also shared at Clariant. “Until recently, the automotive industry was not much of a market for our high-performing flame retardants. However, that is about to change dramatically,” says Elmar
flame retardants have been used for near two decades in some of the most demanding industries, ranging from smart consumer electronics to home appliances.”Exolit is non-halogenated, which makes it safer and more environmentally compatible than most solutions out there. But it is the improved material performance that makes it especially appealing to the EV industry,” Schmitt says. He says that Exolit does not affect, and in some cases even improves the electrical properties (CTI) of plastics. It is also hydrolytically stable, does not compromise mechanical properties, can be laser welded, and is easily coloured. US-based Polymer Additives Group (PAG) says it is bolstering its HFFR (halogen-free flame retardant) line through new product developments and a strategic partnership. The company has extended its Charmax NH family with a new line of intumescents for polyolefins and TPEs. It says they offer improved performance, higher thermal stability and lower water solubility than competing systems. PAG is now also the exclusive US distribu- tor for precipitated magnesium hydroxide products made by Russian company Nikomag. The new grades are significant for PAG as the company has traditionally been a producer for the PVC industry. “These new lines and products are getting us into the ever-growing polyolefin market,” says Josh Elliott, Sales Manager and VP of New Business Development. Germany’s Budenheim highlights the use of its halogen-free additives in bio-composites such as wood-reinforced plastics (WPCs). Budit 620, which is based on coated ammonium polyphosphate, is said to provide effective fire protection in WPCs for indoor applications and especially in public buildings. It also offers very good stability and water resistance, which prevents the composite from swelling in outdoor applications. Composites formulated with Budit 620 can meet fire ratings
Figure 1: Crack observation at 150˚C oven aging of PP compounds containing different flame retardants, including Adeka’s FP-2500S system, in combination with its ADK Stab AO-60, AO-20 and 2112 antioxidants
No flame retardant
Crack generation time/ h Source: Adeka
26 900 COMPOUNDING WORLD | December 2021 Adeka FP-2500S 1400
APP (ammonium polyphostate)
AO-60 / 2112 800 600 Brominated flame retardant Adeka FP-2500S
AO-20 / 2112 3600
www.compoundingworld.com
IMAGE: SHUTTERSTOCK
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