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- Standard / CETIE-GUIDE-18
CETIE Guide 18
CETIE Guide 18
CETIE Guide 18 is a voluntary industry guideline published by CETIE — the International Technical Centre for Bottling and Related Packaging — that provides a structured collection of test methods for the qualification of plastic flat-top closures applied to PET bottles used across the beverage industry. Developed by technical experts drawn from across the global bottling and packaging supply chain, this guide aims to harmonize measurement practices, ensuring that all parties involved in closure evaluation—from closure manufacturers to bottlers and quality laboratories—obtain consistent, comparable results. Presto, a trusted manufacturer of precision testing and quality control instruments, offers torque and force testing solutions well-suited to fulfilling the requirements outlined in CETIE Guide 18.
Significance
Plastic flat-top closures are the primary sealing interface between a beverage and its consumer. Their mechanical performance directly governs product shelf life, tamper evidence integrity, and consumer usability. CETIE Guide 18 establishes a common technical language and a shared set of evaluation criteria that enable closure suppliers and beverage manufacturers to collaborate effectively on closure qualification, reducing variability, minimising field failures, and ensuring that closures perform reliably across the full range of filling, capping, distribution, and end-user conditions encountered in real-world beverage production environments. CETIE Guide 18 encompasses four key test methods for the qualification of plastic flat-top closures on PET bottles: Removal Torque—measuring the rotational force required to open the closure; Tamper-Evident Band Break by Torque—evaluating the force at which the tamper-evident ring separates during opening; Strip Torque—determining the torque at which thread engagement fails; and Tamper-Evident Band Separation by Tension—assessing the tensile force required to detach the tamper-evident band from the cap body. Together, these methods provide a comprehensive mechanical characterization of closure performance from application through to end-use.Scope