PETG, PCTA, and PCTG are glycol-modified copolyesters, or otherwise known as “glass” polymers.
These materials are amorphous copolymer thermoplastics with above average chemical resistances when compared to other amorphous materials such as ABS or PMMA. They have excellent physical properties for a wide variety of packaging types and offer superior clarity over clarified PP.
Glass polymers have the same clarity and high luster as glass and are used for thick-walled containers for products such as high-quality cosmetics. They also have excellent chemical resistance, impact resistance and other characteristics. The variations of copolyesters differ in chemical composition but have relatively similar properties. PETG offers glass-like clarity and high stiffness.
PCTG also offers excellent clarity and better impact resistance and elongation than Polycarbonate (PC), making is suitable for relatively high load bearing applications. PCTA has a higher heat deflection temperature (HDT), toughness, and impact strength than PETG.
Copolyesters are widely used in the cosmetic industry because their superior aesthetic qualities make for a unique and eye-catching package. These materials offer brilliant sparkle and clarity, a density that approaches the feel of glass, ease of decoration, excellent chemical resistance, significant impact resistance, and the ability to mold thick walled parts without any haze or fogginess. Others have found use for copolyesters in the medical packaging, appliance and consumer industries.