🧩 PCL – Polycaprolactone
(Biodegradable and flexible material from the aliphatic polyester family. PCL is known for its low melting point, good elasticity, and excellent compatibility with other biopolymers like PLA and PHA. Used in soft parts, bio-adhesives, and eco-friendly prototypes.)
🔹 What is PCL
PCL (Polycaprolactone) is a semi-crystalline biodegradable polyester. At ReplastMD, we treat it as a highly malleable “smart” material. Its most striking feature is that it softens at just 60 °C, making it easy to reshape without chemical degradation. It features a rubbery texture and a glossy surface, making it ideal for flexible prototypes, specialized bio-adhesives, and low-temperature repairs.
🔧 Composition & Properties
- Polymer Base: Aliphatic Polyester (ε-caprolactone).
- Density: 1.14 – 1.16 g/cm³.
- Melting Point: 58 – 65 °C.
- Operating Range: –40 °C to +60 °C.
- Chemical Resistance: Good (oils, greases, cold water).
- UV Resistance: Moderate.
🚗 Where PCL is used in the automotive industry
| Component | Example parts | Observations |
| Bio Flexible Parts | Gaskets, soft covers | Malleable, ecological, no fumes |
| Hot-melt Adhesives | Bio-bonding / demo parts | Reactive at 60–70 °C |
| Prototype Parts | Bio-testing components | Easily reshaped via heat |
| Flexible Inserts | Interior decorative zones | Glossy, natural, smooth look |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | ✅ 70 – 90 °C | Easy to weld, no smoke, clean melt |
| Heat Plate (Mirror) | ✅ 70 – 80 °C | Smooth, glossy bond |
| Manual Extrusion | ⚠️ 80 – 100 °C | Possible, but flow is very fluid |
| Chemical Bonding | ✅ Recommended | Soft polyester or epoxy adhesives |
💡 ReplastMD Recommendation: PCL welds excellently with hot air at 80 °C, providing a clear joint without oxidation. It can be completely remodeled with gentle heat, making it perfect for controlled bio-repairs and adjustments.