What is PETG?
PETG is a transparent plastic, is a non-crystalline copolyesters, light transmission rate of nearly 90%. Glycol-modified PET and copolyesters (PETG) offer a desirable combination of properties such as clarity, toughness, and stiffness.
Drying is essential for PETG before injection molding. The moisture level must be below 0.04%. Drying temperature is not to exceed 66 C [150 F]. Drying at approximately 65 C [149 F] for 4 hours is recommended. Melt Temperature 220 C 290 C [428 F 554 F]; the melt temperature is grade specific Mold Temperature 10 C 30 C [50 F 86 F], recommended 15 C [60 F] Material Injection Pressure 30 MPa-130 Mpa Injection Speed High speeds without causing embrittlement Chemical and Physical Properties PETGs (or copolyesters) are glycol-modified PETs.
The modification is achieved by adding a second glycol during polymerization. The resulting molecular structure is irregular and the material is clear and amorphous with a glass transition temperature of 88 C [190 F]. PETGs can be processed over a wider processing range than conventional PETs and offer a good combination of properties such as toughness, clarity, and stiffness.