PET (polyethylene terephthalate) and OPP (oriented polypropylene) are the two most common substrates for metalized films. Each has distinct strengths — and the right choice depends on your application, converting process and budget.
PET — The Premium Performer
PET offers higher tensile strength, better temperature resistance and superior optical clarity. It is the substrate of choice for premium lamination, hot-fill applications and high-temperature converting processes.
OPP — The Cost-Effective Workhorse
OPP delivers comparable barrier performance at lower cost and lower density. It is widely used in flexible packaging, labelstock and overwraps where cost-efficiency matters.
Quick Comparison
- Strength: PET > OPP
- Temperature: PET (up to 200°C) > OPP (up to 130°C)
- Clarity: PET > OPP
- Cost: OPP < PET
For most premium lamination and high-temperature applications, PET is the right answer. For high-volume packaging and labelstock, OPP delivers unbeatable cost-performance.