The Difference Between Different Fabrics
Why Filter Bag Material Matters
Selecting the correct filter bag material is critical for durability, filtration efficiency, and cost-effectiveness. The wrong choice can lead to premature failure, downtime, or safety risks. Below, we break down key materials used in industrial filtration.
1. Nylon (Polyamide)
Pros:
- Excellent abrasion resistance for slurries with abrasive particles.
- Good oil resistance (ideal for lubricant filtration).
Cons:
- Poor resistance to strong acids/bases.
- Rapid hydrolysis in prolonged (>500h) high temperature (>120℃) and humidity (>80% RH), causing strength loss.
- Absorbs moisture (4% at 80% RH), leading to 3-5% swelling and pore blockage.
2. Polyester (PET)
Pros:
- Resists weak acids (pH ≥4).
- Short-term exposure up to 150℃ (long-term ≤120℃ in dry gas).
- Affordable and widely available.
Cons:
- Vulnerable to hydrolysis above 60℃ in wet conditions.
- Unsuitable for alkaline environments.
3. Polypropylene (PP)
Pros:
- Resists ≤70% sulfuric acid at 25℃ (static) and bases up to pH 14.
- Hydrophobic: Minimal swelling in water.
- Low cost, disposable option.
Cons:
- Max 90℃ in liquids (dynamic conditions ≤70℃) / 180℃ in gas).
- Poor oil/solvent resistance (swells in hydrocarbons).
4. PTFE (Polytetrafluoroethylene)
Pros:
- Exceptional chemical resistance (pH 0–14).
- Withstands 260℃ continuous / 280℃ short-term peak.
- Non-sticky surface reduces dust accumulation (self-cleaning efficiency improves 30-50%).
- Negligible moisture absorption (≤0.01%).
Cons:
- High cost and low abrasion resistance (avoid sharp particles).
- Requires specialized seaming techniques.
5. PPS (Polyphenylene Sulfide)
Pros:
- Resists organic solvents (ketones, esters).
- Low moisture absorption (<0.1%).
Cons:
- Degrades in >10% chlorine or nitric acid.
- Max 95℃ in liquids; dry applications (e.g., coal-fired boilers) withstand 190℃ (oxygen <8%,otherwise, PTFE coating is required).
Need Help Choosing?
Contact us for expert guidance—we"ll provide tailored solutions based on your operational parameters (dust type, humidity, temperature).
