Posted on 09/02/2022 in Electric & Electronic Fire Safety 2021
Thanos Porfyris, National Technical University, Athen

Thanos Porfyris, National Technical University, Athens, presented work underway in the EU-funded EPAnEK project testing non-halogenated flame retardants for polypropylene electrical cable conduits and tubes. These are not today covered by the EU Construction Products Regulation, but the Low Voltage Directive (2014/35) requires self-extinguishing and sets standards for smoke density (EN 61034-2), gas acidity (EN 60754-2) and halogen content (EN 5064-2). There is demand for low smoke FR solutions, so demand for non-halogen. Also, HALS stabilisers are used to limit weathering of polyolefins, but X. released by halogens can be antagonistic to HALS. Initial tests have achieved UL 94 V0 (1.6 mm) with 20% APP plus 2% phosphinate, but with challenges of deteriorated electrical and mechanical properties and increased MFR (melt flow rate), the latter being problematic for production of corrugated tubes. Work is underway to address these challenges with impact modifiers and UV and heat stabilisers.

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