Alternative to acrylic, PETG/PCTG
Release date:
2021-06-26 14:17
Author:
Editor
ETG/PCTG is a non‑crystalline copolyester (whereas Coca‑Cola or purified water bottles are made from crystalline polyester, commonly known as PET, which is produced via a three‑step injection‑stretch‑blow molding process). During its production, replacing a portion of the ethylene glycol with 1,4‑cyclohexane dimethanol (CHDM) prevents crystallization, thereby enhancing both processability and transparency. The resulting material exhibits high clarity and excellent impact resistance, making it particularly well suited for molding thick‑walled, transparent parts. It can be shaped into virtually any form according to the designer’s vision and is compatible with conventional processing techniques such as extrusion, injection molding, and blow molding. Moreover, PETG/PCTG products offer outstanding post‑processing capabilities, allowing for modification through standard manufacturing methods. In addition, this copolyester complies with U.S. FDA food‑contact regulations, making it suitable for use in food‑grade, medical, and hygiene applications.
First of all, it is a transparent material; therefore, we will repeatedly select transparent materials for comparison.
1. PETG/PCTG is first and foremost a highly transparent plastic.
It boasts excellent optical performance, a high-gloss surface, and low haze. Its light transmittance is close to 90%, very similar to that of acrylic (PMMA) and superior to polycarbonate (PC).
2. PETG/PCTG exhibits broader chemical resistance (e.g., to coffee, chocolate, oils, acids, etc.).
It exhibits excellent chemical resistance to the following substances: automotive oils, soap solutions, detergents, cleaning agents, carpet cleaners, toothpaste and peppermint oil, perfumes, edible oils, 2-propanol, hydrocarbon solvents, and more.
3. It is one of the few environmentally friendly plastic materials available today.
It is considered an environmentally friendly material because, when burned, it produces only carbon dioxide and water, thereby helping to protect the natural environment. Since 2006, many developed countries—including those in Europe, North America, and Japan—have been actively promoting the use of eco‑friendly materials similar to PETG. (PETG is certified by SGS, the FDA, and MSDN.) As a result, PETG has become one of the alternatives to non‑eco‑friendly transparent materials such as PVC. Whenever your customers suggest using environmentally friendly plastics, PETG should be your first choice.
4. PETG/PCTG is particularly well-suited for molding thick, transparent parts.
Thick-walled PETG products can maintain equally excellent light transmittance, while PETG/PCTG offerings feature a transparent ice-blue base that aligns with global trends, boasting an exceptionally smooth surface and a striking visual impact. Moreover, their thick-walled or solid‑wall counterparts are less prone to bubble formation during processing.
5. PETG/PCTG exhibits exceptionally high toughness, excellent tensile properties, and good impact resistance.
Among transparent plastics, PC boasts excellent toughness and impact resistance but poor tensile properties; acrylic exhibits inferior tensile performance, toughness, and impact resistance; PETG, on the other hand, offers exceptionally high toughness and outstanding tensile strength, with a stretch ratio exceeding 180% and an impact strength several times that of acrylic—though slightly lower than PC. Meanwhile, PCTG is a versatile transparent plastic that approaches acrylic in impact resistance. Both PC and PCTG are renowned for their “unbreakable” reputation, thanks to their superior toughness, which significantly reduces breakage during secondary processing, transportation, installation, and use, thereby lowering overall product costs. Another notable advantage of PETG/PCTG is that its physical and mechanical properties remain virtually unchanged even at low temperatures.
6. They exhibit interesting secondary processing properties.
Its excellent ductility enables a wide range of secondary processing methods for PETG and PCTG. You can laser‑cut, mill, die‑cut, drill, weld, stamp, thermoform, or cold‑bend (for thicknesses under 2.5 mm) these materials, as well as fasten them with screws, rivets, or bolts. By contrast, PC exhibits inferior secondary‑processing performance, as it is more prone to stress concentrations during molding. Any one of these secondary processes can disrupt the material’s internal stress balance or lead to cracking.
7. Exhibits excellent printability and coating performance.
In other words, PETG and PCTG plastic products can be printed (by spray coating, screen printing, pad printing, hot stamping, etc.) or coated without any special corona treatment on the surface, and they exhibit excellent adhesion to surface coatings. (Note: Although PETG and PCTG offer a broad range of chemical resistance, they cannot guarantee compatibility with all solvents found in coating materials; therefore, please customize coating formulations specifically suited for PETG and PCTG in advance.)
8. They exhibit excellent adhesion properties.
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