Yann Bourgeois, Huber Martinswerk, presented results of combining zinc melamine polyphosphate (ZMP intumescent) and aluminium tri hydroxide (ATH) for LSZH (low smoke zero halogen) cables (polyethylene – EVA). The zinc in ZMP is known to reduce smoke emission and the melamine phosphate generates a carbonaceous intumescent protective layer. In typical cable formulation, replacing 60% ATH by 50% ATH – 10% ZMP resulted in lower heat release rates and five times reduced smoke emission, or enabled total FR content to be reduced for comparable fire performance.
Yann Bourgeois, Huber Martinswerk
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