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You are here: Home » Products » Air Filtration » Needle Felt Media » Polypropylene (PP) » Polypropylene (PP) Needle Felts

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Polypropylene (PP) Needle Felts

Using the highest quality fiber materials and world-class needling techniques and equipment, HL Filter manufactures a wide range of Polypropylene(PP) needle felts with high dust-holding capacity and good air permeability. Our PP media can be used for a wide variety of applications and are characterized by their outstanding resistance to chemicals and hydrolysis.

Bulk Roll Goods: weight, thickness, density, roll width, and roll length are customized at your request.


Excellent cake release.  Lowest temperature

Polypropylene felt is used for general applications where chemical and moisture attacks other fibers.

Polypropylenes offer high strength, excellent resistance to most acids and alkalis
Smoothness of fibers allows good cake release and resistance to blinding. Moisture absorption is virtually non-existent.

Excellent resistance to both mineral and organic acids and alkalis with the exception of sodium and potassium hydroxide above 110degrees.

Fair resistance to most oxidizing agents.

Excellent resistance to most organic solvents with the exception of ketones, esters, and chlorinated hydrocarbons

Continuous operating temperature 194°F (90°C)

Fiber Materials PP-Polypropylene
Scrim Polypropylene
Standard Finish Options
(Special surface treatments available)
Heat set, singed, glazed
oz/yd² (g/m2)
11.80-14.75 (400-500) 
   Inch (mm)
0.063-0.083 (1.6-2.1) 
Air Permeability
 CFM@ ½" W.G125PA
 (m³/m².min@200PA )
12-21 (6-10) 
  Tensile Strength
 lb/in (N/5CM)
Warp MD  137 (1200)
Weft CD 160 (1400)
Tensile Elongation (%) Warp MD  ≤30
Weft CD ≤50
Thermal Shrinkage (%) at max continuous temp. Warp MD  ≤1
Weft CD ≤1.5
Max. Operating Temperature  oF (oC) Continuous 194 (90) 
Surge 230 (110) 
The data are based on laboratory conditions. 
Testing based on specific operating conditions of each installation is recommended.

Power Generation

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Paper, Pulp & Woodworking

Paints & Pigments

Cement, Mining & Rock Products

Asphalt & Aggregate

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Metals & Foundry

Food & Beverages

Custom OEM Applications

Customized per order

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