Airtight principle of bottom refill bottles

The excellent airtight performance of bottom refill perfume bottles comes from the multi-layer sealing structure and precision mechanical valve technology developed by our factory, realizing zero air leakage and zero liquid leakage for a long time. First, the core bottom filling port is equipped with a high-elasticity food-grade silicone one-way sealing valve, which has ultra-high fitting precision and can achieve seamless closure after filling, blocking air and liquid backflow. Second, the bottle body and the aluminum shell are assembled with high-density embedded technology, equipped with annular sealing gaskets at all assembly gaps to eliminate tiny gaps. Third, the nozzle part adopts a professional spray pump core with built-in airtight locking structure, which can keep the pipeline closed when not in use and prevent fragrance volatilization and air penetration. Fourth, the integral glass bottle cavity has no cracks or gaps, with stable physical and chemical properties, providing a reliable closed storage space. This multi-dimensional sealing system enables the bottle to maintain a long-term vacuum sterile state inside. Whether it is daily static placement, high-temperature environment storage or vibration during transportation, it can still maintain stable airtight performance, effectively prevent perfume oxidation and liquid leakage, and solve the most common quality pain points of traditional sub-bottles for perfume brands.