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Polyamide (PI/P84) Needle Felts

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.

Quantity:

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
oz/yd² (g/m2)
14.75-17.70 (500-600) 23.60-26.55 (800-900) 14.75-17.70 (500-600) 550

Thickness
   Inch (mm)
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
 (m³/m².min@200PA )
27-33 (13-16) 22-33 (10-16) 6-10 (3-5)
  Tensile Strength
 lb/in (N/5CM)
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
Weft CD ≤45 ≤10 ≤45 <50
Burst Strength(Mpa/min) 2.4-2.55 2.95-3.2 2.4-2.55 2.4-2.55
Thermal Shrinkage (%) at max continuous temp. Warp MD  ≤1 ≤1 ≤1 ≤1
Weft CD ≤1.5 ≤1.5 ≤1.5 ≤1.5
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.

Power Generation
 

Cement, Mining & Rock Products
 

Asphalt & Aggregate
 

Mining & Minerals
 

Waste Incineration
 

Chemicals & Pharmaceuticals
 

Food & Beverages
 

Custom OEM Applications
 

Most common applications include: smelters, dryers, coal-fired boilers, incinerators, kilns, and calciners.

Customized per order

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