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Airtech

Non-Halogen FR System Has Lower Density and Higher Tracking Index

07 August 2009

A new 25% glass fibre-reinforced polyamide 6 compound has been launched by Chem Polymer, to provide injection moulders with an alternative to halogenated flame retardant (FR) formulations.

Chemlon 225 GVNH has a UL 94 flammability listing of V0 at thicknesses down to 0.8 mm. Chem Polymer say that its comparative tracking index of 600 V is more than double that of a comparable compound with a halogenated (typically brominated) FR formulation, providing electrical performance in automotive, residential, and appliance applications such as housings with snap-fit assembly, circuit breakers, charger covers, and safety switches. The new compound is also 14% less dense, yielding lighter parts.

Although the Chemlon product is currently UL-recognized only in black formulations, its FR formulation is expected to provide a broader range of colourability than brominated FR systems and non-halogenated ones based on red phosphorus, according to Richard Barnes, Technical Manager. Typically these permit only dark colours.

“Because non-halogenated FR systems have been more difficult to incorporate into glass-filled compounds than brominated ones, relatively few non-halogenated polyamides have been available, particularly in North America,” said Barnes. “Our new Chemlon compound will provide a higher-performance alternative for moulders seeking to serve the world market for components requiring flame retardancy.”

Chemlon 225 GVNH is already in commercial use for the housing of an air filter used in a vehicle engine compartment.






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