🧩 PPS+Valox – Polyphenylene Sulfide + Valox® (PBT blend)
(A high-performance composite blending the thermal and chemical stability of PPS with the elasticity and impact resistance of PBT (Valox®). Resistant up to 220–240°C, durable, and dimensionally stable.)
🔹 What is PPS+Valox
PPS+Valox is a compatibilized blend where PPS provides rigidity and chemical resistance, while Valox® (PBT) contributes toughness, flexibility, and better processability. This combination improves impact behavior and reduces internal stresses while maintaining the heat and chemical resistance required for harsh engine bay environments.
🔧 Composition & Properties
- Base: 60–80% PPS, 20–40% PBT (Valox®).
- Density: 1.40–1.50 g/cm³.
- Melting Point: ≈ 270–290 °C.
- Chemical Resistance: Excellent (oils, fuels, solvents).
- Continuous Heat Resistance: 210–230 °C.
🚗 Where PPS+Valox is used in the automotive industry
| Component | Example parts | Observations |
| Engine / Thermal | Sensor housings, pumps, EGR covers | Thermal stability and rigidity |
| Electrical / Connectors | Coil covers, sensor plates | Chemical resistance, great insulation |
| Fuel / Braking | Fluid contact parts | Low shrinkage, dimensional stability |
| Structural / Supports | Covers, clips, frames | Balance of hardness and resilience |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 290 – 310 °C | Controlled melting, stable flow |
| Plastic Extrusion | 280 – 310 °C | Recommended: PPS or PPS+PBT rod |
| Heat Plate (Mirror) | 280 – 300 °C | Clean bonding, zero oxidation |
🔩 Material Compatibility
- ✅ Compatible: PPS, PBT, PPS+GF, PBT+PPS, PBT+GF, PPA.
- ⚠️ Good Compatibility: PPS+Noryl, PPS+CF, PPS+PA, PPS+PEEK.
- ❌ Incompatible: PP, PE, PS, ABS, PC, PET (completely different melting points).
💡 ReplastMD Recommendation: Use PPS or PPS+PBT (Valox) rods at 300°C. Heat uniformly and avoid excessive pressure to prevent phase separation. Slow cooling ensures a compact structure and a perfect bond.
🧠 How to Identify PPS+Valox
- Engraved marking: >PPS+VALOX<, >PPS+PBT<, >RYTON PBT<, >FORTRON PBT<.
- Texture: Semi-glossy, fine, with moderate rigidity.
- ReplastMD practical test: If the part is rigid but slightly elastic with a smooth finish and PPS+Valox markings, it’s confirmed. Softens at ≈ 285 °C.
🛠️ PPS+Valox Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PPS+Valox welding for sensor housings and technical fittings, ensuring a high-strength, vibration-resistant, and factory-grade finish.