| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a filter medium which has a dust collection performance and clogging resistance. SOLUTION: This filter material in which polyurethane foam having three- dimensional network skeleton without cell film is used for one part or all of filter constituent material features that the retention volume of dust collection when the value of pressure drop of the filter rises by 15 mmAq from the initial value to 15 mmAq in the case that the powder for class 15 test which is stipulated in JIS Z 8901 is passed at a facial wind speed of 3 m/sec for 0.4-0.8 min is >=200 g/m.</p> |
