In the design and manufacture of automotive filters, sealing performance is as important as filtration efficiency. Apart from the quality of the filter paper itself, the design of the edge structure of the filter will also directly affect its usage effect. Among them, the structure of "three sides surrounded by sponge" is precisely a key process that has been adopted by an increasing number of high-quality filters in recent years.
The so-called "three-sided surrounding sponge" refers to the use of highly elastic sponge materials to cover or adhere to the three edges of the filter, so that when the filter element is installed into the air filter box or air conditioning filter box, a better sealing structure can be formed. This design is commonly found in air filters and air conditioning filters, especially in original factory standard or high-end alternative market products.
1️ ️ enhance sealing performance to prevent air leakage
If traditional filters are installed only by relying on hard plastic edges or paper edges, tiny gaps may occur inside the filter box. The three-sided surrounding sponge can closely adhere to the inner wall of the filter box after installation, preventing unfiltered air from bypassing the filter element and directly entering the engine or cabin, thereby enhancing the overall filtration effect.
2️ ️ reduce vibration and noise
During vehicle operation, the filter is subject to engine vibration and airflow impact. Sponge material has excellent buffering performance, which can reduce the vibration of the filter element inside the filter box, lower abnormal noise and enhance driving comfort.
3️ ️ extend the service life of the filter
Good sealing can reduce the direct impact of dust particles on the edge of the filter element, prevent local wear or damage, thereby extending the service life of the filter and reducing the frequency of replacement.
Adapt to more vehicle models and enhance versatility
There are subtle differences in the filter box structure among different vehicle models. The three-sided surrounding sponge has a certain degree of elasticity, which can better adapt to installation grooves of different sizes, improve the product's compatibility and installation success rate, and reduce customer complaints.
Material requirements for three-sided sponge
High-quality filters typically use the following sponge materials:
High-density polyurethane Foam (PU Foam
High-temperature resistant and aging-resistant
It is not prone to deformation or chipping
It has good resilience
These features ensure that the filter maintains a stable sealing effect over long-term use.
The three-sided surrounding sponge is not an "redundant design", but an important structural optimization to enhance the overall performance of the filter. It not only improves the sealing performance, but also enhances the stability, durability and user experience of the product, making it an indispensable part of modern high-quality automotive filters.
Qinghe County Dongsen Auto Parts Co., Ltd. is located in Qinghe County, Xingtai City, Hebei Province. It was established in 2024. Although the company was established a short time ago, it has more than 10 years of production experience. We are a manufacturer specializing in the production of air filters, air conditioning filters and oil filters. The filters produced by our factory serve the domestic and foreign markets and have won unanimous praise from customers in Southeast Asia, Africa, South America and other regions.
