The temperature above which a given material transitions from hard material to a rubbery material. In polymers, materials below the glass transition temperature are rigid and brittle. Above the temperature they are easily deformed and may freely flow.
In additive manufacturing, the glass transition temperature is important because above that temperature, material can be transported and deposited. Then when it cools below that temperature, it hardens and bonds with the previous layer. Most polymer material extrusion system work on this principal.
Categories: Material
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