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Many major automobile and engine manufacturers rely on the expertise of MAHLE for air filters—for good reason: engine performance, torque, low consumption, and minimal emissions require well-filtered air.
MAHLE's cellulose (paper) filters, plastic non-wovens, or a combination of both can trap just about everything. They capture up to 99.98% of toxic dust, soot, and tyre particles. The finest filters trap nearly all particles larger than 3 µm. This means that MAHLE air filters prevent premature wear of valves, cylinder surfaces, piston rings, bearings, and other engine components.
In order to protect the filters from moisture, MAHLE filter papers are impregnated with a special synthetic resin that increases the resistance of the filter insert to water and chemicals. Glue beads on the backs of the folds help the filter elements retain their shape.
| Filter type | Filter Insert |
| Length [mm] | 338,0 |
| Width [mm] | 299 |
| Height [mm] | 41,3 |
| Seal Material | Foam/Rigid Foam |
| Packaging length [cm] | 31,0 |
| Net Weight [g] | 337 |
| Packaging height [cm] | 34,50 |
| Packaging width [cm] | 4,50 |
The cellulose is first impregnated with special resins in a complex process. This increases the stability of the pleats and prevents deformation. Then they are preheated, which prepares the paper for the forming process, known as embossing. Then the paper is pleated to meet requirements. The impregnation then needs to cure in order to give the paper mechanical strength as well as chemical and thermal resistance.
Filter mats are made from plastic fibres with thicknesses in the µm range: the finer the fibre, the better the filtration. These mats are designed in layers, and the density and fineness of the fibres increase from the dirty to the clean side. Known as the funnel effect, this allows a very high dirt-holding rate with low flow resistance.
Multilayer filter media combine non-woven and paper. Their production is complex, but in comparison with conventional paper filters they hold over 40 per cent more dirt with comparable separation efficiency.
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