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Fully Welded Felt Filter Bags

HL Filter offers a wide range of fully welded liquid filter bags designed and constructed to fit an assortment of filter vessels, whether from HL Filter or from another supplier. We manufacture our own felt media for our felt filter bags under 9001:2008 quality systems, resulting in order to order, year to year, reliability and repeatability. Each filter bag is also individually sealed in protective plastic packaging to prevent contamination. Our filter bags are silicone free with sturdy construction and easy installation.

Our fully welded felt filter bags feature with all seams and the collar are sonically welded (w/w/w construction), enhancing filtration quality, eliminating leaks and bypass that may have occurred with sewn seams. Welds are continuous, strong, consistent, and eliminate stray strands along the welds. Higher efficiency is due to tighter seal tolerances. The fused edges provide a fiber-free finish and virtually eliminate unwanted fiber migration.

Quantity:

Materials: Polypropylene, Polyester, Aramid, PTFE 

Available micron rating range from 0.5-200 µ (for PE, PP), 5-150µ (Aramid), 10-50µ (PTFE)

Continuous operating temperature: PE: 265°F (130°C), PP: 194°F (90°C), Aramid: 400°F (204°C), PTFE:450°F (232°C) 

Surface treatments available:  signed and/or glazed to reduce the possibility of migration

Resistance to chemicals depends on the materials (please refer to Fiber Characteristics_Liquid Filtration)

Ring/side/bottom seal construction: w/w/w (fully welded)

Optional covers to eliminate fiber release and migration

Stable and flexible fully welded seams with no threads completely eliminate the possibility of unfiltered liquid bypass through needle holes

Higher efficiency due to tighter seal tolerances

Puncture free overlap side seams provide added strength and improves effluent consistency

Lower total costs due to higher particle loading capabilities

Reduced labor costs and disposal costs from fewer change-outs

Reduced product loss due to lower hold up volumes

All industry-standard #1,2,3,4 & custom sizes available 

OEM replacement ring styles

 
Standard Needle Punched Felt Samples
Standard Needle Felt, Polypropylene (PP)
Part Number Micron Rating
Weight
oz/yd²±5% (g/m2±5%)
Thickness
   In±0.004 (mm±0.1)

Air Permeability
 CFM @ ½" W.G 125PA ±25%
(L/dm2min @ 200PA ±25%)
Tensile Strength
 lb/in±25 (N/5CM±25%)
Max. Operating Temperature Continuous/Surge oF (oC)
Warp MD Weft CD
PP-01 1 14.01 (475) 0.106 (2.7) 32(156) 69 (600) 91 (800) 194/230 (90/110)
PP-05 5 13.17 (450) 0.095(2.4) 55(270) 57 (500) 69 (600) 194/230 (90/110)
PP-10 10 10.91 (370) 0.091(2.3) 80(390) 57 (500) 69 (600) 194/230 (90/110)
PP-25 25 10.62 (360) 0.091(2.3) 123(600) 57 (500) 69 (600) 194/230 (90/110)
PP-50 50 10.32 (350) 0.091(2.3) 160(780) 57 (500) 69 (600) 194/230 (90/110)
PP-75 75 10.32 (350) 0.091(2.3) 172(840) 57 (500) 69 (600) 194/230 (90/110)
PP-100 100 9.73 (330 0.091(2.3) 252(1230) 46 (400) 57 (500) 194/230 (90/110)
PP-150 150 9.73 (330 0.091(2.3) 283(1380) 46 (400) 57 (500) 194/230 (90/110)
PP-200 200 9.44 (320) 0.091(2.3) 320(1560) 69 (600) 103 (900) 194/230 (90/110)
Standard Needle Felt, Polyester (PE)
Part Number Micron Rating Weight
oz/yd²±5% (g/m2±5%)
  Thickness Inch±20%  (mm±20%) Air Permeability
 CFM @ ½" W.G 125PA ±25%
(L/dm2min @ 200PA ±25%)
Tensile Strength
 lb/in±25 (N/5CM±25%)

Max. Operating Temperature Continuous/Surge oF (oC)





Warp MD Weft CD
PE-01 1 14.01 (475) 0.075 (1.9) 32(156) 114 (1000) 148 (1300) 265/302 (130/150) 
PE-05 5 10.62 (360) 0.091 (2.3) 61(300) 57 (500) 114 (1000) 265/302 (130/150) 
PE-10 10 10.62 (360) 0.087 (2.2) 82(400) 57 (500) 103 (900) 265/302 (130/150) 
PE-25 25 10.62 (360) 0.095 (2.4) 123(600) 57 (500) 103 (900) 265/302 (130/150) 
PE-50 50 10.62 (360) 0.102 (2.6) 164(800) 57 (500) 103 (900) 265/302 (130/150) 
PE-75 75 10.62 (360) 0.098 (2.5) 184(900) 46 (400) 91 (800) 265/302 (130/150) 
PE-100 100 10.62 (360) 0.114 (2.9) 205(1000) 46 (400) 91 (800) 265/302 (130/150) 
PE-150 150 10.62 (360) 0.122 (3.1) 266(1300) 46 (400) 80 (700) 265/302 (130/150) 
PE-200 200 10.62 (360) 0.126 (3.2) 307(1500) 46 (400) 74 (650) 265/302 (130/150) 
Further technical data, modified surface treatments, and other micron ratings are available on request

Self-supported felts are standard. Scrim-supported felts are available on request










Technical data of Aramid Needle Felts and PTFE needle Felts are available on request



Automotive

Chemicals

Electronics

Petrochemical

Lubricating Oil

Paints and Coatings

Resins, Adhesives, and Inks

Toiletries and Cosmetics

Pharmaceuticals

Food and Beverages

Metalworking

Water treatment 

Custom OEM Applications

How to order a felt filter bag




1) Material 2) Micron Rating 3) Finish 4) Size 5) Ring 6) Ring/side/bottom Construction
PE-Felt, Polyester PE:0.5-200 PL-Plain  #1 S- Carbon Steel  WWW- Fully Welded 
PP-Felt, Polypropylene PP:0.5-200 SO-Singed One Side #2 SS-Stainless Steel
NX-Felt, Aramid NX: 5-150 SB-Singed Both Side #3 Z- Zinc Galvanized Steel 
PTFE- Felt, PTFE  PTFE:10-50 GL-Glazed #4 P-Polypro PP Flange


SG-Singed & Glazed
E-Polyester PE Flange


HS-Heat Set
VS-High-temp Plastic Snap-seal


MS-Special/modified
PP-Polypro Ring 7) Options




PE-Polyester Ring HS-Handle Strap (additional handle, same media)




T-Titanium A-Automotive (bottom and side seams inside bag)




N-No Ring MC- Mesh Cover




MS-Modified/Special SB-Spunbond cover





SR-Special request












Other micron ratings, other sizes, and special design are available on request



 


Standard Bag Size #1 #2 #3 #4
Surface Area  2.6 (0.24) 5.2 (0.48) 0.9 (0.08) 1.7 (0.16)
ft2 (m2)
Volume 2.1 (7.9) 4.5 (17.0)
0.7 (2.7)
U.S gal (liter) 0.37 (1.4)
Max. Flow Rate 90 (20) 180 (40) 26 (6) 53 (12)
GPM (m3/h) 
Bag Diameter 7.0 (180) 7.0 (180) 4.0 (105) 4.0 (105)
inch (mm)
Bag Length 17.0/430 32.0/810 9.0/230 15.0/380
Inch (mm)
Other Bag Size Available upon request
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