Basalt Fiber Needled Felt Filter Bag
Continuous working temperature 600℃ (1112℉), short time up to 1000℃ (1832℉)
Resistant to chemical corrosion, hydrolysis and oxidation
From nature, non-toxic during life cycle, more environmentally friendly
Adaptable to high-pressure pulse jet cleaning
Low-pressure drop and low energy consumption
Prevents condensation, easy cleaning
Low emission <30mg/Nm3 (ePTFE membrane <5mg/Nm3@<260℃/500℉, nano coating <5mg /Nm3@>260℃/500℉)
What is a High Temperature Filter Bag?
High-temperature filter bag is the core component of high-temperature flue gas bag-type dust collector, specially designed to cope with high temperature, corrosion and high dust load, to ensure the stable system operation and meet the emission regulations. High temperature is a less precise fuzzy, generic industry description without any mandatory or strict standards or definitions.
Instead of defining a filter bag by a single temperature index, FiltEdge uses long term service temperatures and short time temperatures to more accurately match your filter bag working environment based on dust properties, corrosive components, and other actual operating conditions and industry consensus. We call them high temperature filter bags when the long term service temperature is >160°C (320°F) and the peak temperature does not exceed 300°C (572°F) in most operations.
High Temperature Filter Bags by Media
Depending on organic fibers, inorganic fibers, and their combined composite processing technologies, FiltEdge offers a wide range of proven high temperature filter bags by filter media types to meet your complex environmental challenges, listed as just a few, and can be custom developed for special needs.
Typical Application Industries for FiltEdge High Temperature Filter Bags
Whether you are replacing old filter bags or selecting filter bags for a new project, common high-temperature filter bags application scenarios can help you quickly determine your needs. However, due to the vastly different working conditions and environments in different industries and processes, the understanding of high temperature also varies. Complexity is the norm, and risks are inevitable. FiltEdge technical experts will help you conduct an in-depth system assessment to avoid losses.
Power Industry: Flue Gas Purification for Coal-fired Power Plant BoilersResistant to corrosion from acidic gases (SO₂, HCl) produced by the combustion of high-sulfur coal;High filtration efficiency, emission can be controlled below 5mg/m³.
Iron and Steel Metallurgy (Sintering, Converter, Electric Furnace)Strong resistance to metal oxide dust erosion, with a dust removal rate >99%; Temperature resistance meets the demand of 180–240℃ operating conditions.
Cement industry: Kiln Head and Kiln Tail SystemAdaptable to high dust load, strong corrosion resistance;
Good water repellency, not easy to condense, adaptable to humid working conditions.
Waste Incineration Industry: High-Temperature Corrosive Flue Gas FiltrationResistant to highly corrosive flue gas containing HCl and SO₂ at 220–260℃;
When combined with activated carbon, it can effectively capture harmful substances such as dioxins.
Chemical Industry: High-Risk and Complex Working ConditionsGood chemical stability, acid and alkali corrosion resistance;
Resist condensation and cope with high humidity environment;Sticky flammable and explosive flue gas dust;
Ceramic and Glass FurnacesHighly abrasive, low particle size, high dust loads
Fluctuating co-existence of high humidity and severe environmental corrosion
Key Features of FiltEdge High Temperature Filter Bags
Although high-temperature filter bags are still filter bags with many of the characteristics of regular filter bags, due to the complexity of their application and the accelerating effects of high temperatures, FiltEdge uses proprietary technology to ensure that you are not only compliant with emission regulations, but also achieve better operation, maintenance and economic benefits.
Long term service temperature 160°C (320°F) – 600°C (1112°F), with peak temperature limitation 1000°C (1832°F)
When the temperature exceeds 300°C (572°F), ordinary sewing threads are completely ineffective, and FiltEdge special treated stainless steel, alloy, or basalt fiber sewing threads must be used.
When the temperature exceeds 300°C (572°F), all ordinary ePTFE membrane fails and surface nano-coating technology must be used
Achieves low resistance and high permeability, reduces energy consumption, and extends service life, achieving <20mg/Nm3 emissions without membrane.
