PPA (Polyphthalamide)
Polyphthalamide — semi-aromatic high-performance polyamide. 55%+ aromatic diacid (TPA/IPA) gives Tg ~125°C and Tm >310°C — far above PA66 (Tg 50°C, Tm 260°C). Much lower moisture absorption than aliphatic PAs. SMT-reflow compatible (260°C+). Trade names: Amodel (Solvay/Syensqo), Zytel HTN (Celanese), Ultramid T (BASF), Grivory HT (EMS). Used for automotive powertrain (thermostat housings, charge air coolers), SMT connectors, LED headlamp housings, and metal-replacement applications to 280°C.
Chemical composition comparison (wt%)
Side-by-side: PPA (Polyphthalamide) (COMPOSITION) (ISO 16396) vs ASTM
| Element | PPA (Polyphthalamide) (COMPOSITION) | ASTM | Overlap |
|---|---|---|---|
| Base Polymer (Semi-Aromatic Polyphthalamide) | 99–99.9% | — | — |
Mechanical properties
Unfilled Dry
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 80–95 | MPa |
| Elongation | 10–30 | % |
| Elastic Modulus | 2400–3000 | MPa |
| Density | 1.17–1.2 | g/cm3 |
| Melting Point | 305–320 | °C |
Gf33 Dry
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 195–230 | MPa |
| Elastic Modulus | 12000–15000 | MPa |
| hdt_1.8mpa | 280–300 | °C |
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