Start with the process, not a material chart
Collect the following information before comparing fibres:
- Minimum, normal and maximum gas temperature;
- Duration and frequency of startup, shutdown and upset excursions;
- Oxygen and other oxidizing species;
- Moisture, water dew point, acid dew point and condensation history;
- Gas and aerosol chemistry with concentration ranges;
- Dust loading, composition, particle size, abrasion, stickiness and combustibility;
- Actual gas flow and total filtration area;
- Cleaning method, pressure, sequence and compressed-air condition;
- Normal and alarm differential pressure;
- Required outlet emissions and measurement basis;
- Current bag construction, cage condition and observed failure mode.
Temperature tables are useful for eliminating impossible candidates, but they cannot complete the selection. The US EPA identifies gas and particle characteristics, fabric properties, air-to-cloth ratio, pressure drop and cleaning as important baghouse variables. Those variables interact: a higher filtration velocity can raise pressure drop and cleaning demand, while condensation can turn otherwise manageable dust into a blinding deposit.
A seven-step filter media selection method
Step 1: Define the full temperature profile
Do not submit only the average. Include cold starts, normal range, maximum temperature, excursion duration, excursion frequency and possible local hot spots. Keep a design margin to the supplier-approved continuous limit. A short-term rating is not a normal operating temperature.
Step 2: Establish the dew-point margin
Identify water and acid dew points where relevant. Check insulation, cold walls, fresh-air leakage, hopper heating, startup and shutdown sequences. Condensation may cause mud-like cake, bag blinding, high differential pressure and corrosion even when the fibre is described as moisture resistant.
Step 3: Map the complete gas chemistry
List SOx, NOx, HCl, HF, oxygen, alkalis, solvents and process additives as applicable. Concentration, temperature, moisture and exposure time must be reviewed together. Avoid absolute terms such as “chemical proof.”
Step 4: Characterize the dust
Fine dust, sharp particles, sticky material and high inlet loading require different structures. Include particle-size distribution, bulk density, abrasiveness, cohesiveness, oil content and combustible-dust information where applicable.
Step 5: Calculate system load
Air-to-cloth ratio is gas flow divided by active filtration area. Confirm whether gas flow is actual or standard volume and whether offline compartments have been accounted for. Review gas distribution and can velocity as well as the overall ratio.
Step 6: Match the cleaning method
Pulse-jet, reverse-air and shaker systems impose different mechanical loads. Record pulse pressure, duration, sequence and trigger logic. Media that releases dust well may still fail if cleaning is too aggressive, while conservative cleaning may allow residual cake and pressure drop to build.
Step 7: Specify the complete bag
The specification should state fibre blend, scrim, weight, thickness if relevant, surface treatment or membrane, permeability, tensile properties, sewing thread, seam, top and bottom design, dimensions and cage fit. The lowest-risk quotation is rarely the one that names only the fibre.
YuanChen media data for initial screening
The table below reproduces values listed in YuanChen’s current product PDFs. It is a product-sheet screening table, not a universal material-property table. The source documents do not state test methods, tolerances, revision dates or allowed short-term exposure duration; values must be confirmed for the offered construction and order.
| Product-sheet construction | Weight g/m² | Continuous / short-term °C | Air permeability m³/(m²·min) | Listed filtration velocity m/min |
|---|---|---|---|---|
| Polyester fibre / polyester scrim | 550 | 120 / 150 | 10–15 | <1.2 |
| Polyester membrane media* | 550 | 120 / 150 | 2–5 | <1.2 |
| Acrylic membrane media | 580 | 120 / 140 | 2–5 | <0.8 |
| PPS fibre / PPS scrim | 580 | 160 / 190 | 10–15 | Not provided |
| PTFE+PPS fibre / PTFE scrim | 650 | 170 / 200 | 10–15 | Not provided |
| Aramid fibre / aramid scrim | 550 | 204 / 230 | 10–15 | <1.2 |
| Aramid+P84 fibre / PTFE scrim | 550 | 210 / 230 | 10–15 | <1.2 |
| P84 fibre / PTFE scrim** | 550 | 260 / 280 | 10–15 | <1.2 |
| PTFE+P84 fibre / PTFE scrim** | 650 | 260 / 280 | 12–16 | <1.2 |
| PTFE fibre / PTFE scrim, membrane media | 800 | 260 / 280 | 2–5 | <1.0 |
| P84+fiberglass / high-strength fiberglass composite | 850 | 280 / 300 | 10–15 | <0.8 |
\* The polyester PDF does not identify the membrane material.
\** The P84-related temperature values require technical re-confirmation before publication or quotation.
Common industrial filter bag materials
Polyester: a practical option for moderate, dry service
Polyester is widely considered where temperature and chemistry are moderate and hydrolysis risk is controlled. It can offer good mechanical strength and abrasion performance for suitable dry dust applications. It should not be selected from price alone where hot moisture or acid condensation is possible.
