What is PET?
PET (polyethylene terephthalate) is the most common type of polyester material on the market. It is valued for its excellent mechanical, electrical, chemical resistance, and thermal properties. PET was patented in 1941 by Dickson and Whinfield when they combined phthalic acid with glycol-based substances. When used for fabric, PET is known as polyester, though it’s not technically the only form of polyester. Modern PET is composed of ethylene glycol and terephthalic acid. Ethylene is a colorless liquid derived from glycol while terephthalic acid is a solid crystal that comes from xylene. Beyond clothing, you’re likely to find PET employed for waterproofing, bottling, food packaging, Tupperware, and insulated bottles. This article will discuss PET primarily in the context of 3D printing and look at its uses, properties, and applications.
What is PET 3D Printing?
PET 3D printing is the process of creating a three-dimensional part using PET (polyethylene terephthalate) via additive manufacturing. This type of PET is a stiff, strong material used to make products for waterproofing, bottling, and food packaging. It’s one of the most popular materials for FDM/FFF-style 3D printing due to its chemical resistance, mechanical properties, and favorable melting temperature of 260°C. For more information, see our guide on 3D printing.
Composition of PET Filament
Polyethylene terephthalate is a type of polyester made through an esterification reaction of ethylene glycol and terephthalic acid. The ethylene content makes it colorless. The higher percentage of the repeated aromatic units in the polymer chain gives it strength and toughness. PET is valued for its good chemical resistance, mechanical and thermal qualities, and dimensional stability owing to its polyester structure.
Due to its thermal strength, PET 3D printing filament is used for automobile tire yarns, drive belts, seat belts, and fire hoses. It has largely replaced nylon. The chemical resistance of PET prevents it from reacting with food or water and thus makes it excellent for food packaging.
Properties of PET Filament
The desirable properties of PET filaments are:
- PET filament has excellent mechanical, electrical, and thermal properties.
- Has good flow properties and low absorption features.
- It is FDA-approved for food containers
Use of PET in 3D Printing
PET is unique in that it is virtually shatterproof. It has excellent dimensional stability, good heat resistance, and strong chemical resistance. These properties make PET a desirable material for bottles, containers, and food packaging. It also makes it more resistant to tears.
Listed below are some tips on how to effectively print PET:
- Print in an enclosed chamber to maintain an even temperature distribution. This enclosed chamber prevents warping and rough surfaces.
- Allow newly printed parts to cure at room temperature for four hours.
Model specifications
| 尺寸 | 25 × 25 × 15 公分 |
|---|---|
| Specification | 1.75 mm 1 kg, 1.75 mm 2.5 kg, 2.85 mm 1 kg, 2.85 mm 2.5 kg |
| Density | 1.25 g/cm³ |
| Melt Index | 10 g/10min |
| Tensile Strength (X-Y) | 58.19 Mpa |
| Elongation at Break (X-Y) | 2.85% |
| Bending Strength (X-Y) | 85.27 Mpa |
| Flexural Modulus (X-Y) | 2236 Mpa |
| Notched Impact Strength (X-Y) | 4.35 KJ/m2 |
| Heat Deformation Temperature (0.45MPa) | 74℃ |
| Storage Environment Humidity | ＜20%RH |
| Drying Conditions Before Printing | 60℃，8H |
| Print Speed | ＜300 mm/s |
| Nozzle Material Requirements | Stainless steel nozzles |
| Printing Temperature | 260-300℃ |
| Characteristic | High cost performance, high speed and easy printing, no warping, low shrinkage, easy to remove supports, printing without sealing at room temperature |
| Color | Full color, Customizable |
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