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.

Advantages

High-efficiency filtration performance. Our filter paper uses high-grade wood pulp and resin materials, which are flexible and durable, effectively remove impurities, reduce wear and extend engine life.
Environmentally friendly materials. All filter papers are made of environmentally friendly materials to reduce environmental impact while providing excellent filtration effects.
Rich and diverse types. We have almost all types of filter papers on the market to meet your filter production needs.
Customized design. Our filter papers can be customized according to the specific needs of different models and usage environments. This flexibility enables the filter paper to provide optimal performance under different working conditions to meet your wide range of needs.

Surface

Smooth Surface

Corrugated Surface

Crepe Surface

Production Technology

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

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.

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.

Remark: The follow information is for reference only. Please consult our sales staff for specific selection.

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	-	-