🧩 PEI-FR – Flame Retardant Polyetherimide (Ultem®)
(A high-performance amorphous thermoplastic derived from PEI, modified with halogen-free flame retardant additives. It combines structural rigidity and thermal stability up to 200 °C with natural electrical insulation and self-extinguishing properties.)
🔹 What is PEI-FR
PEI-FR is the “gold standard” for flame-resistant engineering plastics. At ReplastMD, we treat it as the ultimate safety polymer. Known predominantly under the brand name Ultem®, it features an aromatic molecular structure that provides extreme mechanical strength. The FR version meets UL94 V-0 standards, making it the preferred choice for automotive ECU housings, sensors, and connectors located in high-heat zones.
🔧 Composition & Properties
- Polymer Base: Polyetherimide (PEI) ~90%.
- Flame Retardants: Halogen-free phosphates and metal oxides.
- Density: ~ 1.27 – 1.35 g/cm³.
- Operating Range: Constant use up to +200 °C.
- Visuals: Amber-gold, brownish-transparent, or technical black; rigid and smooth.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Electric Connectors | BMW, Toyota, VW | UL94 V-0 class, stable at 180–200 °C |
| ECU / Relay Housings | Renault, Ford | High electrical insulation and fire safety |
| High-Heat Trim | Mercedes, Peugeot | Resistant to thermal deformation |
| Rigid Tech Supports | Hyundai, Dacia | Maintains shape and stiffness under load |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | 340 – 360 °C | Controlled welding required to avoid carbonization |
| Heat Plate (Mirror) | ✅ Recommended | Homogeneous bonding without discoloration |
| Extrusion | ✅ Possible | Processable for high-end technical rods and sheets |
💡 ReplastMD Recommendation: Weld at ~350 °C using digital temperature control or teflon-coated heating plates. PEI-FR is the ideal material for housings and electrical components requiring structural rigidity, flame resistance, and extreme thermal stability.