None. All "PETG" filament is G Poly (Glycol-modified PET). The "G" stands for glycol. This article is a general guide. Always consult material datasheets for specific engineering requirements.
This article will explore the chemistry, properties, manufacturing processes, and diverse applications of G Poly, explaining why it is becoming the go-to material for designers, engineers, and packaging specialists. To understand G Poly , one must first understand its parent polymer: Polyethylene Terephthalate (PET). PET is created by a condensation reaction between ethylene glycol and terephthalic acid. In standard PET, the polymer chains align closely, allowing for crystallization when cooled slowly. This crystallization gives PET its strength but also makes it difficult to thermoform and prone to stress whitening. g poly
Yes, it is softer than glass and acrylic. Use a scratch-resistant hard coating for high-touch applications. This article is a general guide
Yes. High-quality G Poly is FDA-approved for food contact and is BPA-free. To understand G Poly , one must first
However, closed-loop recycling for G Poly exists. Industrial scrap (trim from thermoforming, mis-printed sheets, and support structures from 3D printing) can be reground and re-extruded into new sheet or filament without significant loss of mechanical properties. Emerging chemical recycling technologies (glycolysis) can break G Poly back down into its monomers—EG, CHDM, and TPA—to create virgin-quality resin.
Chemically, G Poly is a Class 1 plastic (PET) in terms of resin identification code, though it is often labeled "7-Other" due to the glycol modifier. It be recycled, but not alongside standard PET bottles because the CHDM modifier lowers the melting point of the recycled stream, contaminating the PET recycling loop.
Only on the top rack with a low-heat (air dry) cycle. Standard dishwashers exceed 70°C, which will warp and deform G Poly.