Polycaprolactone (PCL) is a biodegradable polyester with a low melting point of around 60 °C and a glass transition temperature of about −60 °C. The most common use of polycaprolactone is in the manufacture of speciality polyurethanes. Polycaprolactones impart good water, oil, solvent and chlorine resistance to the polyurethane produced.
P 1966 (OTTO) Polycaprolactone Mn 70,000-90,000 Cas 24980-41-4 - used for splinting, modeling, and as a feedstock for prototyping systems such as fused filament fabrication 3D printers.