Blog Highlights
- Explore six common fabric filter media ideal for applications below 275 °F.
- Learn each fabric’s temperature limits, strengths, and best-fit industries.
- Get clear guidance on when not to use certain filter materials.
- Understand how chemical and abrasion resistance affect filter performance.
- Find the best match for your dust type, airflow, and process environment.
Why Filter Media Selection Matters
Fabric filter media are the foundation of effective dust collection. Choosing the right one helps maintain airflow, extend bag life, and reduce emissions. For operations in the regular temperature range—ambient to 275 °F—these six fabrics cover nearly all general-purpose applications.
1. Cotton (Woven)
Operating temperature: Up to 180 °F (continuous)
Best for: Shaker collectors, cleaning rooms, woodworking, cement, and rock product handling.
Strengths:
- Excellent clean-down capability—static charge doesn’t trap dust.
- Good flex and flat abrasion resistance.
Limitations:
- Poor resistance to chemicals, mineral acids, and oxidizing agents.
- High flammability—avoid when sparks or high heat are present.
Summary: A solid choice for ambient, dry environments where cost-effectiveness and easy cleaning are priorities.
2. Polyester
Operating temperature: Up to 275 °F (continuous)
Best for: Dry heat applications; the most widely used media in modern baghouses.
Strengths:
- Excellent dimensional stability and low flammability.
- Good resistance to abrasion and dry heat degradation.
- Performs well against most acids and oxidizing agents.
Limitations:
- Not suitable for moist heat or phenolic compounds.
- Vulnerable to hydrolytic degradation in humid conditions.
Summary: A versatile, durable workhorse for most standard dust applications.
3. Polypropylene
Operating temperature: Up to 170 °F (continuous)
Best for: Processes with chemical or moisture attack where other fibers fail.
Strengths:
- Excellent resistance to acids and moisture.
- Smooth fibers aid cake release and resist blinding.
- Virtually zero moisture absorption.
Limitations:
- Avoid exposure to strong alkalis like sodium or potassium hydroxide at high temperatures.
- Limited resistance to certain solvents (ketones, esters, chlorinated hydrocarbons).
Summary: Reliable, moisture-resistant choice for mild temperature and chemical environments.
4. Acrylic (Homopolymer Acrylic Felt)
Operating temperature: Up to 275 °F (continuous)
Best for: Dryers, electric furnaces, aluminum smelting, and similar heat-intensive operations.
Strengths:
- Excellent acid resistance and strong resistance to hydrolysis.
- Good tolerance for oxidizing agents and organic solvents.
Limitations:
- More costly than polyester or polypropylene.
- Limited fabric form availability.
Summary: A durable mid-range option offering superior chemical and temperature resistance for harsh dry environments.
5. Nylon (Cerex®)
Operating temperature: Up to 250 °F (continuous)
Best for: Highly abrasive dust collection applications.
Strengths:
- High abrasion resistance.
- Strong resistance to alkalis and most organic solvents.
Limitations:
- Susceptible to degradation from mineral oxides at high concentrations and temperatures.
Summary: Choose nylon when dust is abrasive—but avoid environments with strong mineral oxides.
6. High-Efficiency Felts (SlyHE, MPS)
Best for: Fine, uniform, free-flowing dust and liquid process slurries.
Strengths:
- Micro-pore fibers capture ultra-fine pollutants efficiently.
- Cost-effective alternative to PTFE membrane filters.
Summary: A smart upgrade for fine particulate applications needing high filtration efficiency without PTFE-level cost.
FAQs
Q: How do I know which filter fabric is best for my process?
A: Start with your operating temperature, moisture level, and chemical exposure. Match these to each fabric’s resistance profile.
Q: What happens if I exceed a fabric’s temperature limit?
A: The fibers may shrink, harden, or break down—leading to higher emissions and costly replacements.
Q: Can I mix filter types within one system?
A: It’s not recommended. Consistent media ensures even airflow and predictable pressure drop.
Q: Are all these fabrics compatible with pulse-jet collectors?
A: Most are, but cotton and polypropylene are more common in shaker or reverse-air systems.
Partner with Sly for Smarter Dust Collection
At Sly, we’ve been perfecting dust control for over a century. Our engineers help you match filter fabrics to your process for maximum performance and compliance. Whether you’re upgrading bags or designing a new collector, we’ll help you get cleaner air and longer bag life.
Request a quote today to find the right media for your specific temperature, dust, and airflow conditions.
Last updated: October 2025