In-depth engineering evaluation of synthetic polymers in safety net cordage: Polypropylene multifilament (PPMF), HDPE monofilament, Polyamide 6/6.6 nylon, and bi-component polyolefins.
| Parameter | Polypropylene (PP) | High-Density PE (HDPE) | Polyamide (Nylon) | Mixed Polyolefins |
|---|---|---|---|---|
| Specific Gravity | 0.91 g/cm³ | 0.95–0.96 g/cm³ | 1.14 g/cm³ | 0.92–0.94 g/cm³ |
| Tensile Tenacity | 6.0–7.5 cN/dtex | 5.5–7.0 cN/dtex | 7.5–9.0 cN/dtex | 6.5–8.0 cN/dtex |
| Elongation at Break | 15%–25% | 12%–20% | 20%–30% | 15%–22% |
| Moisture Regain | < 0.1% (Hydrophobic) | < 0.01% | 4.0%–4.5% (Hygroscopic) | < 0.05% |
| UV Stabilization | 300 kly (3–5 yrs) | 600 kly (6–9 yrs) | 350 kly (3–5 yrs) | 500 kly (5–7 yrs) |
| Melting Point | ~165°C | ~130–135°C | 220°C / 260°C | ~150–160°C |
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