🧩 FLS – Special Fluoroelastomer (High-Performance Synthetic Fluor-Rubber)
(A next-generation fluoroelastomer derived from the FKM/FPM family, formulated to offer superior chemical and thermal resistance. Used in critical automotive and industrial applications where long-lasting seals are required at extreme temperatures.)
🔹 What is FLS
FLS is a complex fluor-copolymer. At ReplastMD, we treat it as an enhanced version of FKM. By optimizing the blend with special additives and TFE monomers, FLS achieves extended thermal stability (up to 230 °C) and excellent resistance to oxidative agents. It is designed to have a longer service life in severe environments involving oils, fuels, steam, and acids.
🔧 Composition & Properties
- Polymer Base: Fluorinated copolymer (VDF-HFP-TFE).
- Density: ~ 1.75 – 1.90 g/cm³.
- Operating Range: Up to +230 °C.
- Chemical Resistance: Excellent (oxidative agents, synthetic oils, steam).
- Visuals: Dense, smooth rubber with slow recovery; black, dark grey, or dark brown.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| EGR Gaskets / Simmerings | Toyota, VW, Renault | Resists 230 °C and synthetic oils |
| Fuel / Turbo Hoses | BMW, Mercedes | Excellent elasticity and pressure resistance |
| Injection Seals / Pumps | Hyundai, Peugeot | Chemical stability with modern fuels |
| Hybrid Gaskets | Ford, Nissan | High durability, no cracking or swelling |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | ✅ 250 – 270 °C | Controlled surface melting, avoid overheating |
| Chemical Bonding | ✅ Recommended | Specialized fluoro-adhesives (Loctite® FPM/FLS) |
| Heat Plate | ⚠️ Limited | Possible only for very thin profiles |
💡 ReplastMD Recommendation: FLS is repaired or bonded rather than welded in the traditional sense. We use specialized adhesives for fluoroelastomers and apply controlled hot air (~260 °C) only for activation. It is the ideal solution for seals and hoses exposed to high-temperature fluids and steam.