What you need to know about PETG!

BACKGROUND:

PETG is colorless and odorless in its natural state. The “G” in “PETG” illustrates the Glycol modification within the polymer. This material is food grade safe but non-biodegradable yet efficiently recyclable. The most common everyday uses of PETG includes plastic water bottles and in 2016 it was estimated that 56 million tons of PETG are recycled each year. This material was patented in 1941 by John Rex Whinfield, who was a contractor working with DuPont, using the trademark “Mylar” in June 1951 

Through varying transformative processes, PET can be made to be semi-rigid to rigid and is very light. It is also able to provide a barrier for solvent, alcohol, and gas. PETG changes color to a pure white when exposed chemicals such as toluene and chloroform. *NOTE* PETG IS HYGROSCOPIC! It is important to keep the filament in dry storage, preferably a filament drying chamber. However, if the filament were to become PETG is extruded, the water hydrolyzes the filament, decreasing its resilience properties. When working with PETG its important to be very cognoscente of the ooze shield and retraction settings to avoid commonly seen stringing and oozing ( more depth analysis within the printable takeaway guide). 


STRENGTHS:

   FLEXIBLE      IMPACT/CHEMICAL RESISTANT    FOOD SAFE - NONTOXIC

WEAKNESSES

      HYGROSCOPIC         POOR BRIDGING       OOZING/ STRINGING

APPLICATIONS:

Many industries utilize PETG for a variety of different applications.  PET-G is food grade safe so many applications revolve around packaging for food, beverage, agriculture and more items. Compared to other materials PETG has been trending with expected sales of filament surpassing ABS in 2028.Applications for PETG include:

  • Snap fit enclosures
  • Food and Beverage Containers
  • Garden Pots and Tools 
  • RC Boats
  • Wine Cork Replacement 
  • Wearable Accessories 
  • Flexible Decorative Pieces 
  • Point of Purchase and Display Frames

CASE STUDY: Self Home Renovation During COVID 19 Quarantine

Finding ways to be productive during quarantine may be tough however some individuals have taken it upon themselves to do a little home renovation. Not able to go to store for adequate supplies, 3D users have been able to use their unique skills and technology to skip the supply chain completely and take-home renovations into their own hands.

PET-G’s strength and electrical resistance allows users to replace old or damage wall mounts for lighting, TV, and speakers. Comparatively, PETG’s rigidity prevents warping that is quite a prevalent issue with materials like PLA. To simulate a mountable lighting bracket, Filament Hub team members conducted a test between both materials and began with creating a model using AutoCad. The printed piece was 8 inches in length, 3.5 inches wide and 2.5 inches thick, capable of being screw mounted to a wooden pole with a thick hook to hold weight on the other side. Note that the infill had been raised to 85% for each model. An 8-pound weight was attached to each hook and left hanging over a period of one week. Within a day, the PLA had already begun to warp near the bracket mounting that was screwed into the wood pole while the PETG remained solid. By the end of the week the PLA was drooping way below the PETG with PETG remaining the same. This test was conducted in indoor conditions. Outdoor conditions may prove to be even more detrimental to a PLA appliance model but likely similar results for the PETG.

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