Polyethylene Terephthalate (PET)

What Is PET? Lightweight and Durable Thermoplastic Surface for Sandwich Panels

Polyethylene Terephthalate (PET) is a thermoplastic material from the polyester family, used in sandwich panel systems for lightweight, rigid, and moisture-barrier surface applications. Its linear molecular structure results in a semi-crystalline form that enhances mechanical strength.

Due to its polar nature, PET exhibits strong intermolecular bonding, allowing it to retain its shape up to 80°C and resist cracking. Its softening temperature ranges between 70–80°C, while its melting point varies from 235–260°C depending on crystallization.

Despite being very lightweight, PET provides a hard and stable surface finish. Its excellent gas and moisture barrier properties support overall insulation performance. PET surfaces are typically used in thicknesses ranging from 0.60 to 1.00 mm.

PET is commonly preferred in hygienic environments and applications where moisture control is critical. Its chemical resistance and durability reduce maintenance requirements.

With its lightweight structure, dimensional stability, and barrier properties, PET stands out as a functional and modern surface solution for sandwich panel systems.