GL18, Tamper Evident, White, PP, Self Seal Closure

The GL18 White Tamper-Evident Self-Seal Closure in PP (GL18TEWPP-SSC) is a polypropylene screw cap combining a tamper-evident ring with an integrated self-seal membrane in a single GL18 assembly. Manufactured entirely in PP, the tamper-evident ring is produced separately from the cap body and assembled together — delivering a more reliable and visually distinct tamper-evidence function than a single-piece integral moulding, making it the preferred TE self-seal configuration for pharmaceutical, regulated healthcare, and clinical-grade personal care applications where the quality and clarity of the tamper-evidence mechanism is a specification requirement rather than simply a commercial expectation. When the cap is opened for the first time, the assembled TE ring separates cleanly from the cap body and remains on the bottle neck, providing unambiguous visible evidence of first access. The integrated self-seal membrane creates a hermetic seal against the glass bottle rim without a separate liner insert, maintaining formulation integrity throughout the supply chain and in consumer use.

The GL18TEWPP-SSC occupies a specific and important position in the GL18 tamper-evident closure family: it provides the more robust assembled TE ring construction in PP, compared to the GL18TEW-SSC which uses a PEHD cap body with an integral moulded TE ring. For regulated pharmaceutical applications where the tamper-evidence mechanism must meet a higher standard of reliability and visual clarity, the assembled PP construction is typically the preferred specification. As part of the GL18 system (also known as NW18 or DIN168), this closure is fully interchangeable across all GL18 glass dropper bottles in the BlueSky range — 5ml to 100ml, in both amber and clear glass — without any change in closure specification. Contact BlueSky to confirm stock availability, MOQ, and TE ring type before specifying.