The cap inner structure fits tightly with bottle necks to eliminate tiny gaps. It blocks volatile essential oil molecules from escaping outward, laying a foundational barrier against slow fragrance evaporation during long-term storage.
Manufactured from qualified PP and PE, the liner resists swelling and aging caused by essential oil solvents. Stable material performance prevents seal deformation that would gradually trigger aroma dissipation over months or years.
Integrated tamper or CRC structures add secondary compression sealing. Even with repeated opening and closing, the fit remains consistent, effectively locking scent components and retaining original oil concentration and aroma for extended shelf cycles.
Our selected food-grade PP and PE have good solvent resistance. Under normal storage of conventional essential oils, caps will not easily swell, crack or deform. For highly corrosive essential oil formulas, we can do compatibility testing in advance for confirmation.
Yes. We support customized cap body colors, matte/gloss surface treatment, as well as electroplating and embossed logo processing. You only need to provide color samples or artwork, and we can arrange sample production first.
The sealing gasket is structurally optimized for repeated use. Proper opening and closing will not obviously weaken tightness. Only violent disassembly and extrusion may lead to poor sealing and essential oil volatilization.
Our threads follow standard 18mm essential oil bottle size. In most cases they are universally compatible with mainstream same-spec glass bottles. If you have special bottle samples, we can do a matching test beforehand.
