PET

PET Filament

POLYETHYLENE TEREPHTHALATE

PET is a thermoplastic belonging to the polyester family and one of the most important thermoplastics due to the quantity used in the industry. The PETG filament is a modified version of PET and is also called co-polyester. This enhancement, which is necessary for 3D printing, is achieved by adding a second glycol. This makes it more durable, more impact-resistant and does not make it brittle even if it is heated regularly.

The PETG filament is very good thermoformable. Both the printed image and the layer adhesion are very good. Elements printed from PETG can even be sterilized and are therefore also used in medical industry. In addition to its high resistance and optimal mechanical properties, PETG is chemical-resistant, flame-retardant and certified as a food-safe polymer. Therefore, it is used both for processing and packaging food, but also in the pharmaceutical sector. In addition, this material is 100% recyclable. PETG is even known to combine the advantages of ABS (temperature resistance, durability and strength) and PLA (easy to use) in one filament.

Processing parameters:

Extrusion temperature: 215 °C
Print bed temperature: 60 °C – 80 °C
Print bed material: Kapton foil

The PET filament is usually the glycol-enhanced version, PETG. The added glycol molecule prevents the normally “partially crystalline” plastic from crystallizing. Which makes it more ductile and can be processed at a lower temperature. In this way, transparent filaments can also be produced.

PETG is tougher than most other filaments and might pull thin threads, so-called “angel hair” after a layer is printed. To avoid this effect, it is recommended to increase the “Retraction Distance”, as well the “X / Y Axis Movement Speed” in order to cut those threads off once the layer is printed.

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Post-Processing

PETG can be welded, screwed directly or a screw-nut can be put in. Due to its high chemical resistance, PETG can only be glued with Urethane and Cyanoacrylate based industrial glues. When machining, care must be taken to ensure that the workpiece does not heat up too much, as otherwise the printed workpiece might be damaged by the melted plastic.

Due to its chemical resistance, PETG cannot be painted or coated, so components that should have a certain color should be printed straight with this color.

Solubility / resistance

Resistant to weak acids, alkaline solutions, oils, fats, aliphatic and aromatic hydrocarbons and carbon tetrachloride.

It is not resistant to strong acids and alkaline solutions, phenol and if used for a long time in hot water above 70 ° C.

Applications

The maximum operating temperature of PETG is 70 ° C

PETG combines the simple handling of PLA with almost as good mechanical and thermal properties as ABS. In addition, PETG is more resistant to chemicals, food safe and flame retardant. As elements printed out of PETG can be sterilized, they are also used in medical technology.

PETG is also often used to produce visual objects, for example in architecture. Because of the good thermal plasticity, the good layer adhesion and the good optical surface of the material it simplifies the production of aesthetic prototypes.

Since the polymer chains are hardly damaged even by multiple melting (within reasonable temperatures) and mechanical reprocessing of PETG, the plastic is 100% recyclable.

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