In the automotive filtration system, the Air Filter plays a crucial role in protecting the engine from dust contamination. One of the most crucial indicators for evaluating the quality of air filters is Filtration Efficiency.
However, what exactly determines the filtration efficiency? And what factors are influencing it? This article will systematically interpret the formation mechanism of the filtration efficiency of air filters from three dimensions: materials, structure and process for you.
The filtration efficiency of an air filter refers to the proportion of impurities such as dust and suspended particles that the filter element intercepts during operation.
For example:
If there are 1000 particles in the air and the filter element blocks 990 of them, then the filtration efficiency is:
99%.
The higher the filtration efficiency, the less dust enters the engine and the longer the engine's lifespan.
What determines the filtration efficiency of an air filter?
The filtration efficiency of air filters is mainly determined by the following five core factors:
This is the most crucial factor influencing efficiency.
The fibers of air filter paper are generally composed of wood pulp, synthetic fibers or nanofibers, and the filtration efficiency depends on:
Fiber diameter
The finer the fiber
The gaps are denser.
The stronger the ability to capture smaller particles
For instance, compared with ordinary filter paper, the efficiency of nanofiber filter paper has been significantly improved.
Fiber density
Also known as "quantitative" or "density value", the higher the density, the lower the probability of dust passing through.
High-quality filter paper has static electricity, which can attract tiny particles and enhance the filtration capacity.
The gram weight and resin content of filter paper
The resin coating on the surface of filter paper can enhance structural strength, while the gram weight and resin content will affect:
Filtration accuracy
Moisture resistance capacity
Folding endurance
Dust adsorption capacity
If the resin content is too low, it is prone to moisture absorption and deformation, and the efficiency will decline
Moderate resin content → ensures a balance between strength and efficiency
Filtration efficiency is not necessarily the higher the better
Although high efficiency represents better filtration capacity, a balance should also be struck between efficiency and air intake volume.
If the filter paper is too dense:
Resistance rises
The intake volume of the engine has decreased
It may affect the power performance
Therefore, different vehicle models and markets will choose different levels of efficiency and resistance combinations.
The efficiency control method of ETTV's air filter elements
As a manufacturer, we ensure the filtration efficiency of our products through the following methods:
High-density and high-efficiency filter paper is adopted
Precisely control the resin content
Use an automatic paper folding machine to ensure consistent folding widths
Structural support is provided by using thickened galvanized steel mesh
Strictly control the quality of PU or rubber seals
Equipped with dedicated filtration efficiency testing equipment (ISO 5011 standard)
Each process determines the final filtration level.
Filtration efficiency is the combined result of materials, structure and process
Filter paper material
Fiber structure
Origami technique
Support stability
Sealing process
Jointly decided.
A high-quality air filter element must ensure high filtration efficiency while taking into account air flow, durability and structural stability.
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.
