HFFR Cable Compounds: Flame Retardant System Design
·8 min read·
flame retardantsHFFRATHMDH
HFFR Cable Compounds: Flame Retardant System Design
Halogen-free flame retardant (HFFR) cables are mandated in building wiring, rail, and marine applications under IEC 60332, EN 50267, and IEC 61034 standards.
Primary FR Systems
ATH (Aluminium Trihydrate): Endothermic decomposition releases water at 180–220°C, cooling the flame zone. Load levels of 50–65% by weight. Limits processing temperature to <200°C.
MDH (Magnesium Dihydroxide): Releases water at 330–360°C, enabling use in PP and polyamide compounds. Higher cost than ATH; surface treatment critical for polyolefins.
Synergists
- Red phosphorus: 5–8% addition reduces ATH/MDH requirement by 15–20%, improving mechanical properties.
- Zinc borate: 3–5% reduces smoke generation and promotes char formation.
Performance Targets
| Property | Target | Standard |
|---|---|---|
| LOI | ≥30% | ISO 4589 |
| Smoke density | ≤30% Ds | IEC 61034 |
| HCl emission | <0.5% | EN 50267-2-1 |
| Tensile strength | ≥10 MPa | IEC 60811 |
Contact HMEChem for flame retardant packages optimized for XLPE and EVA cable compounds.
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