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China Synthetic Fiber Medium Pocket Filter Suppliers - EN 779 Standard Factory Efficiency 45%-95%

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High-Quality Air Filters from China Suppliers and Factory

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Our air filters are expertly crafted using premium materials, including aluminum sheets and galvanized steel sheets, ensuring durability and efficiency. Available in various thicknesses of 21mm, 25mm, and 46mm, our filters meet diverse filtration needs.

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Featuring synthetic fiber media, these filters offer remarkable efficiency rates of 45% to 95% at 0.5μm, making them ideal for various industrial applications.

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Compliant with EN 779 standards, our filters range from M5 to F9 classifications, guaranteeing superior performance. Designed to operate under challenging conditions, they can withstand temperatures up to 90℃ and humidity levels up to 90% RH.

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Choose our high-performance air filters, sourced directly from reliable China suppliers and manufacturers, to enhance your air quality and operational efficiency.

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    Contact us
    Product Details

    ◉ Application Area
    Pocket filters are widely used in central air conditioning ventilation systems, pharmaceutical, hospital, electronics, food and other industrial applications, and can also serve as the medium filter for high-efficiency air filters.
    ◉ Filter Media Materials

    This is the key component that determines filtration efficiency, primarily made from synthetic chemical fibers.

    Main Types

    🔸 Synthetic Fiber
    The most commonly used and mainstream material. Offers good strength, stable performance, and high cost-effectiveness.
    🔸 Polypropylene Fiber
    Possesses good chemical corrosion resistance, remains stable especially in humid environments, and is not prone to mold.

    Material Form and Manufacturing Process

    Non-woven Fabric: The vast majority of synthetic fiber bag filters utilize the non-woven fabric process. Fibers are randomly interlocked through methods like needle punching, melt blowing, or spun bonding, forming a three-dimensional web of varying depth.

    Structural Characteristics: This disordered structure creates countless curved, intricate micron-sized channels that capture particulate matter through the following mechanisms:

    • 1Interception Effect: Particles are directly trapped on the fibers.
    • 2Inertial Impact: Larger particles deviate from the air streamlines due to inertia and collide with the fibers.
    • 3Diffusion Effect: Very small particles randomly collide with fibers due to Brownian motion.
    • 4Electrostatic Effect: Some synthetic filter media carry an electrostatic charge, which enhances the adsorption capacity for fine particles.

    Support and Structural Frame Materials

    To enable the soft filter media to function stably, the following structural materials are required:

    Bag Support Frame: Inside each filter bag, there is typically a V-shaped or U-shaped support frame made of galvanized steel wire or plastic.

    Function: Prevents the filter from collapsing under airflow during operation, ensuring each filter bag remains fully expanded. This guarantees maximum effective filtration area and lower system resistance.

    Frame Materials

    🔸 Galvanized Steel Sheet
    The most common choice, offering good strength and low cost, meeting the requirements for most air handling units.
    🔸 Aluminum Profile
    Lighter in weight with good corrosion resistance, often used in weight-sensitive applications or special environments.
    EN 779 Synthetic Fiber Medium Pocket Filter (1)EN 779 Synthetic Fiber Medium Pocket Filter (1)
    ◉ The Efficiency of Pocket Filter
    The efficiency of pocket filters ranges from 45% to 95%, and they can be selected based on specific requirements. The rational selection of filter efficiency and face velocity contributes to comprehensive economic benefits.

    For filters made of the same material, higher efficiency typically results in greater resistance and higher cost, while lower efficiency leads to reduced resistance and cost. Altering the air velocity will also affect resistance, efficiency, and the number of filters required, so appropriate selection should be made according to specific conditions.

    EN 779 Synthetic Fiber Medium Pocket Filter (2)EN 779 Synthetic Fiber Medium Pocket Filter (3)
    ◉ Service Life of Filters

    As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced.

    📌 The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.
    ◉ Wind Velocity Relationship Diagram
    Wind Velocity Relationship Diagram (1)
    ◉ Product Parameters
    Wind Velocity Relationship Diagram (2)
    📌 Remarks: (1) Initial resistance tolerance of ±10%    (2) Support customer size
    ❓ Frequently Asked Questions
    Q What industries are pocket filters commonly used in?
    Pocket filters are widely applied in central air conditioning ventilation systems across numerous industries, including pharmaceutical, hospital, electronics, and food processing. They are also used as medium-stage filters upstream of high-efficiency (HEPA) filtration systems.
    Q What filter efficiency levels are available for pocket filters?
    The efficiency of pocket filters ranges from 45% to 95%. The appropriate efficiency level should be selected based on specific application requirements, considering the balance between filtration performance, airflow resistance, and overall cost.
    Q What materials are used in the filter media of pocket filters?
    The filter media is primarily made from synthetic chemical fibers, with synthetic fiber and polypropylene fiber being the two main types. These are typically manufactured using non-woven fabric processes such as needle punching, melt blowing, or spun bonding to create a deep, three-dimensional filtration structure.
    Q How does air velocity affect the performance of a pocket filter?
    Higher air velocity increases the resistance (pressure drop) across the filter and can affect filtration efficiency. By increasing the filter media surface area, the velocity of air passing through is reduced, which helps lower resistance and extend filter service life. Proper face velocity selection is essential for achieving the best economic and performance outcomes.
    Q When should a pocket filter be replaced?
    A pocket filter should be replaced when the accumulated dust causes the resistance to rise to an unacceptable level. Additionally, if excessive resistance causes previously captured dust particles to become dislodged and re-enter the airflow, the filter must be replaced immediately to maintain air quality and system performance.
    Q What frame materials are used to support the pocket filter bags?
    The most common frame materials are galvanized steel sheet and aluminum profiles. Galvanized steel offers good strength and low cost, making it suitable for most air handling units. Aluminum profiles are lighter and more corrosion-resistant, ideal for weight-sensitive or special environmental applications. Inside each bag, V-shaped or U-shaped support frames keep the filter fully expanded during operation.