TYPICAL PROPERTIES OF TEST FILTERS

HP GRADES
Grade Shrinkage % Air Permeability Max. Pore Diameter Minimum Strength
Lbs
Pressure Drop, PSI for 1 CFM per Sq. In. In. Water Microns In. Water
12HP 0.5-2.0 0.01-0.02 0.2-0.6 400-725 0.5-0.9 65
23HP 0.5-2.0 0.02-0.05 0.5-1.5 260-450 0.8-1.4 80
34HP 0.5-2.0 0.04-0.07 1.0-2.0 200-330 1.1-1.8 95
46HP 1.5-3.0 0.07-0.14 2.0-4.0 150-210 1.7-2.4 185
68HP 1.5-3.0 0.09-0.14 2.6-4.0 95-130 2.8-3.8 225

 
 
 
A GRADES
Grade Shrinkage % Air Permeability Max. Pore Diameter Minimum Strength
Lbs
Pressure Drop, PSI for 1 CFM per Sq. In. In. Water Microns In. Water
83A 1.5-3.5 0.25-0.50 7.0-14.0 88-90 4.0-5.5 275
103A 1.5-4.0 0.43-0.90 12.0-25.0 52-73 6.0-8.0 300
153A 1.5-4.5 0.72-1.62 20.0-45.0 30-45 8.0-12.0 300

 
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