Filter classiifcation according to filtration efficiency, pressure drop and particule size. Particule size expressed in microns in following graph.
Classification:
Production technologies:
| Type of filter | Technology | Raw material |
| ULPA |
Wetlaid Wetlaid + Electrospinning |
Glass fibers, cellulose, PA6 |
| HEPA |
Wetlaid Wetlaid + Electrospinning |
Glass fibers, cellulose, PA6 |
| Fine fillter |
Wetlaid Meltblown Carded + needlepunch or hydroentangled |
Glass fiber, cellulose, polyester, polypropylène, PA6 |
| Primary filter |
Spunbond Carded + needlepunch or hydroentangled |
Glass fiber, cellulose, polyester, polypropylène, PA6 |
Filtering facepieces - face masks FFP |
Meltblown, Spunbond (SMS) |
Polypropylène, polyester |
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