Using the highest quality fiber materials and world-class needling techniques and equipment, HL Filter manufactures a wide range of Polyamide needle felts with high dust-holding capacity and good air permeability. The PI/P84 media has good chemical resistance, but this is endangered under highly alkaline moisture conditions. There is a limited tendency to oxidation through O2 or NO2 at high temperatures.
Bulk Roll Goods: weight, thickness, density, roll width, and roll length are customized at your request.
High termperature needle punched felt
Non-flammable and thermostable organic fiber
Offers extended bag life in low pH applications
helps reduce differential pressure across the baghouse
Operates in high temperature applications against acid attacks and is resistant to flex abrasion (unlike Fiberglass).
Not recommend for high concentration of alkalis at high temperatures.
Continuous operating temperature 460oF (240°C)
|Fiber Materials||PI-Polyimide||PI-Polyimide||PI-Polyimide||Polyimide + Aramid|
|Scrim||Polyimide scrim||Fiberglass scrim||PTFE Scrim||Polyimide scrim|
| Standard Finish Options |
(Special surface treatments available)
|Heat Set, Singed, Glazed, PTFE membrane (or PTFE bath)|
| Weight |
|14.75-17.70 (500-600)||23.60-26.55 (800-900)||14.75-17.70 (500-600)||550|
|0.075-0.091 (1.9-2.3)||0.098-0.12 (2.5-3)||0.075-0.091 (1.9-2.3)||(2.3-2.7)|
| Air Permeability |
CFM@ ½" W.G125PA
|27-33 (13-16)||22-33 (10-16)||6-10 (3-5)|| |
| Tensile Strength |
|Warp MD||69 (600)||205 (1800)||69 (600)||>900|
|Weft CD||91 (800)||205 (1800)||91 (800)||>1200|
|Tensile Elongation (%)||Warp MD||≤25||≤10||≤25||<35|
|Thermal Shrinkage (%) at max continuous temp.||Warp MD||≤1||≤1||≤1||≤1|
|Max. Operating Temperature oF (oC)||Continuous||465 (240)||465 (240)||465 (240)||465 (240)|
|Surge||500 (260)||500 (260)||500 (260)||500 (260)|
| The data are based on laboratory conditions. |
Testing based on specific operating conditions of each installation is recommended.
Cement, Mining & Rock Products
Asphalt & Aggregate
Mining & Minerals
Chemicals & Pharmaceuticals
Food & Beverages
Custom OEM Applications
Most common applications include: smelters, dryers, coal-fired boilers, incinerators, kilns, and calciners.
Customized per order