Pores are arranged in a gradually shrinking gradient from outside to inside: the oil-facing outer layer adopts coarse fibers with large pores, the middle layer features medium-aperture glass fiber, and the inner layer consists of ultra-fine compact glass fiber with continuously varied pore sizes. Large particles are trapped by the outer layer, medium contaminants are contained in the middle layer, and fine dust is precisely intercepted by the inner layer. Contaminants are stored dispersedly throughout the entire medium thickness to prevent rapid surface blinding, boosting dirt holding capacity by 40%~50% versus homogeneous filter media and enabling mild, slow differential pressure rise.
Integrated thermocompound construction prevents layer separation and fiber shedding: multi-layer borosilicate glass fiber is impregnated with resin and thermally bonded at high temperature instead of being simply stacked. No fiber debris detaches under hydraulic pulses and alternating oil temperature flushing, eliminating servo valve contamination caused by broken glass fiber fragments. The monolithic structure boasts excellent resistance to fluid stripping.
Alternating dense-loose layers balance low pressure drop and high filtration precision: the loose outer layer delivers ample flow cross-section and low initial differential pressure with limited resistance hike under low-temperature high-viscosity oil conditions, while the compact inner glass fiber maintains a Beta value above 200 (99.5% filtration efficiency) and stable precision at 3 μm and 6 μm grades, reconciling flow capacity and fluid cleanliness.
Three-dimensional interlaced fiber deep adsorption structure: randomly crisscrossed fibers form 3D cavity channels. Apart from mechanical interception, the pores adsorb gelatin and sludge, making the media suitable for degraded oil containing colloids. Combined with star-shaped pleating design, the effective filtration area is enlarged to greatly extend service life, ideal for heavily contaminated hydraulic systems in metallurgy and heavy-duty machinery industries.
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