What structural advantages does the multi-layer composite glass fiber filter media used for Mahle filter elements possess?

Mahle’s multi-layer graded composite glass fiber filter media features a layered structure with gradually shrinking pore size from outer to inner layers, delivering remarkable overall advantages over single-layer media.

First of all, it enables graded dirt holding. The coarse outer fiber layer traps large particles, the intermediate layer intercepts medium-sized contaminants, and the dense inner glass fiber captures fine particulates. Contaminants are stored dispersedly inside each layer instead of forming surface cake blockage, greatly boosting dirt holding capacity, slowing differential pressure rise and extending filter service life.

Secondly, it balances high filtration accuracy and low pressure drop. The inner fiber ensures stable filtration efficiency and qualified beta value, while the loose outer structure expands effective flow area to lower initial differential pressure of new cartridges. This cuts system power consumption and oil temperature rise and performs better under low-temperature high-viscosity oil conditions.

Furthermore, all fiber layers are thermally bonded with resin for tight integration against delamination. No fiber shedding occurs under repeated flushing of high-pressure oil flow, preventing fine fiber fragments from contaminating hydraulic circuits and abrading precision valve components.

Besides, interlaced fibers form a three-dimensional supporting framework with outstanding resistance to pressure and hydraulic pulses. The media resists collapse under frequent pressure fluctuations caused by repeated equipment start-stop, maintaining consistent filtration precision under harsh working conditions. It is widely applied to hydraulic systems in metallurgy, construction machinery and other industries.