YuanChen’s current polyester sheet lists 550 g/m², 120°C continuous and 150°C short-term temperature. A folder name describes one item as antistatic, but the PDF contains no conductive-fibre design, resistance value or test standard; the antistatic claim must therefore be verified separately.
Product reference: polyester filter bags.
Acrylic: evaluate for moderate-temperature moist or acidic duty
Acrylic media may be screened for some moderate-temperature applications where moisture and acidic conditions make standard polyester unattractive. The exact acrylic chemistry and surface construction matter. YuanChen’s current acrylic membrane-media sheet lists 580 g/m², 120°C continuous and 140°C short-term temperature, 2–5 m³/(m²·min) permeability and <0.8 m/min filtration velocity. The source PDF does not provide an application statement, so suitability must come from the actual gas analysis.
Product reference: acrylic filter bags.
PPS: useful within a controlled oxidation and temperature window
PPS is often evaluated for hot, moist and acidic flue gas where its oxidation exposure can be controlled. YuanChen’s pure PPS sheet lists a PPS/PPS construction, 580 g/m², 160°C continuous and 190°C short-term temperature, and 10–15 m³/(m²·min) permeability. The document describes lower-oxygen, lower-sulfur-coal direction but provides no numeric oxygen limit.
Do not copy a generic oxygen percentage into a specification. Review oxygen and oxidizing species with temperature, moisture and time. For a focused comparison, read PPS vs PTFE filter bags and the PPS filter bag product page.
Aramid: higher-temperature capability with moisture constraints
Aramid or meta-aramid is commonly considered for dry, higher-temperature service requiring good abrasion performance. Moisture, acids and alkalis can narrow its useful window, especially at elevated temperature. YuanChen’s current aramid sheet lists 550 g/m², 204°C continuous and 230°C short-term temperature and positions the item toward cement kiln-head service.
Use the generic term “aramid” unless the actual fibre brand is verified. Product reference: aramid filter bags.
P84 and aramid/P84 blends: assess shape, chemistry and verified limits
P84 fibres are used in high-temperature filtration and can support fine-particle capture through their fibre geometry. Blending with aramid or PTFE may target a different balance of temperature, chemistry, mechanical behaviour and cost. The complete blend percentage, scrim and finish should be specified.
YuanChen’s source PDFs list 210/230°C for an aramid+P84/PTFE-scrim item and 260/280°C for a P84/PTFE-scrim item. Because the latter value requires internal technical recheck, it should not be published as a firm design limit until confirmed. Product reference: P84 filter bags.
PTFE: broad resistance, but not an unlimited solution
PTFE is generally screened for severe heat, oxidation, humidity and chemical exposure. YuanChen’s current full PTFE membrane-media sheet lists PTFE fibre and scrim, 800 g/m², 260°C continuous and 280°C short-term temperature, 2–5 m³/(m²·min) permeability and <1.0 m/min filtration velocity.
PTFE’s broader operating window does not eliminate the need to control dew point, cleaning, cage condition or mechanical construction. It must not be described as resistant to every chemical at every concentration and temperature. Product reference: PTFE filter bags.
Fiberglass composite media: high-temperature screening with mechanical care
Fiberglass-based media can be considered for higher-temperature service, but flex abrasion, handling, cleaning and cage support require careful design. YuanChen’s current P84+fiberglass composite sheet lists 850 g/m², 280°C continuous and 300°C short-term temperature, 10–15 m³/(m²·min) permeability and <0.8 m/min filtration velocity. The product sheet directs it toward lower-filtration-velocity cement-kiln applications and describes average abrasion performance.
Do not use these figures as a standalone fiberglass guarantee; YuanChen’s extracted data set does not contain a separate pure-fiberglass TDS. Product reference: fiberglass filter bags.
Membrane, finish and antistatic construction are different claims
ePTFE membrane
An ePTFE membrane is a thin porous layer laminated to a backing felt. It can promote surface filtration and dust release, but the backing, bond and sewing construction retain their own limits. “PTFE membrane on PPS” is not the same product as “full PTFE felt.”
Surface finish or impregnation
Singeing, calendering, oil/water-repellent treatment and PTFE impregnation change surface or handling properties. Each needs a purpose and a testable specification. A finish cannot automatically be assumed to produce membrane-level performance.
Antistatic media
Where combustible dust or electrostatic ignition is a concern, “antistatic” should be supported by the conductive structure, resistance or charge-decay requirement, relevant test method and grounding design. A folder label or black fibre appearance is not sufficient evidence. Combustible-dust risk also requires a system-level hazard assessment; media selection alone does not make the collector safe.
