... the defense industry, electronic instrument, medical, food industry and textile industries, etc.3. Characterized by stable property, ... holding capacity, high efficiency, low air resistance and high strength, etc.4. It is an ideal material for air ... are divided into three types (ASHRAE, HEPA and ULPA).ClassificationGradeThicknessMDCDStiffnessFilter EfficiencyFilter ResistanceASHRAEF60.35-0.381.20.51 ...