What is PETG

PETG is another favorite 3D printing materials among users. To know its characteristics, we will compare this compound with the other two most used materials in the 3D printing industry, PLA and ABS.

One of the properties of this plastic derivative is its temperature resistance , it supports a little more than PLA, but less than ABS. It begins to soften at 80ºC, while PLA does it at 70ºC and ABS at 105ºC.

As for resistance, the PETG resists shock and effort better, making it the most difficult to break. In addition to having better theoretical properties than ABS , the higher adhesion of the layers makes PETG parts even more resistant in practice. Speaking now of its rigidity, it is less rigid than PLA and ABS, but in this case the difference with ABS is minimal.

Other interesting facts about this compound, is that is approved by the FDA (the US agency that regulates food, medicine and cosmetics) for food use. In addition, it is very stable and chemically resistant to the attack of acids and bases.

Characteristics of parts in PETG

Ideal for objects that experience stress
Approved for food use
Resists blows very well
It is a recyclable material
It weakens with UV rays
Hard to machine and shape

Available colours

Black
Pantone
Black
White
Pantone
White
Blue
Pantone
7689C
Red
Pantone
485C

Technology used

FDM or molten deposition modeling is a manufacturing process used for the prototype modeling and the production of small and medium runs . This modeling uses an additive function, depositing the material in layers, to form the piece.

A filament that is initially stored in rolls is used, and it is inserted into a nozzle that is above the melting temperature of the material and can travel in three electronically controlled axes. The nozzle moves to drop the material in the correct location, drawing the model line by line. When a layer is drawn, the base drops by a layer thickness (0.1-0.4) so that the printer can continue with the next layer.

When the model to be printed has sections that protrude or have a high angle, a support structure is created where it is considered necessary and printed on a material that can later be easily removed, in some cases soluble. This is done so that the model does not settle in the air, thus preventing the layer from falling.

Examples of this material

Properties table

PROPERTY VALUE TEST METHOD
Density 1,12 g/cm^3 ISO 1183-1-A
Strain strength 45 MPa DIN 53504-S2
Flexural strength 70 MPa ISO 178
Tensile strength 50 MPa ISO 527
Elongation 54 % ISO 527
Softening temperature 85 ºC ASTM D3418