PETG materials

Glycol-modified PET and copolyesters (PETG) offer a desirable combination of properties such as clarity, toughness, and stiffness.

Typical Applications

• medical devices

  • test tubes
  • bottles

• toys

• displays and lighting fixtures

• face shields

• 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°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.