🧩 PA9T – High-Temperature Aromatic Polyamide
(High-performance aromatic polyamide designed for extreme thermal stability, high chemical resistance, and mechanical strength at elevated temperatures. Part of the “Super-Nylon” category alongside PPA, used in engine proximity parts, EGR, and cooling systems.)
🔹 What is PA9T
PA9T (Polyamide 9T) is a semi-crystalline polymer with an aromatic structure (benzene ring) that grants it exceptional thermal stability and very low water absorption compared to PA6 and PA66. It is capable of constant operation at temperatures up to 150–180 °C, maintaining its rigidity and mechanical properties.
🔧 Composition
| Component | Typical Ratio | Role |
| Aromatic PA 9T | 90–95 % | Polymer base, thermal stability |
| Glass Fiber (GF) | 15–50 % | Increases mechanical/dimensional strength |
| Additives | < 5 % | Protection against oxidation and aging |
🚗 Where PA9T is used in the automotive industry
| Component | Example parts | Observations |
| Electrical Housings | ECU, engine sensors, injector plugs | Constant 150 °C temperature |
| Cooling / Fuel Systems | Fittings, clips, liquid connectors | Excellent resistance to glycols/fuel |
| Brake / ABS Elements | Valves, sensors, covers | Very high thermal and chemical stability |
| Engine / EGR Parts | Covers and mounts near the engine | High-temp rigidity, self-extinguishing |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 280 – 320 °C | Recommended for local repairs |
| Heat Plate (Mirror) | 300 – 320 °C | Ensures complete, solid bonding |
| Ultrasonic / Vibration | — | High precision, no deformation |
🔩 Material Compatibility
- ✅ Compatible: PA9T+GF, PA6T, PA10T, PPA (Polyphthalamide).
- ⚠️ Partially Compatible: PA66-GF, PA6-GF (requires controlled temperature).
- ❌ Incompatible: PP, PE, ABS, PC (thermally and chemically incompatible).
💡 ReplastMD Recommendation: Use PA9T-GF30 or PPA HTN rods. Maintain uniform airflow and avoid overheating above 330 °C, which causes browning and a strong odor.
🧠 How to Identify PA9T
- Engraved marking: >PA9T<, >PA9T-GF30<, >HTN-9T<, >Amodel-9T<.
- Color: Deep black or dark grey, matte surface.
- Density: ~1.45–1.60 g/cm³ (fiber reinforced).
- ReplastMD practical test: If the part does not visibly absorb water and remains rigid under high heat, it is confirmed PA9T.
🛠️ PA9T Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PA9T welding for sensor housings and EGR components, ensuring a high-performance industrial finish.