Choose Premium Automotive Filter Paper to Optimize the Performance of Oil Filters, Fuel Filters & Air Filters

Automotive filter paper is designed to operate continuously under demanding conditions, including high temperatures, high humidity, and oil contamination, thereby requiring exceptionally high standards for both materials and manufacturing processes. Our filter paper is engineered for use in automotive air, oil, and fuel filters, delivering superior performance, reliability, and service life that significantly exceeds standard filter paper. The following outlines its key advantages and selection guidelines.

Automotive filter paper in various types and colors.

Material Composition

High content of wood pulp fibers (≥ 87%): It utilizes long-fiber chemical wood pulp (e.g., softwood pulp) as the structural backbone to ensure strength and pore stability.
High-temperature resistant synthetic fibers (≤ 5%): It adds polyester or aramid fibers to enhance thermal stability (withstanding oil environments up to 190  °C).
Functional Additives:
- Resin impregnation (≤ 8%): Phenolic or epoxy resin enhances hydrolytic resistance (full resin process impregnation rate > 95%; semi-resin process impregnation rate 40%–60%).
- Ceramic micropowder: It optimizes pore size distribution (typical pore size 8–15 μm) and enhances fuel contaminant interception efficiency.

Filter Paper Types

Three automotive filter papers with corrugated surfaces in different colors.

Corrugated Filter Paper

Mechanical corrugation forms a three-dimensional wavy structure, increasing the effective filtration area by 300% compared to plain filter paper.

A roll of white automotive filter paper with a creped surface.

Creped Filter Paper

Surface pore size is smaller than the inner layer, enabling a dual mechanism of 'deep interception and surface fine filtration.'

Laminated Filter Paper

Constructed from two or more layers of filter paper pressed together, enabling functional stratification.

Manufacturing Process

Table 1: Automotive Filter Paper Process vs Standard Filter Paper Process
Process steps	Automotive Filter Paper Process Characteristics	Standard Filter Paper Process Characteristics
Pulping	Multi-stage screening removes short fibers (fiber length ≥ 2.5 mm)	Permitting retention of 20% short fibers
Resin impregnation	Segmented impregnation and infrared curing (resin distribution CV < 5%)	Single impregnation with natural air drying
Drying	Hot air penetration drying (moisture content controlled at 0.5%–1.2%)	Conventional drum drying (moisture content 2%–3%)
Surface treatment	Plasma graft modification (contact angle > 110°)	No special oleophobic treatment
Quality inspection standards	Compliant with ISO 4548-12 fuel filter testing standards	In accordance with standard industrial filter paper standards

Performance Characteristics

Filtration Efficiency Parameters (using air filter paper as an example)
- Initial filtration efficiency: Particle retention rate for 10 μm particles ≥ 98.5% (ISO 4548-4 test)
- Dust holding capacity: Dust holding capacity per unit area ≥ 300 g/m² (SAE J726 test)
- Pressure drop characteristics: Initial pressure drop < 2.5 kPa; saturated pressure drop < 25 kPa
Environmental Resistance (using oil filter paper as an example)
- High temperature stability: Tensile strength retention rate > 85% after immersion in 120 °C oil for 240 hours
- Hydrolytic resistance: Porosity change < 5% after 1000 h of damp heat aging at 85 °C/85% RH
Service Life Indicators (using fuel filter paper as an example)
- Fatigue life: Pulse pressure cycle test > 500,000 cycles (SAE J1488)
- Chemical compatibility: No fiber swelling after 500 h of contact with ethanol gasoline

Selection Reference

With over 30 years of experience in the filter industry, we are highly attentive to our customers’ stringent procurement requirements. The following represents the performance level of our filter paper for your reference.

Material Traceability

DSC thermal analysis report of wood pulp is required (glass transition temperature ≥ 180 °C).

Process Validation

Evaluate resin impregnation uniformity (using microscopic imaging to detect penetration rate deviations).

Performance Testing

Engage third-party testing for filtration ratio (β value ≥ 200) and contaminant holding capacity.

Environmental Simulation

Conduct thermal shock tests from -40 °C to +150 °C (100 cycles without cracking).

Mass Production Assurance

Verify IATF 16949 system certification and process capability index (CPK ≥ 1.33).

Contact Us

Leiman is currently developing innovative solutions including nanocellulose-reinforced filter paper (with a 40% increase in tear resistance) and intelligent coated filter paper (featuring pressure sensing for blockage warnings). We recommend staying updated on material innovations to maintain product competitiveness. To request the Automotive Filter Paper Performance Benchmarking White Paper or discuss customized development solutions, please contact us.