PETG (Glycol-modified PET; Copolyesters)
Typical Applications
PETGs offer a desirable combination of properties such as clarity, toughness, and stiffness. Applications include medical devices (test tubes and bottles), toys, displays and lighting fixtures, face shields, and refrigerator crisper pans.
Injection molding processing conditions
Drying |
Drying is essential for PETG prior to 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 - 290 C (428 - 554 F); The melt temperature is grade specific |
Mold Temperature |
10 - 30 C (50 - 86 F); Recommended: 15 C (60 F) |
Material Injection Pressure |
30 -130 MPa |
Injection Speed |
High speeds without causing embrittlement |
Chemical and Physical Properties
PETGs (or copolyesters) are glycol modified PETs; the modification is done 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 good combination of properties such as toughness, clarity, and stiffness.
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