🧩 POM+PA – Polyoxymethylene + Polyamide
(A technical blend between POM (acetal) and PA (polyamide), designed to combine the dimensional precision and low friction of POM with the mechanical strength, elasticity, and thermal stability of polyamide. The resulting material is rigid, durable, and resistant to oils and vibrations.)
🔹 What is POM+PA
POM+PA is a compatibilized alloy of two materials with complementary properties. POM provides hardness and a low friction coefficient, while PA (Nylon) adds impact resistance and heat stability. It is a self-lubricating material, thermally stable up to 130 °C, making it perfect for gears, guides, and structural components that require both precision and toughness.
🔧 Composition & Properties
- Base: 50–70% POM, 30–50% PA6/PA66.
- Density: 1.30–1.40 g/cm³.
- Melting Point: ≈ 200–220 °C.
- Chemical Resistance: Excellent (oils, fuels, solvents).
- Continuous Heat Resistance: 110–130 °C.
🚗 Where POM+PA is used in the automotive industry
| Component | Example parts | Observations |
| Moving Mechanisms | Gears, sliders, levers | Reduced friction coefficient |
| Fasteners / Clips | Clips, hinges, latches | Mechanical strength and elasticity |
| Technical Housings | Covers, supports, bearings | Dimensional and thermal stability |
| Interior Systems | Sliding parts, fine mechanics | Smooth finish and high durability |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 240 – 260 °C | Fast welding, uniform melting |
| Plastic Extrusion | 230 – 250 °C | Ideal for thick technical parts |
| Heat Plate (Mirror) | 230 – 250 °C | Clean bonding without bubbles |
🔩 Material Compatibility
- ✅ Compatible: POM, POM-C, POM-H, PA6, PA66, PA+GF, POM+PBT.
- ⚠️ Good Compatibility: PA+MD, PA+PPS, PA+PBT.
- ❌ Incompatible: PP, PE, PVC, PS, ABS, PC (completely different melting points).
💡 ReplastMD Recommendation: Use POM+PA or POM-C / PA66 rods at 250 °C. Clean the surface thoroughly; any oil residue will compromise adhesion. Maintain constant pressure during welding for a dense, high-quality joint.
🧠 How to Identify POM+PA
- Engraved marking: >POM+PA<, >POM/PA<, >Hostaform<, >Ultraform<.
- Texture: Semi-glossy, rigid, and dense.
- ReplastMD practical test: Burns with a blue flame, releasing a combined scent of formaldehyde and burnt hair (nylon). Softens at ≈ 210 °C.
🛠️ POM+PA Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional POM+PA welding for precision gears and technical housings, ensuring a clean, stable finish that restores factory-spec friction levels.