Performance comparison of polyester, aramid, and PTFE coated dust collector filter media

I. Introduction The core performance of dust collector filter cartridges is determined by the filter media material, with three main types commonly used: polyester (PET), aramid (Metal-Oxide), and PTFE membrane. These three materials differ significantly in temperature resistance, filtration accuracy, dust removal performance, corrosion resistance, cost, and applicable operating conditions. This article compares them item by item based on key performance characteristics, clearly distinguishing the selection criteria and application scenarios.
II. Basic Definitions of Three Major Filter Media

Polyester (PET) Filter Media

Ordinary polyester nonwoven fabric, a general-purpose base filter media for industrial room temperature dust removal, offering high cost-effectiveness and good wrinkle retention.

Aramid Filter Media (Meta-aramid/Meso-aramid)

Special synthetic fiber for medium and high temperatures, with strong thermal stability, no shrinkage, and resistance to folding and abrasion, making it the standard for high-temperature dust removal.

PTFE Membrane Filter Media

A layer of polytetrafluoroethylene microporous membrane is laminated onto the surface of the polyester/aramid base fabric, achieving surface filtration, anti-sticking, self-cleaning, and high precision.
III. Comparison of Core Performance Aspects

1. Temperature Resistance

Polyester (PET): Continuous temperature resistance ≤130℃, instantaneous 150℃; prone to shrinkage, caking, and hardening at excessive temperatures.

Aramid (Meta-aramid): Continuous 180～200℃, instantaneous 220℃; no deformation during long-term operation at medium and high temperatures.

PTFE Coating: Membrane temperature resistance 260℃; substrate depends on the base material; polyester-based coatings have a temperature resistance of 130℃, while aramid-based coatings can reach over 180℃.

2. Filtration Principle and Precision

Polyester: Deep filtration; dust easily penetrates the fiber interior; standard precision 1–10μm; fine dust easily penetrates, and resistance increases rapidly over time.

Aramid: Primarily deep filtration; dense fibers; precision superior to ordinary polyester, but fine dust still has embedding issues.

PTFE membrane: Surface filtration with dense and uniform micropores, dust remains only on the surface; filtration accuracy up to 0.3μm, strong interception of ultrafine dust, preventing dust embedding.

3. Self-cleaning performance.
Polyester: Dust embeds in the fibers, making it difficult to clean thoroughly with pulse cleaning. It easily clumps and clogs, leading to rapid lifespan reduction.

Aramid: Slightly better than polyester, but still prone to deep dust embedding; sticky dust easily clogs the cartridge.

PTFE Coating: Smooth surface, non-sticky, easy to clean with low pressure, stable resistance, and significantly extended service life.

4. Corrosion, Acid & Alkali, and Moisture Resistance

Polyester: Resistant to general dry dust, but not resistant to acids, alkalis, or hydrolysis. Prone to rotting and strength reduction in humid environments.

Aramid: Moderate chemical resistance, resistant to weak acids and alkalis, and has better hydrolysis resistance than polyester. Suitable for high-temperature and humid flue gas.

PTFE Coating: Strongly corrosion-resistant, acid and alkali-resistant, hydrophobic and non-sticky, suitable for humid, sticky, and corrosive dust conditions.

5. Abrasion Resistance and Mechanical Strength

Polyester: Good toughness, easy to wrinkle and shape, sufficient abrasion resistance at room temperature.

Aramid: High strength, resistant to bending and tensile stress, not easily brittle at high temperatures, and has strong mechanical stability.

PTFE coating: The film layer is thin and susceptible to sharp scratches; the strength of the substrate depends on the base fabric; overall abrasion resistance is not as good as aramid.
6. Flame Retardant and Antistatic Properties

Polyester can be modified for flame retardancy and antistatic properties, but it is still prone to aging at high temperatures.

Aramid is inherently flame retardant and non-self-igniting, suitable for environments with sparks and high-temperature fumes.

PTFE is inherently flame retardant and highly inert, making it suitable for explosion-proof and corrosion-resistant applications.

7. Price and Cost

Polyester: High cost-performance ratio, low production cost, general-purpose and widely used.

Aramid: Mid-to-high range, more expensive than polyester, essential for high-temperature applications.

PTFE Coating: Higher price, but longer lifespan and less frequent replacement, resulting in lower overall operating costs.
IV. Comparison Table of Applicable Working Conditions for the Three Major Filter Media

Polyester (PET) Applicable: Woodworking, mining, sandblasting, shot blasting, room temperature powder, dry and non-corrosive, general working conditions without high temperatures.

Aramid (Metal-Oxide) Applicable: Metallurgical welding, casting heat treatment, asphalt mixing, kiln flue gas, medium to high temperature working conditions (130–200℃), sparking dust.

PTFE (Membrane) Applicable: Moist and sticky dust, ultrafine welding fumes, chemical corrosive dust, ultra-low emissions, prone to clogging and sealing, requiring long-term low-resistance working conditions.