Under strong corrosion conditions, ordinary carbon steel spring snap band has long been damaged, stainless steel support time is also limited, special treatment of stainless steel, or even alloy snap band is preferred.
Proprietary high-temperature and corrosion-resistant formulation treatment agent impregnation or coating technology.
Resists the effects of condensation caused by temperature fluctuations by enhancing water-repellent properties through membranes and specialized coatings.
FiltEdge flap double-layer locking seam reinforcement prevents the middle seam from collapsing, and prioritizes the use of needled felt to reinforce the header and the bottom scuff, which provides better wear resistance and sealing performance.
Why do High Temperatures Have a Far Greater Impact on the Service Life and Performance of Filter Bags than Medium or Normal Temperatures?
While high-temperature filter bags are superficially defined by temperature, their service life and performance are actually more significantly affected by the complex working conditions, including factors like chemical corrosion, oxidation, and moisture. The Arrhenius equation tells us that increased temperature dramatically accelerates chemical reactions, generally doubling the rate for every 10-degree Celsius increase. This accelerates chemical corrosion and thermal aging of the filter bag, leading to premature failure. Therefore, high-temperature environments are not simply a matter of slightly higher temperatures affecting the filter bag; rather, they involve a comprehensive and accelerated process of damage. Selecting high-temperature filter bags solely based on temperature specifications carries enormous risks. FiltEdge, with years of extensive practical experience, comprehensively assesses the properties of flue gas and dust under various working conditions and incorporates multiple advanced filter bag and cage manufacturing technologies to ensure worry-free use.
What Defines a Good High-Temperature Filter Bag?
Generally speaking, the filter bag that meets the working conditions is a qualified filter bag, but it doesn’t mean that it is the best or the most suitable one. Simple standard high-temperature filter bags often lead to a lot of subsequent trouble, FiltEdge always adheres to the principle of comprehensive evaluation based on specific operating conditions, maximizing the fit to your project’s actual needs.Wrong selection can lead to catastrophic failure to meet environmental regulations or premature failure; improper selection can leave you with unstable operations, unexpected downtime, frequent maintenance, and increased overall costs.
Basic Requirements – Compliant Emissions
- Stable Operation
- Low Energy Consumption
- Long Service Life
- Easy Installation, Easy/Maintenance Free
- Performance Fit – Neither Excessive nor Insufficient
- Lowest Total Life Cycle Cost
How does FiltEdge Achieve Optimal Performance for High-Temperature Filter Bags?
- Original fiber combination technology from major manufacturers – the foundation of everything
- In-house developed post-treatment formulations and processes – providing extra protection and performance
- Gradient filter media design for low emissions, low resistance, and high permeability – reducing energy consumption and extending service life
- Ultra-low emission technologies – exceeding environmental regulations, and fulfilling greater social responsibility
- Sealing technology – achieving zero leakage
- Reinforcement technology – providing an extra layer of protection for vulnerable areas
- Corrosion resistance technology – stainless steel/alloy spring snap bands, PTFE stitching/laminating/coating/dipping
- Anti-condensation technology
- Cage compatibility – galvanizing, silicone spraying coating, stainless steel, electrolytic polishing
Why Choose FiltEdge for High Temperature Filter Bags?
With over 20 years of filtration experience and technology, along with integrated manufacturing and external sourcing capabilities, FiltEdge delivers more than 1 million filter bags annually to over 50 countries/regions, ensuring 100% compatibility. Whether you are looking for standard filter bag replacements, new filter bag options, or entirely new design, FiltEdge is capable of quickly meeting your needs with model selection, free sampling or design optimization based on your specific conditions, guarantees a long-term stable supply, and eliminate your supply chain anxieties.
One-Stop Filtration Sourcing Capability
Combined in-house manufacturing with mature external sourcing help you avoid compatibility issues, repeated communication, unclear responsibility and hidden system risks.
Given the complex and harsh operating conditions in the high-temperature filtration industry, FiltEdge always adheres to the principle of application-oriented selection, combining extensive global application experience to ensure longer service life, lower total life cycle costs, and stable operation with emission compliance.
