Melt-Blown Media

Canonical Definition

A non-woven filter media produced by extruding molten thermoplastic polymer — typically polypropylene — through a die with many fine capillary nozzles into a high-velocity heated air stream that attenuates the polymer into microfibres with diameters of 0.5–10 µm. Fibres are collected on a moving belt and thermally bonded. Melt-blown media achieves filtration ratings from 0.1 to 40 µm controlled by fibre diameter, die temperature, air velocity, and layer thickness. The random three-dimensional fibre matrix provides depth filtration without adhesive binders, making melt-blown media chemically clean and resistant to oil degradation in hydraulic and fuel applications.

Engineering Context

Melt-blown polypropylene is the standard media for fuel/water coalescer elements — its inherently hydrophobic surface promotes water droplet coalescence in fuel/water separators (HYDROCORE). Electret-charged melt-blown media — permanently electrostatic-treated to create a surface charge — achieves HEPA-equivalent efficiency (>99.95% at most penetrating particle size) at lower pressure drop than uncharged media, used in cabin air filtration (MICROKAPPA). Fibre diameter uniformity is the primary quality control parameter; wide diameter distribution creates uncontrolled pore size variation, reducing Beta ratio predictability.

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