The spcification as belows:
Basis Weight:135±5g/㎡
Filter paper width (height) available: 80mm-1600mm
Thickness: 0.35-0.55mm
Pore size: around 45-80um
Air Permeability :100-650L/m2. s
Corrugation Depth :0.25±0.05mm
Bursting strength>=300kpa   
Resin Content :17%-28%
Plain paper or corrugated paper as requested
All colors can be produced and technical data can be adjusted as customer request.
Inner packing: Plastic film, Outer packing: Kraft paper and paper board, also packing according to

customers'need