| 摘要 |
PURPOSE: A filter medium is provided to overcome the above-described problems by taking advantage of the characteristics inherent to porous PTFE membranes, thereby be capable of establishing improved environmental cleanness. CONSTITUTION: A filter medium for filters wherein the evolution of organic gases and dusting from a reinforcing member are depressed and thus the excellent characteristics inherent to a porous polytetrafluoroethylene membrane as a collection layer are fully achieved. The filter medium (1) for filters comprises a porous polytetrafluoroethylene membrane (2) and a porous ultrahigh-molecular weight polyolefin membrane (3) as a reinforcing member for the filter medium.
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