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Engineering Plastic

PETG

PETG is glycol-modified PET, an amorphous copolyester that is optically clear, tougher than PET, and exceptionally easy to thermoform and 3D print. At about 50 MPa tensile with 120% elongation, it absorbs impact without shattering, though its 65 C service ceiling keeps it out of hot applications.

How PETG machines

Rated 3/5. It machines acceptably but its ductility means it can deflect and grab; sharp tooling, light cuts, and good chip clearance help avoid melting and stringing. Many PETG parts are formed or printed rather than machined, where its smooth flow and low warp shine.

Manufacturing & processing

Injection molded, extruded into clear sheet, and very popular for 3D printing because it prints with low warping and good layer adhesion. Its standout trait is thermoforming: it draws deeply and cleanly without the drying and crystallization issues that complicate PET, making clear guards and trays simple.

Typical applications

Machine guards, clear enclosures and face shields, retail displays, signage, blister and clamshell packaging, and 3D-printed functional prototypes. Its clarity, toughness, and food-contact compatibility suit point-of-sale fixtures and protective covers that must not crack on impact.

When to choose it

Choose PETG when you need a clear, impact-tough sheet that thermoforms or prints easily and stays cheap. Pick PET or acrylic instead when you need higher stiffness, scratch resistance, or temperature; pick polycarbonate when you need maximum impact strength and heat together. Avoid it above roughly 60 C.

Suitable surface finishes

Common finishes for PETG: bead blasting, powder coating. Use the finish selector →

FAQ

Why is PETG so popular for 3D printing?
PETG prints with low warping, strong layer adhesion, and good toughness, sitting between easy PLA and stronger-but-finicky ABS. It tolerates a wide temperature window, resists cracking, and is food-contact friendly in suitable grades, making it a reliable choice for functional parts and clear prints.
Is PETG stronger than acrylic?
PETG is far more impact-resistant and will flex rather than shatter, while acrylic is stiffer, harder, more scratch-resistant, and optically sharper. For shatter-prone guards and shields, PETG wins; for rigid, glossy, scratch-resistant display panels, acrylic is usually the better look and feel.
What temperature can PETG handle?
Its practical service ceiling is low, around 65 C, so it softens in hot cars, near heaters, or under sustained sunlight heat. For warm environments choose PET, polycarbonate, or a higher-temperature engineering plastic. PETG is best kept to room-temperature and lightly warm applications.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.