PETG is a material that is in the same family as PET, which for example, plastic bottles are usually made of. As opposed to traditional PET, Polyethylene terephthalate, PETG has glycol.
The function of glycol is to make the plastic less brittle and more resistant to wear and corrosion. However, even though it may have superior technical properties, PETG has higher processing temperate than its predecessor, making it more difficult to recycle. For companies who design for sustainability, this can pose a major obstacle when thinking of employing PETG for their products.
PETG has also become popular among the 3D printing community that previously used mostly PLA and ABS.[:]