Materials
Glass transition temperature (Tg)
Also known as: transicion vitrea · transición vítrea · tg · glass transition · hdt · temperatura de deflexion
Short definition
The glass transition temperature is the point at which an amorphous plastic goes from rigid to rubbery, and it marks the practical service limit of a printed part.
Full definition
It is not a melting point: the part does not melt, it softens and loses stiffness, and under load it deforms gradually. Data sheets usually list it alongside heat deflection temperature (HDT), which is the practical figure: Prusa reports 55 °C for PLA, 68 °C for PETG, 93 °C for ASA and 113 °C for its PC Blend, all at 0.45 MPa. That is the number to check before printing a part for a car dashboard or a lamp.
Related terms
- PLAPLA is a plant-derived thermoplastic, the most used filament in home 3D printing thanks to how easily it prints and how little it warps.
- DensityA printing material's density, in grams per cubic centimetre, is the figure that turns the volume reported by the slicer into grams and, from there, into money.
- FilamentFilament is the plastic thread wound on a spool that feeds FDM-type printers, normally 1.75 mm in diameter.
Materials
Updated
Sources
- [1]Technical datasheet — Prusament PC Blend by Prusa PolymersPrusa Polymers · Manufacturer · accessed July 27, 2026