At Alkegen, we have studied the effect of ageing on the efficiency of fine fiber Meltblown in dynamic conditions. One HVAC grade MB7073 with an efficiency ePM1 75% according to ISO 16890 has been selected for this study. The meltblown media was produced in‑house by Alkegen using proprietary fine‑fiber technology.

This grade has filtered ambient air (rural environment) at media velocity 10.5 cm/s during the seven-month study.Temperature and relative humidity were recorded throughout the study.

Filtration properties – efficiency with KCl aerosol and pressure drop – were measured regularly during the ageing study, which was conducted at Alkegen’s filtration laboratories under controlled conditions. Over the seven-month study, efficiency remains steady and pressure drop increases slightly.

This stability can be explained by production on state-of-the-art equipment, and optimization of the additives used. These results demonstrate that the material maintains stable efficiency and acceptable pressure drop over seven months of real‑environment exposure, confirming its suitability for long‑term HVAC filtration applications...