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Expandable Graphite for Flame Retardant PA6 Applications.

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This study investigates expandable graphite (EG) as a flame retardant for Polyamide 6 (PA6). EG effectively reduces flammability and smoke production, with optimal performance influenced by sample moisture content.

Keywords:
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Fire Safety Engineering

Background:

  • Polyamide 6 (PA6) is a widely used engineering thermoplastic.
  • Enhancing PA6's flame retardancy is crucial for safety in various applications.
  • Expandable graphite (EG) shows promise as an eco-friendly flame retardant additive.

Purpose of the Study:

  • To evaluate a new type of expandable graphite (EG) as a flame retardant for Polyamide 6 (PA6).
  • To characterize the fire behavior, electrical, thermal, and rheological properties of PA6/EG composites.
  • To investigate the influence of sample conditioning (dry vs. humid) on fire performance.

Main Methods:

  • Cone calorimeter tests at various heat fluxes (35, 50, 65 kW/m²).
  • Limiting Oxygen Index (LOI) and UL-94 vertical burning tests.
  • Electrical conductivity, thermal conductivity, and rheological property measurements.
  • Analysis of dry and humid conditioned samples.

Main Results:

  • A minimum EG loading of 15 wt.% (8.6 vol.%) was required for significant fire inhibition.
  • UL-94 V0 classification achieved at >20 wt.% (humid) and >25 wt.% (dry) EG.
  • LOI values reached up to 39%, indicating good flammability inhibition.
  • Humid samples showed reduced Total Heat Evolved (THE) by 16% and Total Smoke Production (TSP) by 22%.

Conclusions:

  • Expandable graphite is an effective flame retardant for PA6.
  • Sample moisture content significantly impacts fire performance, with humid conditions generally enhancing flame retardancy.
  • EG addition also modifies electrical, thermal, and rheological properties, requiring further investigation for specific applications.