Multiple state-of-the-art European-imported roll felt production lines, automated sewing/thermal bonding lines, and a large number of specialty single-person machines located in FiltEdge production base in China enable fast and flexible production of prototypes, trial orders, large-scale orders, and customized products, and ensure fast and on-time deliveries globally through warehouses in China and the United States.
FiltEdge experts had been supporting you from pre-sale, middle sale to after sale for helping identify root causes early and avoid repeated operational mistakes. Delivery is not the ending.
Essential Differences between Basalt Filter Bags and Fiberglass Filter Bags Post-treatments
Although both are inorganic high temperature resistant filter bags, the logic of post-treatment is very different due to the different nature of their own material properties, but the both purpose is to ensure optimal performance.
FiltEdge performs a systematic engineering evaluation based on temperature range, acid dew point, oxygen content, dust abrasiveness, dust cleaning method, etc., to propose a more appropriate combination solution.
The icing on the cake, Value-added performance enhancement
Delays aging, strengthens stability, and improves corrosion resistance
Inherently high strength, acid and alkali resistance, high toughness and folding resistance
Rough surface with certain chemically active groups, strong bonding ability
ePTFE Membrane Lamination – Optional
PTFE Impregnation – High-Concentration
Water and Oil RepellentTreatment
Acid-Resistant Finishing
Lifesaver, Timely critical support, lubrication + “thick” surface physical barrier
Decisive protection, essential for survival, compensating for defects, non-optimized
Intrinsically brittle, not wear-resistant, not fold-resistant, moderate chemical resistance
Smooth surface, weak physical adsorption capability
ePTFE Membrane Lamination – Highly Recommended
PTFE impregnation in – Low to Medium Concentration
Water and Oil Repellent Treatment
Acid-Resistant Treatment
Of course Not.
The temperature of a filter bag is never an independent indicator, it is a systematic project that works together with chemical corrosion resistance, oxidation resistance, hydrolysis, dust properties and system operation.
Temperature indicator is an empirical recommendation based on specific conditions from laboratory and operational experience, and its effectiveness varies with changing conditions.
Take PPS filter media as an example, in the case of less than 8% oxygen content, its performance is better, can maintain long-term use below 160°C (320°F) ; but when the oxygen content increases to 10%, the rate of oxidation doubled, the service life drops to about half; more than 10%, the rate of oxidation will be rapid growth, the service life will be greatly reduced, it is not recommended to use.
So the same temperature 160 ° C, the service life is a huge difference, it can not be used as the only basis for selection, otherwise it will produce huge losses.FiltEdge with a wealth of experimental and practical data to assist you in selecting the right filter bags, to maximize the risk of avoidance.
No one person or formula can tell you the precise answer.
According to the Arrhenius equation , the chemical reaction rate doubles for every 10°C (50°F) rise in temperature roughly, which can reflect a rough decrease in service life. However, the actual reaction rate and service life are not only affected by temperature, but also by chemical corrosion, moisture, oxygen, dust properties, pressure, operating conditions, etc., which is an extremely complex system engineering.
FiltEdge conducts simulation and evaluation based on laboratory and practical data, combined with rich application experience, to assist you in selecting the most suitable high temperature filter bag to avoid wrong or inappropriate selection.
Continuous Operation Temperature/Continuous Service Temperature
At this temperature the filter bag can operate stably for a long time to achieve the filtration effect.
Short Time Operation Temperature/Short Term Peak Temperature/Maximum Surge Temperatur
In actual working conditions, the system is fluctuating, it may occasionally occur that the temperature exceeds the normal range, the short time temperature refers to the working temperature that can be coped with for a short period of time occasionally, usually about 30 minutes.
Of course, both of these temperature indicators are empirical indicators combining FiltEdge laboratory and practical data. Actual performance requires careful evaluation based on your specific operating conditions.
Normal use will not.
For filter media that will shrink and deform when exposed to heat, FiltEdge will heat-set filter bags at high temperatures to ensure that they will remain dimensional stable at specific temperatures.
FiltEdge also takes into account the possibility of shrinkage when sewing the filter bags.
As long as the filter bag operates at its designed operating temperature, minor dimensional deformation within the estimated environmental variable scale will not affect its use, and filter bag detachment will not occur.
