Filter bag media, chosen by temperature and chemistry.
The right filter bag media is set by two things: the continuous gas temperature and what is in the gas. Polyester suits up to 150 °C, PPS up to 190 °C, meta-aramid up to 204 °C, P-84 up to 240 °C and fibreglass up to 260 °C. Moisture, acids and oxygen then decide which fibre in that range will last. Masturlal makes all of these as needle felt in its own Bengaluru plant and adds a 13–15 µm ultra-microfibre surface layer to reach stack emissions of 5 mg/Nm³ or lower.
- Fibres made
- Polyester, PPS, meta-aramid, P-84, fibreglass, blends
- Top temperature
- 260 °C continuous (fibreglass)
- Surface layer
- 13–15 µm ultra-microfibre
- Emissions
- ≤5 mg/Nm³
- Made in
- Bengaluru, India, since 1971
Media comparison at a glance
| Fibre | Continuous temperature | Strengths | Watch out for | Typical duty |
|---|---|---|---|---|
| Polyester | up to 150 °C | Low cost, good abrasion resistance | Hydrolysis in hot, moist gas | Cement mills, packing, crushers, general dedusting |
| PPS (Ryton) | up to 190 °C | Resists acids and alkalis | Oxidation at high O₂ | Coal-fired boilers, waste incineration |
| Meta-aramid (Nomex class) | up to 204 °C | Strong, abrasion resistant | Acid attack and hydrolysis | Asphalt, foundry, cement raw mills |
| P-84 polyimide | up to 240 °C | Trilobal fibre, fine-dust capture | Hydrolysis in very moist gas; cost | Cement kilns, waste-to-energy |
| Fibreglass | up to 260 °C | Highest temperature, chemically stable | Flex and abrasion; needs a finish | Reverse-air kilns, calciners, furnaces |
| Ultra-microfibre surface (13–15 µm) | set by base fibre | ≤5 mg/Nm³ with low pressure drop | Must be specified to the dust | Any of the above where emissions matter |
Temperatures are continuous ratings. Short peaks can run higher, but repeated excursions shorten bag life on every fibre.
How to choose in four steps
- Start with temperature. Use the continuous temperature at the bag, not at the stack, and note how high and how often it peaks.
- Check the gas. High moisture rules out polyester and limits aramid and P-84. High oxygen limits PPS. Acid gases (SOx, HCl) attack aramid.
- Check the dust. Abrasive dust needs a heavier felt and scrim. Sticky or fine dust needs a smooth surface finish. Combustible dust may need anti-static media.
- Set the emissions target. If the limit is tight, add an ultra-microfibre surface layer to the chosen fibre rather than moving to a PTFE membrane.
Why Masturlal uses microfibres instead of membranes
PTFE membranes were designed for air filtration and can blind under heavy dust loads, which pushes up pressure drop and fan power. Masturlal needles 13–15 µm ultra-microfibres into the felt surface instead. Fine dust is held at the surface and pulses off cleanly, so emissions stay at 5 mg/Nm³ or lower while the air keeps flowing. Read the full comparison.
What to send for a media recommendation
- Collector type (pulse-jet, reverse-air or shaker) and the collector drawing
- Bag diameter, length, top and bottom construction, and quantity
- Continuous and peak gas temperature
- Dust chemistry, moisture, acid dew point and particle size
- Current bag specification, bag life and differential pressure
- Emissions target
An application engineer replies within one working day, usually with a recommended media specification within two.
Questions, answered.
Which filter bag material is best for high temperature?
Fibreglass handles the highest continuous temperature, up to 260 °C, followed by P-84 at 240 °C and meta-aramid at 204 °C. The best choice also depends on moisture, acids and oxygen in the gas.
What is the cheapest filter bag media?
Polyester needle felt is the most economical and works well up to 150 °C in dry gas. In hot, moist gas it hydrolyses, so PPS or another fibre is the better value.
Can one baghouse use different media?
Yes. A cement plant typically uses different media in the kiln, raw mill, coal mill, cooler and packing baghouses because each has a different temperature and dust.
Send us your dust profile.
Temperature, chemistry, moisture, particle size and your emissions target. An application engineer replies within one working day, usually with a media specification within two.