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We are the professional manufacture of the filter paper in China,and the quality is perfect and welcome to your ingqury! Air Filter Paper Item Quality Standard Grammage (g/m2) 110 145 Thickness (mm) ≥0.4 Corrugation Depthmm 0.2 Air Permeability (p=200pa L/m2.s) ≥300 Burst Strength (Kpa) ≥180 Max Pore Size (µm) 95 StiffnessmN.m ≥4.0 Oil Filter Paper Item Quality Standard Grammage (g/m2) 110 145 Thickness (mm) ≥0.4 Corrugation Depthmm 0.2 Air Permeability (p=200pa L/m2.s) ≥300 Burst Strength (Kpa) ≥180 Max Pore Size (µm) 110 StiffnessmN.m ≥4.0 Air and Oil Filter Paper Item Quality Standard Grammage (g/m2) 110 145 Thickness (mm) ≥0.4 Corrugation Depthmm 0.2 Air Permeability (p=200pa L/m2.s) ≥300 Burst Strength (Kpa) ≥180 Max Pore Size (µm) 110 StiffnessmN.m ≥4.0 Fuel Filter Paper Item Quality Standard Grammage (g/m2) 135±5 Thickness (mm) ≥0.35 Corrugation Depthmm 0.2 Air Permeability (p=200pa L/m2.s) ≤160 Burst Strength (Kpa) ≥260 Max Pore Size (µm) 70 StiffnessmN.m ≥4.0 we could also produce the filter paper as your requirments.