If it does occur, either the designed operating conditions are exceeded, or the filter media is not qualified or the filter bag and plate hole sizes do not match.
Not exactly.
Of course the most basic requirement for high temperature resistance is not to burn, not melt at designed continuous operation temperature, but this is not enough, FiltEdge high temperature filter bag at this temperature must keep the bag does not deform, not harden, not soften, not shrink, corrosion and aging in a controllable range, but also to play a normal filtration function, and must be continued to work to the expected extended service life.
There is no one high temperature filter bag with the same effect everywhere, there is no uniform standard.
There is no most cost-effective, only the most suitable.
All we can say is that in many cases, the fiberglass needled felt filter bag with membrane is more adaptable and more compatible with dust, flue gas, temperature, pressure drop, system type, operation and their fluctuations, making it one of the most cost-effective choices available.
FiltEdge adheres to the principles of application-specific oriented selection, providing recommendations for the most appropriate filter bag and operational guidance to minimize risk and achieve the lowest total life cycle cost.
When the flue gas temperature drops to near or below the acid dew point, the acid gas will condense into liquid acid and cause corrosion to the filter bag and dust collector, especially when the system start-up and shutdown with temperature fluctuations. Therefore, the best approach for you is to always keep the flue gas temperature above the acid dew point by 15°C (59°F), which is the safest choice.
In addition, we can also take the following measures to better cope with the situation:
- Use more corrosion-resistant fiber material;
- Overall corrosion-resistant treatment of the filter media;
- Membrane lamination, coating, water and oil repellent treatment of the filter media surface;
- Sealing and overall insulation of dust collector;
- Start-up warm-up of the dust collector;
- Start-up pre-coating;
- Controlled cleaning during operation to retain the appropriate dust cake;
- Continue to dust cleaning for a few times after shutdown, and introduce dry air;
- Bypassing can be implemented to handle unconventional situations, if permitted by regulations.
FiltEdge assesses your specific conditions, anticipates various possibilities, selects or designs the right bag, and provides operational guidance to ensure long-term, stable operation.
High temperature resistance is only a prerequisite, meeting emission standards is the basic requirement, high temperature filter bags are moving towards the following trends:
- Ultra Low Emission
- Low Pressure Drop
- System-Level Synergy of Denitrification, De-VOC and De-Dioxin
- Integrated Dust Removal Catalytic Filter Bags
- Fluoride-Free and Reduced Fluoride
- Stable and Reliable
- Extended Service Life
FiltEdge has always been at the forefront of the high temperature filtration innovation while still facing practical front line of industrial applications and customers support, proactively developing various advanced technologies to achieve better filtration performance and lower total life cycle cost.
How Can FiltEdge Help You Achieve Lower Total Costs of Ownership?
Lowering costs is never FiltEdge’s ultimate or only goal.We help you achieve lower total life cycle costs through four key areas based on accomplishing ultra-low emissions, stable operations, and improved efficiency:
Reduced Energy Consumption
– Membrane, coating, and gradient filter media technologies can help you reduce and stabilize pressure drop, reduce the possibility of condensation, and enable easy cleaning, thereby significantly reducing the energy consumption of fans and cleaning systems.
Extended Service Life
-Better quality virgin fibers provide more consistent performance and longer service life;
-Proprietary post-treatment agents achieve superior chemical resistance and extend service life;
-Proprietary post-treatment agents enhance folding ,fatigue and aging resistance;
-Water and oil repellent treatment prevents corrosion and dust cake hardening caused by condensation;
-Filter bag reinforcement and sealing technology to prevent premature failure;
-Integrated filter bag and bag cage compatibility technology to reduce wear and leakage;
-Low resistance and high air permeability to reduce the frequent high-pressure cleaning of the filter bag on the destruction.
Easy Installation/Maintenance, Reduced Expected and unexpected downtime
– Simple installation reduces manual labor;
– Easy maintenance reduces spare parts and labor costs;
– Reduced downtime to avoid systemic losses
Full Life Cycle Technical Support
Resolve your operational concerns and technical anxieties at any time, and prevent problems from occurring in advance to minimize risk proactively.
