Premium-grade semi-cured cellulose air filter paper rolls featuring an optimized 125g/m² basis weight and 18%-22% impregnated phenolic resin (B-stage). Engineered for high-efficiency heavy-duty automotive and industrial engine filtration. Delivers excellent pleating rigidity and superior dry burst strength of ≥280 kPa—designed for seamless processing on our Automatic Zig-Zag Rotary Air Filter Paper Pleating Machine.
This high-performance Premium Semi-Cured Cellulose Air Filter Paper (widely known in the industry as premium B-stage resin-impregnated filter paper) is manufactured from select long-fiber wood pulp and impregnated with a high concentration of semi-cured phenolic resin. It is specifically engineered to meet the demanding requirements of heavy-duty commercial trucks, construction machinery, and high-output industrial air intake systems.
Compared to ordinary filter papers, this premium-grade cellulose media leverages an optimized 125g/m² basis weight and a higher resin content (18%-22%) to provide exceptional structural strength under high-suction and high-humidity environments. After pleating, a simple thermal curing step fully cross-links the resin network, giving the filter element superior wet burst strength, reliable resistance to chemical vapors, and outstanding moisture durability.
Technical Specifications
The factual mechanical parameters and material properties of our Premium Semi-Cured Cellulose Filter Paper are detailed below:
Technical Parameters
Factual Specifications
Material Composition
100% Premium Long-Fiber Cellulose (Wood Pulp)
Resin Type
Premium Semi-cured (B-stage) Phenolic Resin
Resin Content
18% – 22%
Basis Weight
125 ± 5 g/m²
Thickness
0.45 ± 0.03 mm
Corrugation Depth
0.20 – 0.28 mm
Air Permeability
240 – 300 L/m²/s (at pressure drop Δp = 200 Pa)
Mean Pore Size
50 – 60 μm
Burst Strength (Dry)
≥ 280 kPa
Burst Strength (Wet)
≥ 180 kPa
Recommended Curing Temp
140°C – 150°C (for 10 to 15 minutes after pleating)
Key Features & Performance Advantages
1. Exceptional Rigidity for Heavy-Duty Use
Formulated with an increased 18%-22% phenolic resin ratio, this paper provides superior mechanical stiffness after curing. The resulting pleated filter walls remain perfectly vertical and resist deformation even under intense engine intake suction and turbulent airflows.
2. Outstanding Wet Burst Strength (≥180 kPa)
The dense, high-grade resin matrix cures to form a highly moisture-resistant barrier around the cellulose fibers. This ensures that the pleated paper does not soften, sag, or tear when operating in heavy rain, dense fog, or highly humid environments.
3. Deeper Corrugation Profile
Features a uniform, deep embossing profile (0.20 – 0.28 mm) that creates consistent spacing between adjacent pleats. This prevents pleat-to-pleat contact (pleat pinching), keeping the entire filtration surface area fully active during operation.
4. Advanced Dust-Holding Capacity
The structural layout of long-fiber cellulose pulp offers a progressive density gradient. This allows deep-bed particle capture throughout the depth of the paper, significantly lowering the initial pressure drop while extending the filter cartridge change-out intervals.
Applications & Industrial Uses
This premium wood pulp filter paper roll is the preferred media for manufacturing:
Heavy Construction Machinery: Primary intake filters for excavators, loaders, mining trucks, and bulldozers.
Agricultural Equipment: Air intake filters for tractors, harvesters, and combines working in high-dust crop environments.
Strict Batch-to-Batch Quality: Every shipment is subjected to strict lab verification for basis weight, thickness, and air permeability, ensuring consistent downstream filtration performance.
Moisture-Resistant Export Packaging: Rolls are wrapped in heavy-duty polyethylene plastic moisture barriers and packed in robust, export-grade cardboard boxes to prevent the B-stage resin from prematurely curing or absorbing moisture during sea transit.
Frequently Asked Questions
A: Our Premium version utilizes a higher basis weight (125g/m² vs 115g/m²) and a higher resin content (18%-22% vs 16%-20%). This gives the Premium paper significantly higher dry burst strength (≥280 kPa vs ≥240 kPa) and wet burst strength (≥180 kPa vs ≥150 kPa), making it ideal for heavy-duty construction and agricultural machinery operating in extremely harsh, high-dust environments.
A: Yes. Because of the higher resin content and thickness, pre-heating the paper to 100°C–120°C on our Automatic Zig-Zag Rotary Air Filter Paper Pleating Machine is essential. Pre-heating temporarily softens the B-stage phenolic resin, preventing any fiber micro-cracking at the pleat tips during folding.
A: To fully cross-link and activate the premium phenolic resin, the finished pleated filter packs must be cured in a standard thermal oven at 140°C–150°C for 10 to 15 minutes. This process is critical to lock in the paper’s final water-resistant and mechanical properties.
