🧩 PA+ASA – Polyamide + ASA Blend
(Modern technical blend combining the mechanical and thermal resistance of polyamide (PA6 / PA66) with the UV and weather resistance of ASA. Premium material for exterior automotive parts where durability and color stability are essential.)
🔹 What is PA+ASA
PA+ASA is a polymer alloy (blend) of polyamide and acrylonitrile-styrene-acrylate. This composite offers toughness and chemical resistance, along with UV stability superior to ABS, thanks to the acrylate phase in ASA. The result is a material resistant to heat, oils, solar radiation, and mechanical shocks, primarily used for exterior or technical parts exposed to the environment.
🔧 Composition
- Polyamide (PA6 / PA66): 60–70 %
- ASA: 30–40 %
- Additives: UV/thermal stabilizers, lubricants, dyes.
- Density: 1.10–1.18 g/cm³
- Melting Point: ≈ 240–260 °C
- UV Resistance: Excellent.
- Continuous Heat Resistance: 100–120 °C.
🚗 Where PA+ASA is used in the automotive industry
| Component | Example parts | Observations |
| Exterior | Mirror caps, headlight frames, grilles | UV resistance and color stability |
| Technical Interior | Sensor covers, console frames | Scratch resistance, glossy look |
| Electrical Systems | Housings, connectors | Insulation and high thermal resistance |
| Engine / Technical | Covers and medium supports | Good oil and vibration resistance |
🔧 Welding Temperature and Methods
| Method | Optimal Temperature | Observations |
| Hot Air | 250 – 270 °C | Clean melting, constant airflow |
| Heat Plate (Mirror) | 240 – 260 °C | Solid and aesthetic joint |
| Manual Extrusion | 240 – 260 °C | Ideal for thick or visible areas |
🔩 What to Weld PA+ASA With (Material Compatibility)
Compatibility is excellent with blends from the polyamide and styrenic families.
✅ Compatible with:
- PA+ASA ↔ PA6 / PA66 / PA+ABS / ABS+ASA / PC+PA – excellent.
- PA+ASA ↔ ASA / ABS / SAN / Bayblend® / Cycoloy® – good bond.
❌ Incompatible with:
- PP, PE, PVC, PBT, PET, pure PMMA – different melting points.
💡 ReplastMD Recommendation:
Use PA+ASA or ABS+ASA rods at 255–265 °C. Heat the area uniformly — ASA can discolor if overheated. For visible parts, gloss can be restored with a quick hot air pass or fine polish.
🏭 Manufacturers and Trade Names
- BASF: Ultramid® ASA Blend
- Covestro: Bayblend® ASA/PA
- SABIC: Cycoloy® ASA/PA
- LG Chem: LUPOY® PA+ASA
🧠 How to Identify PA+ASA
- Engraved marking: >PA+ASA<, >PA/ASA<, >Bayblend<, >Cycoloy<.
- Semi-glossy or matte surface, fine texture.
- Uniform color, no yellowing in the sun.
- Yellow-blue flame, faint styrene odor.
- Softens at ≈ 250 °C.
- ReplastMD practical test: If the part has a scratch-resistant surface, stable gloss, and is marked >PA+ASA<, it is a confirmed Polyamide + ASA blend.
🛠️ PA+ASA Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PA+ASA welding for exterior grilles and mirror caps, ensuring a clean, uniform, and UV-resistant finish.