🧩 PA46 – Polyamide 4/6
(High-performance polyamide with exceptional resistance to temperature, abrasion, and friction. Used in precision automotive parts near the engine. It is more rigid and thermally stable than PA66, designed for extreme technical applications.)
🔹 What is PA46
PA46 (Polyamide 4/6) is a semi-crystalline polyamide obtained from tetramethylenediamine and adipic acid. It has a high crystallinity (~70%), which gives it very high hardness, excellent dimensional stability, and resistance to temperatures up to 160 °C in continuous operation. It is frequently used for gears, covers, supports, and friction parts in the engine compartment.
🔧 Composition
- Polyamide 46 (PA46): 100%
- Optional Additives: glass fibers, lubricants, thermal stabilizers.
- Density: 1.14–1.20 g/cm³.
- Melting Point: ≈ 295–300 °C.
- Chemical Resistance: Excellent (oils, fuels, antifreeze).
- Continuous Heat Resistance: up to 150–160 °C.
🚗 Where PA46 is used in the automotive industry
| Component | Example parts | Observations |
| Engine / Technical | Covers, gears, spacers | Exceptional heat and friction resistance |
| Electrical Systems | Connector housings, engine clips | High dimensional stability |
| Transmission / Brake | Mechanical parts, supports | High hardness, stable thermal behavior |
| Structural Elements | Clips, housings, plates | Rigidity and vibration resistance |
🔧 Welding Temperature and Methods
| Method | Optimal Temperature | Observations |
| Hot Air | 290 – 310 °C | Rapid melting, requires precise control |
| Heat Plate (Mirror) | 280 – 300 °C | Strong joint without voids |
| Manual Extrusion | 280 – 300 °C | Suitable for long cracks and large thicknesses |
🔩 What to Weld PA46 With (Material Compatibility)
PA46 welds effectively only with technical materials from the same family or those with similar melting points.
✅ Compatible with:
- PA46 ↔ PA46 / PA66 / PA6 / PA610 / PA612 / PA+GF – good bond.
- PA46 ↔ PC+PA – good compatibility.
- PA46 ↔ PBT / PET – limited compatibility (use with caution).
❌ Incompatible with:
- PP, PE, PVC, PS, ABS, ASA, PMMA – melting points are too low.
💡 ReplastMD Recommendation:
Use PA46 rods or reinforced PA66 rods at 290–300 °C. Heat the area uniformly to avoid cracks during cooling. Allow for slow cooling — PA46 has high shrinkage upon solidification.
🏭 Manufacturers and Trade Names
- DSM: Stanyl® PA46
- DuPont: Zytel® HTN
- BASF: Ultramid® A46
- Evonik: Vestamid® X46
🧠 How to Identify PA46
- Engraved marking: >PA46<, >Stanyl<, >Zytel HTN<.
- Rigid, dense, semi-matte surface.
- Nylon smell when melting.
- Blue flame, low smoke.
- Softens only above 270 °C.
- ReplastMD practical test: If the part is very rigid, resists hot air up to 270 °C without deformation, and is marked >PA46< – it is confirmed Polyamide 4/6.
🛠️ PA46 Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PA46 welding for engine covers, gears, and heat-resistant connectors, ensuring a high-durability finish.