Construction details that often decide service life
- Scrim: supports the felt and can determine dimensional and chemical behaviour.
- Sewing thread and seam: must tolerate the same environment and mechanical load as the felt.
- Cuff and bottom: must match the tubesheet, venturi and cage design.
- Bag-to-cage fit: incorrect fit, burrs, corrosion or misalignment can cause abrasion and tears.
- Membrane bond: requires compatible temperature, chemistry, flexing and cleaning conditions.
- Gas distribution: local velocity and dust loading can create failures that an overall average hides.
Inspect and replace damaged filter cages when necessary. New bags installed on defective cages can fail prematurely regardless of fibre quality.
Common selection mistakes
-
- Choosing from maximum temperature alone.
- Treating an upset rating as a continuous rating.
- Ignoring minimum temperature and acid dew point.
- Saying “acid gas” without species, concentration, moisture and temperature.
- Confusing full PTFE felt, ePTFE membrane and PTFE finish.
- Copying a generic oxygen limit for PPS.
- Omitting air-to-cloth ratio and cleaning data.
- Reusing old cages without inspection.
- Comparing quotations that do not state the full construction.
- Demanding a guaranteed service life without defining the operating envelope.
A short material-screening worksheet
Use this as a four-column worksheet. The Your value column is for the plant’s actual data; the Example / unit column shows the level of detail a supplier needs. “Unknown” is a valid entry when a measurement is not available.
| Question | Your value | Example / unit | Why it matters | Status / source |
|---|---|---|---|---|
| Minimum / normal / maximum temperature | 120 / 145 / 165 °C | Screens thermal envelope and condensation risk | Required / trend log | |
| Excursion duration and frequency | 180 °C for 10 min, twice per week | Separates credible upset from continuous operation | Required / control log | |
| O₂ and oxidizing species | O₂ 6–9% dry; state other oxidizers | Important for PPS and oxidation-sensitive media | Measure / gas analysis | |
| Moisture / water and acid dew points | H₂O 8 vol%; water dew point 52 °C | Identifies blinding and corrosion risk | Measure / gas analysis | |
| Gas species and concentration ranges | SOx, HCl, HF; mg/Nm³ or ppm | Supports conditional compatibility review | Required / lab report | |
| Dust loading / size / abrasion / stickiness | 8 g/Nm³; D50 12 µm; abrasive: yes | Influences felt, surface and cleaning choice | Required / dust data | |
| Actual gas flow / active filtration area | 80,000 Am³/h / 2,400 m² | Establishes air-to-cloth ratio | Calculate / drawings | |
| Cleaning method and settings | Pulse jet; 6 bar; 100 ms; on-demand | Defines mechanical load and cake release demand | Required / PLC log | |
| Bag and cage drawings | PDF/DWG with dimensions and cage condition | Prevents dimensional and fit failures | Attach / drawing | |
| Outlet target and current failure evidence | <10 mg/Nm³; photos and DP trend attached | Defines the result and likely root cause | Required / report + photos |
## When testing or a controlled trial is appropriate
Request additional analysis when gas chemistry is incomplete, process excursions are frequent, dust is unusual, competing failure mechanisms exist or the cost of failure is high. Depending on the problem, useful work may include used-bag failure analysis, dust testing, permeability or strength testing, chemical compatibility review, operating-trend analysis and a controlled compartment trial.
A trial needs predefined success criteria: duration, pressure-drop trend, emissions basis, visual inspection, cleaning settings and comparison conditions. Without them, “the bag worked” is not reusable engineering evidence.
## Send data, not just a material name
Use the [Filter Bag RFQ Checklist](https://www.yc-group.com/blog/filter-bag-rfq-checklist/) to organize process, dust, collector and construction information. Then send the completed form, bag/cage drawings and failure photos through the [contact page](https://www.yc-group.com/contact/). YuanChen can use those inputs to screen a proposed construction and identify missing measurements before quotation.
## Frequently asked questions
### What is the best material for industrial dust collector bags?
There is no universal best material. The appropriate fibre and construction depend on temperature, dew point, gas chemistry, dust, airflow, cleaning, mechanical fit, emissions and lifecycle cost.
### What is the difference between filter felt and a membrane?
The felt is the load-bearing fibrous substrate. A membrane is a thin surface-filtration layer bonded to a backing medium. The membrane does not replace the temperature and chemical limits of the underlying felt and construction.
### Why do new filter bags sometimes fail early?
Common causes include unrecognized condensation, process upsets, chemical attack, excessive cleaning, poor gas distribution, abrasive dust, damaged cages, incorrect dimensions and weak seams or bag-end construction.
### Can a supplier guarantee bag life?
A responsible commitment requires a defined operating envelope, complete construction and agreed acceptance conditions. Service life cannot be predicted credibly from fibre name alone.