VENTILATION FILTER ENDOWED WITH OIL REPELLENCY

摘要

The present invention provides a ventilation filter with which excellent ventilation characteristics can be maintained without clogging of pores even in an environment exposed to oil, oil mist or ink. The present invention relates to a ventilation filter that is provided with a porous membrane having a surface coated with an oil repellent agent and is characterized in that the falling angle of 20 µl of hexadecane or pentadecane on the filter surface is 60° or less.