Spray pumps play a vital role in the packaging of cosmetics, personal care products and other liquid products. The quality of their design directly affects the user experience and the market competitiveness of the product. In the design process of the spray pump, the rationality of the sealing structure is one of the core elements to achieve the anti-leakage function. High-quality sealing design can not only effectively prevent liquid leakage, but also ensure the stability and reliability of the spray pump during use.

Selection of sealing materials
The sealing material is a key component of the sealing structure, and its selection has a direct impact on the sealing performance of the spray pump. Common sealing materials include rubber, silicone and various plastics. Choosing the right sealing material is the basis for ensuring the performance of the spray pump. The following are several important considerations:
Chemical resistance: Spray pumps are usually used to store a variety of cosmetics and liquids, and the chemical composition of these liquids may vary. Therefore, the sealing material must have excellent chemical resistance to prevent reactions with the internal liquid, causing the material to age or lose elasticity. For example, fluororubber and silicone are outstanding in chemical stability and are suitable for high-demand spray pump sealing structures.
Elasticity and recovery: The elasticity and recovery of the sealing material are important indicators of its performance after being compressed. During the operation of the spray pump, the sealing material must be able to recover to its original shape after being pressurized to ensure the durability of the sealing effect. Highly elastic materials can effectively reduce the risk of leakage caused by pressure changes during use.

Design of sealing structure
The design of the sealing structure has a direct impact on the leak-proof performance of the spray pump. The following aspects need to be considered during the design:
O-ring and gasket: O-ring is one of the commonly used sealing elements in the spray pump. Placing the O-ring between the pump body and the bottle mouth can effectively prevent liquid from leaking from the joint. During the design process, it is necessary to ensure that the size and material selection of the O-ring match the working pressure of the spray pump to avoid sealing failure caused by excessive pressure.
Threaded connection: The bottle mouth and pump body of the spray pump are usually connected by threads. The thread design should ensure a close fit between the two to avoid gaps caused by improper assembly. The depth, angle and surface smoothness of the thread must be precisely designed to achieve the best sealing effect.
Pressure relief valve: In the design of the spray pump, the integrated pressure relief valve can effectively prevent leakage caused by excessive air pressure. The valve will automatically release gas when the internal pressure exceeds the set threshold, thereby maintaining a stable internal pressure and reducing the risk of leakage.