Fine Filter Board,Fine Filter Paper Board Made of cotton pulp,contain diatomite. Food grade. Focus on fine filtration for follow: Used in frame filter for filtration of bear,juice,wine,vegetable juice,medicine nutrient,also can be used for filtration of medicine,oral liquid,beewax,glycerol,honey etc. GSM:1300100g/ Color:gray white Size:300*300mm,367*367mm,400*400mm,600*1220mm,1000*2000mm,1200*2400mm,can be cut into any shape according client s request,such as square,circle,and can be punched. Through the FDA testing. GB11680-1989 GB/T21928-2008 Use instruction:rough side is entrance of liquid,smooth side is exit of liquid