Cured and Uncured Filter Papers for Air Filters

Filter paper is processed by mixing plant fiber pulp and a little cotton pulp. Because of its fiber structure, leaving numerous tiny holes for liquid particles passing through and leaving solid particles out, which is the basic principle of solid and liquid separation.

  • The filter paper can separate impurity particles from the liquid and extend engine and auto service life.
  • High filtration efficiency. 98% filtration efficiency of 4 µm particles and 99% filtration efficiency of 6 µm particles.
  • Up to 800 L/m2/s air permeability.
  • Oil filter paper can withstand up to 600 kPa pressure.
  • Up to 70 70 mN/m high stiffness of cured filter paper.
Several industrial filter papers and filters on white background.
Surface
Five filter paper with smooth surface.

Smooth Surface

Five filter paper with corrugated surface.

Corrugated Surface

Five filter paper with crepe surface.

Crepe Surface

Production Technology

Industrial filter paper can be classified into cured filter paper and uncured filter paper according to dipping process

Several different colors of cured filter papers.

Cured Filter Paper

The filter paper has not been hardened after being impregnated with Phenolic resin, which can not satisfied the stiffness requirements of filter elements. After being pleated, the filter paper will be heated for 10–15 minutes at the 150 °C temperature.

Cured filter paper is widely used to produce oil and fuel filter element of heavy trucks, auto and cars.

Several different colors of uncured filter papers.

Uncured Filter paper

The uncured filter paper is impregnated with thermoplastic resin (generally is acrylic resin), and it needs little heating during production to guarantee the flexibility under room temperature.

Uncured filter paper is widely used to produce air filter elements of heavy trucks, auto and cars.

Application
Several filter papers and filters of car.

Air, Oil and Fuel Filter Elements of Car

Several filter papers and filters of truck.

Air, Oil and Fuel Filter Elements of Heavy Trucks

Technical Data
A description of leiman filter paper model.
Leiman Code Type Basic Weight (Before Cured) Basic Weight (After Cured) Air Permeability Max. Pore Size Average Pore Size Thickness Corrugated Depth Stiffness (Before Cured) Stiffness (After Cured) Burst Strength (Before Cured) Burst Strength (After Cured) Usage
- - g/m2 g/m2 L/m2/s(∆P=200 Pa) um um mm mm mN/m mN/m kPa kPa -
LM115-165AC Uncured 115±5 - 165±30 <55 <45 0.65±0.05 0.45±0.05 >5 - >260 - For air filtration
LM115-120AC Uncured 115±5 - 120±30 <43 <35 0.65±0.05 0.45±0.05 >5 - >260 - For air filtration
LM210-350OC Uncured 210±10 - 350±50 <75 <60 1.0±0.1 0.35±0.05 >15 - >450 - For oil filtration
LM130-280AS Cured 130±5 - 280±30 <65 <55 0.55±0.05 - >5 - >400 - For air filtration
LM135-250AC Uncured 135±5 - 250±30 <60 <50 0.55±0.06 0.30±0.05 >4.5 - >270 - For light duty air filtration
LM195-160AC Uncured 195±10 - 160±20 <60 <50 0.75±0.05 0.35±0.05 >10 - >550 - For light duty air filtration
LM125-380LAS Uncured 125±5 - 380±30 <80 <65 0.5±0.05 - >3.0 - >200 - For light duty air filtration
LM125-330AS Uncured 125±5 - 330±30 <75 <60 0.5±0.05 - >3.5 - >300 - For light duty air filtration
LM135-550AS Uncured 135±5 - 550±50 <85 <70 0.5±0.05 - >4.0 - >300 - For light duty air filtration
LM135-130AC Uncured 135±5 - 130±20 <50 <40 0.65±0.05 0.45±0.05 >6 - >350 - For gas turbine / industry air filtration
LM120-245AC Uncured 120±5 - 245±20 <60 <50 0.6±0.05 0.35±0.05 >4 - >220 - For gas turbine / industry air filtration
LM90-5LOS Uncured 90±5 - 5±2 <35 <25 0.25±0.05 - - - >500 - For light car oil filtration
LM90-35FS Uncured 90±5 - 35±5 <45 <30 0.4±0.03 - - - >230 - For light car fuel filtration
LM460-20OS Uncured 460±15 - 20±5 <35 <25 1.0±0.1 - >20 - >600 - For oil by pass filtration
LM280-20OS Uncured 280±7 - 20±10 <35 <25 0.7±0.1 - >20 - >450 - For oil by pass filtration
LM245-20 - 245±10 - 20±3 <20 <15 0.75±0.05 - >8 - >500 - composite
LM295-400AS Cured 295±10 285±10 400±50 <85 <70 1.5±0.1 - >50 >70 >450 >600 For air filtration
LM208-500OC Cured 208±10 198±10 500±50 <85 <75 1.1±0.1 0.35±0.05 >6 >10 >400 >500 For oil filtration
LM135-550OC Cured 135±5 125±5 550±50 <80 <65 0.65±0.05 0.35±0.05 >3 >4 >200 >380 For oil filtration
LM205-300OC Cured 205±10 195±10 300±30 <60 <50 1.0±0.1 0.35±0.05 >9 >12 >280 >450 For oil filtration
LM190-300OC Cured 190±8 185±8 300±30 <70 <60 0.9±0.09 0.35±0.05 >4 >8 >300 >400 For oil filtration
LM180-350OC Cured 180±8 170±8 350±50 <75 <65 0.9±0.09 0.35±0.05 - >10 >300 >400 For oil filtration
LM180-450OC Cured 180±7 167±7 450±50 <75 <60 0.9±0.1 0.35±0.05 >6 >7 >280 >400 For oil filtration
LM175-330OC Cured 175±8 165±8 330±30 <70 <55 0.65±0.05 0.35±0.05 >6 >8 >400 >550 For oil filtration
LM165-400OC Cured 165±8 155±8 400±50 <75 <65 0.65±0.05 0.35±0.05 >3 >5 >150 >350 For oil filtration
LM140-450OC Cured 140±5 135±5 450±50 <80 <70 0.75±0.05 0.35±0.05 >3 >5 >250 >300 For oil filtration
LM125-800OC Cured 125±5 120±5 800±80 <90 <75 0.70±0.05 0.35±0.05 >3 >4 >180 >250 For oil filtration
LM240-90FC Cured 240±10 230±10 90±30 <45 <35 0.78±0.05 0.35±0.05 >12 >14 >300 >450 For fuel filtration
LM150-100FC Cured 150±8 140±8 100±30 <50 <35 0.6±0.05 0.35±0.05 >4 >6 >300 >450 For fuel filtration
LM140-150FC Cured 140±5 130±5 150±30 <50 <40 0.6±0.05 0.35±0.05 >4 >5 >250 >400 For fuel filtration
LM208-480OS Cured 208±10 198±10 480±80 <85 <70 1.0±0.1 - >12 >15 >400 >500 For oil filtration
LM180-80FC Cured 180±7 165±7 80±10 <45 <35 0.65±0.05 0.35±0.05 >6 >10 >350 >500 For Fuel filtration
LM90-35CF - 90±5 - 35±5 <40 <28 0.4±0.03 - 0.1 - >230 - -
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Color Options
Color option board of leiman filter paper.
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