As a key component of cosmetic packaging, the sealing performance of cosmetic pumps has an important impact on the overall quality, user experience and consumer satisfaction of the product. Therefore, in order to ensure the sealing performance of cosmetic pumps during actual use, a series of rigorous sealing performance tests must be carried out.

Importance of sealing performance
Sealing performance plays a vital role in the application of cosmetic pumps, which is mainly reflected in the following aspects:
Prevent leakage: Excellent sealing performance can effectively prevent cosmetics from leaking during storage and use, thereby avoiding material waste and environmental pollution.
Maintain product stability: Sealing performance directly affects the stability and effectiveness of cosmetics, and can effectively prevent the intrusion of air, moisture and pollutants, thereby extending the shelf life of the product.
Improve user experience: During the use of cosmetics, good sealing performance can provide consumers with a smoother use experience and avoid the inconvenience caused by leakage or blockage of the pump body.

Sealing performance test method
In order to ensure the sealing performance of cosmetic pumps, the industry usually uses the following test methods:

Air tightness test
Air tightness test is a method to evaluate whether the pump body can effectively prevent gas leakage. The main steps include:
Equipment preparation: Use an air tightness test instrument to test the sealing performance of the pump by applying a certain air pressure.
Apply air pressure: Place the pump body in the air tightness test equipment and apply air pressure that is usually 0.5-1.5 times the working pressure.
Observe leakage: Observe whether there is gas leakage in the pump body within the set time. If the air pressure drops by more than the set value, it indicates that there is a leak.
The air tightness test can effectively evaluate the sealing ability of the pump body under high pressure environment and is suitable for many types of cosmetic pumps.

Liquid tightness test
The liquid tightness test is mainly used to evaluate the sealing performance of the pump in a liquid environment, especially for liquid cosmetics. The test steps are as follows:
Filling liquid: Fill the pump body with a specific test liquid, usually a liquid similar to the cosmetic ingredients.
Standing observation: After the filling is completed, the pump body is left to stand for a period of time to observe whether there is liquid leakage.
Pressure test: In some cases, a certain external pressure can also be applied to observe the sealing performance of the pump body under pressure.
The liquid tightness test can simulate the actual use situation and ensure the reliability of the pump body in a liquid environment.

Pressure test
The pressure test is an important method to evaluate the sealing performance and structural integrity of the pump body under high pressure conditions. Its main steps include:
Equipment preparation: Use a dedicated pressure test equipment, usually with an adjustable pressure range.
Apply pressure: Place the pump body in the test equipment and gradually increase the applied pressure until the set maximum working pressure is reached.
Observe deformation and leakage: During the pressure application process, observe whether the pump body is deformed, leaking or otherwise damaged.
The pressure test can effectively evaluate the performance of the pump body under extreme conditions and ensure its safety in actual use.

Temperature cycle test
The temperature cycle test is used to evaluate the sealing performance of the pump body under different temperature conditions. By heating and cooling the pump body multiple times, its sealing ability and structural stability under temperature changes are observed. This test can simulate the actual use of cosmetics under different environmental conditions and ensure that the product maintains a good sealing effect in a variable temperature environment.