FLAME RETARDANTS | ADDITIVES G R
sion about applications for thermally and electri- cally conductive plastics, the focus is often not only on conductivity but also on the flame retardancy of these components. “Expandable graphite not only makes the component flame-retardant, but also electrically and thermally conductive. With only one single additive, the requirements of conductivity and flame retardancy can be achieved and per- fectly combined,” says Angelina Schöffel in Technical Customer Support & Marketing at the company.
Mineral solutions Quartzwerke division HPF The Mineral Engineers (HPF) is working on development of kaolin and wollastonite as synergists for phosphorus-based FRs (phosphinates and phosphates) in polyamides. These mineral fillers increase mechanical proper- ties such as tensile elongation and modulus, as well as HDT, while reducing the amount of the principal FR needed. Commercial phosphorus-based FRs currently on the market are added at levels of around 20%, normally in compounds containing 30% glass fibres. But HPF says a mixture of 14% flame retardant and 30% of its synergist will yield
the same flame retardance. Thorsten Hilgers, in product development,
plastics, at HPF, says that glass fibres give better mechanical properties but explains that improvement is not always required. So, if a user does not need high-level mechanicals but does want to cut the total cost of the flame-retardant package, then the use of these mineral fillers could be an answer. “HPF’s intention is not to replace glass in compounds but rather to open up new applications for flame retardant polyamides where they currently may not be used because they are too expensive,” he says. Depending on the exact type of phosphorus- based flame retardant, kaolin may work better as a synergist than wollastonite or vice versa. “We are not sure why. We think the wollastonite could stabilise the crust formation with phosphates,” says Hilgers. Development work continues. The HPF technology also works in PBTs, where it is possible to reduce the level of phosphorus- based FR down to 8%. Applied Minerals, headquartered in Brooklyn,
O E
Above: Georg H Luh says expandable graphite is a proven flame retardant in automotive and construction applications
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