At our company, we believe that the quality of an air filter starts from its materials. As a professional automotive air filter manufacturer in China, we carefully select and test every component used in our filters — from the filter paper to the sealing rubber — to ensure long-lasting performance and high filtration efficiency.
The Importance of Quality Raw Materials
An air filter may look simple, but its structure and materials directly determine the filter’s performance. The right combination of filter paper, non-woven fabric, metal mesh, and rubber seals ensures:
Excellent dust-holding capacity
Low airflow resistance
High temperature resistance
Long service life
That’s why material selection is the foundation of every reliable air filter we produce.
High-Efficiency Filter Paper
The filter paper is the heart of every air filter. We use imported high-precision filter paper from trusted suppliers. Each batch is tested for:
Filtration efficiency (removal of particles down to 5 microns)
Air permeability (maintaining sufficient airflow to the engine)
Burst strength and stiffness (to ensure the paper can withstand air pressure)
Our engineers select different types of filter media depending on customer needs — including synthetic fiber paper, blended fiber, and nano-coated paper for enhanced performance.
Non-Woven Fabric and Supporting Layers
In addition to filter paper, we use non-woven fabrics as support layers or pre-filters. This material helps to capture larger dust particles and extend the service life of the main filter media.
The non-woven fabric is made from polypropylene or polyester fibers, treated for:
Uniform thickness
Anti-moisture properties
Heat and oil resistance
This ensures the filter maintains stable performance even in harsh conditions.
Metal Mesh and Frame Materials
For some heavy-duty or commercial vehicle air filters, galvanized or stainless-steel mesh is used to provide additional support and prevent deformation.
We also use environmentally friendly plastic or polyurethane frames that are precisely molded for perfect sealing and stability.
Strict Material Testing and Quality Control
Every batch of raw materials undergoes multiple inspections before production:
Visual and dimensional checks
Filtration efficiency test
Tensile and burst strength test
Temperature and humidity resistance test
We maintain detailed records to ensure full traceability from materials to finished products. This quality control process is one of the reasons our air filters are trusted by customers around the world.
Working with Reliable Suppliers
We cooperate only with certified and well-known material suppliers to guarantee stability in both quality and supply. Long-term partnerships allow us to maintain consistent performance and deliver OEM-standard automotive air filters to our clients in Europe, the Middle East, and South America.
Continuous Improvement
Our R&D team constantly researches new filtration technologies and materials — such as nano-fiber coatings and eco-friendly filter papers — to enhance efficiency while reducing environmental impact. We believe innovation is the key to keeping our air filters ahead of market trends.
The role of a car air filter is of vital importance. It can effectively filter out dust and impurities in the air, ensuring that the air entering the engine is pure and guaranteeing the normal operation of the engine. On the one hand, it can make the fuel burn fully and improve the engine efficiency, just like providing a clean "breathing" environment for the engine. On the other hand, it can prevent foreign objects from entering the cylinder, reduce wear on the cylinder wall, piston and other components, and extend the service life of the engine. At the same time, it is also helpful for keeping the air inside the vehicle fresh and enhancing driving safety. The air filter is like a "mask" for a car engine, blocking dust and impurities from the outside for the engine.
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.
