What are the main applications for PPS/PTFE Blended Coated Filter Bags?

PPS/PTFE Blended Coated Filter Bags are primarily used in industries where high-temperature and chemically aggressive filtration is required. Common applications include chemical processing, where they filter out particulates from chemical reactions, and in the pharmaceutical industry for filtering solutions and suspensions. They are also used in the food and beverage industry for filtering high-temperature processes to ensure product quality and safety.

How do I determine the correct size for my filter housing?

To determine the correct size of PPS/PTFE Blended Coated Filter Bags for your filter housing, you should consider the dimensions of your housing and the flow rate requirements. Our filter bags are available in standard sizes, but we also offer customization services to ensure a perfect fit. It's important to match the filter bag size with the housing to prevent leaks and ensure optimal filtration performance.

How often should I replace the filter bags?

The replacement frequency of PPS/PTFE Blended Coated Filter Bags depends on the specific application and the level of contamination in the fluid being filtered. Generally, it is recommended to monitor the pressure drop across the filter bags as an indicator of when they need to be replaced. A significant increase in pressure drop suggests that the bags are clogged and need更换. Regular inspection and maintenance are also crucial to prolong the life of the filter bags and maintain efficient filtration.

PPS/PTFE Blended Coated Filter Bags

High-Performance Filtration for Industrial Applications

This product is primarily suitable for applications involving high-temperature, sulfur-containing flue gas and dust control in sectors such as coal-fired boilers, waste incineration, biomass power generation, metallurgy, chemical processing, and cement production, where there is a risk of oxidative corrosion.

Customization Service:

Specifications and dimensions can be customized according to customer requirements.

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PPS/PTFE Blended Coated Filter Bags Overview

PPS/PTFE blended membrane filter bags use a 50:50 blend of PPS (polyphenylene sulfide) and PTFE (polytetrafluoroethylene) fibers in a needle-punched felt as the base material, with PTFE fibers serving as the reinforcing base fabric. This effectively combines PPS’s resistance to acids and alkalis, hydrolysis, and abrasion with PTFE’s excellent chemical stability and oxidation resistance, while the PTFE microporous membrane coating ensures highly efficient surface filtration and easy dust removal.

This product can operate continuously at temperatures ranging from 160 to 190°C and withstand instantaneous temperatures of up to 210–220°C. It maintains stable operation in flue gas environments with oxygen content below 15–16% and exhibits excellent resistance to acid and alkali corrosion across a pH range of 1 to 14.

Its blended design addresses the shortcomings of pure PPS filter media in terms of oxidation resistance, significantly extending the service life of the filter bags under complex operating conditions. Research indicates that when used in coal-fired power plants, it can achieve ultra-low emissions (<10 mg/m³) and ensure long-term stable operation.

Optimal Base Fabric: Pure PTFE woven base fabric + Surface Layer Fibers: PPS + PTFE fiber blend (50% PPS + 50% PTFE) + Outer Layer: Thermally laminated PTFE microporous film—specifically designed to address the pain points of pure PPS, such as susceptibility to oxidation and hydrolysis failure

Significantly improves the two major shortcomings of pure PPS

The major drawbacks of pure PPS: susceptibility to oxidation in high-oxygen environments and to hydrolysis at high temperatures and humidity. After blending with PTFE fibers: oxidation resistance improves by over 40%, significantly slowing the aging rate under conditions with high O₂ content in flue gas; resistance to hydrolysis and weak acid corrosion is comprehensively enhanced; service life in wet flue gas environments containing SO₂ and HCl is notably longer than that of ordinary pure PPS membrane-coated filters.

Balanced Chemical Stability

PPS offers excellent mechanical strength and cost-effectiveness; PTFE fibers inherently possess extremely strong corrosion resistance and low adhesion properties; capable of withstanding medium-concentration acidic flue gas and weakly alkaline dust.

Unified Advantages of PTFE Coating

Surface filtration achieves a dust removal efficiency of ≥99.99% for particles ≥0.3 μm, with stable ultra-low emissions of ≤5 mg/Nm³; dust remains only on the outer surface of the membrane, ensuring thorough pulse cleaning, long-term stable pressure drop, and reduced risk of dust embedding or bag clogging.

Improved Dust Release Properties

The combination of PTFE fibers and a surface coating provides dual low surface energy, making it less prone to caking and bag clogging caused by sticky dust and ammonium salt dust compared to pure PPS-coated filter media.

Cost-Effective Compromise Solution

Priced higher than pure PPS-coated filter media but significantly lower than all-PTFE filter media; suitable for projects with limited budgets but highly corrosive operating conditions where pure PPS filter media would have an insufficient service life.

Key Technical Features of PPS/PTFE Blended Coated Filter Bags

STEP 1

High-Temperature Resistance

These filter bags are capable of withstanding temperatures up to 240°C, making them suitable for high-temperature filtration processes without risk of material degradation.

STEP 2

Chemical Resistance

Resistant to a wide range of chemicals, including most acids and alkalis, these bags maintain their structural integrity in chemically aggressive environments.

STEP 3

High Filtration Efficiency

Achieving 99.9% filtration efficiency at 0.3 microns, these bags ensure that particulate matter is effectively removed, protecting downstream processes and products.

STEP 4