INNOVATION | FLAME RETARDANTS
Expanding research The fire protection effect of the new expandable graphite and its processing in various polymers is being investigated in a research project between Luh and the Institute of Polymer Technology at the University Erlangen-Nuremberg in Germany. Combinations with different synergists such as MDH and APP, as well as further optimisation potential of the expandable graphite itself, form part of the project. Preliminary studies have shown that the intumescent layer acts as a heat shield that reduces heat generation and slows fire progress. The Average Rate of Heat Release (AHRE) is significantly improved and combustion is near smoke-free. NeoGraf Solutions has been manufacturing carbon and graphite products for more than 135 years. It specialises in the development and manufacturing of natural and synthetic graphite sheets and powders for numerous applications. It recently added GrafGuard 280-50N to its line-up of expandable graphite flake, non-halogenated flame-retardant additives. The new grade is being targeted at compounds for injection moulded and thermoformed applications.
Above: A flame being put to a PA compound filled with expandable graphite
Above: Expandable graphite before (left) and after expansion (right)
With a particle size of 300 microns, GrafGuard 280-50N has an on-set (or expansion initiation) temperature of 280°C, which NeoGraf says is the highest on the market. “GrafGuard 280-50N offers customers a much wider range of polymer systems such as polypropylene, polystyrene, PET, nylon, and ABS, than our previous products,” says Jeff Gough,
Imerys Graphite & Carbon
The Experts in Electrical and Thermal Conductivity for your Polymers
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TIMREX® C-THERM™ High Aspect Ratio Graphite
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IMAGE: GEORG H LUH
IMAGE: GEORG H LUH
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