Specification for oil filter paper: 1) Weight: 120-145gsm 2) Thickness: 0.45mm 3) Air permeability (200Pa L/100cm?min): no less than 450 4) Burst strength (KPa): no less than 200 5) Resin content (%): 20~22 6) Maximum pore size: 70 7) Mean pore size: 60 8) Corrugated depth (mm): 0.25 9) Paper color as requested 10) Roll length and roll inner pore diameter as requested 11) Plain paper or corrugated paper as requested