What is Polyethylene terephthalate glycol (PETG)?

Polyethylene terephthalate glycol (PETG) is a thermoplastic widely used in applications that require mechanical strength, good transparency, and ease of processing. It is a modified version of PET (polyethylene terephthalate), with glycol added during polymerization to improve impact resistance and prevent crystallization during cooling, making it more ductile and easier to mold.

One of the main advantages of polyethylene terephthalate glycol (PETG) is its excellent optical clarity. With high light transmission and low haze, it is ideal for applications where product visibility is essential, such as transparent packaging, displays, signage, or protective shields. It also maintains good chemical and thermal resistance, making it a balanced material for both technical and aesthetic uses.

Polyethylene terephthalate glycol (PETG) offers excellent impact resistance—far superior to standard PET or other transparent plastics like acrylic. This makes it perfect for durable parts such as dispensers, protective housings, display furniture, and medical equipment. It is also popular in 3D printing due to its easy extrusion, low shrinkage, and good layer adhesion, resulting in stable parts with high-quality finishes.

From a processing standpoint, polyethylene terephthalate glycol (PETG) can be molded using injection, extrusion, or thermoforming techniques. Its processing temperature range is relatively low compared to other technical plastics, reducing energy consumption and enabling faster cycles. In thermoforming, for instance, it performs very well with minimal risk of stress cracking, which is ideal for producing large, detailed components.

Another strong advantage of polyethylene terephthalate glycol (PETG) is its chemical resistance to cleaning agents, alcohols, and mild acids, making it suitable for medical environments, laboratories, and consumer products that require regular hygiene and disinfection. It also complies with food contact regulations, and is therefore used in packaging, trays, bottles, and containers for food and beverages.

At Plásticos Lezo, we recognize the value of polyethylene terephthalate glycol (PETG) as a versatile solution for parts that require transparency, strength, and ease of processing. While our core specialty is precision injection molding, we are fully equipped to work with materials like PETG when the project demands it—whether for prototypes, small series, or specific technical components.

Our technical team provides guidance on selecting the most suitable material based on the client’s functional, aesthetic, and regulatory requirements. In the case of polyethylene terephthalate glycol (PETG), we evaluate its suitability for applications that demand impact resistance, high visual presentation, and stress-free forming. We also assist with mold design and process optimization to ensure a high-quality result.

In summary, polyethylene terephthalate glycol (PETG) is a modern and versatile material that combines clarity, strength, and processability, making it ideal for a wide range of applications in sectors like packaging, medical, advertising, electronics, or retail. Its balance of aesthetics and performance makes it a smart alternative to other transparent plastics, especially when a professional finish is required without compromising durability or functionality.