PETG.
Glycol-modified PET.
Optical clarity.
PETG (Polyethylene Terephthalate Glycol) — modified PET with glycol. Better impact, less brittle, easier to thermoform than standard PET. Standard for medical, signage, displays.
Key principles.
Modified PET
Glycol modification prevents crystallization. Stays amorphous, transparent.
UTS 50 MPa
Higher impact than PET. Stiff, dimensionally stable.
>91% transparency
Water-clear like PET. UV-stable optical clarity.
Easy
Excellent thermoforming. Standard for displays, point-of-purchase, signage.
Good
Resists acids, alcohols, oils. Limited vs ketones, ammonia.
FDA approved
21 CFR 177.1630. Standard for food packaging.
FAQ
PETG vs PET?
PETG: amorphous, easy to process, more impact-resistant. PET: crystalline, slightly cheaper, stretched-blow process.
PETG vs acrylic?
PETG: stronger, more impact-resistant, FDA-approved. Acrylic: clearer, more scratch-resistant, brittle.
Sterilizable?
Gamma sterilization OK. Steam autoclave NOT — softens. EtO acceptable.
Major applications?
Medical disposables, food containers, retail displays, machine guards, 3D printing filament.
Recycling?
Recyclable but contaminates PET stream. Mark with #1 PETG specifically.
3D printing?
Popular FDM filament. Easier than ABS, more durable than PLA.