Longde company can produce all kinds of different performance oil filter papers with characteristics of high filtering precision and long life, and can produce all kinds of pre-curing and curing oil filter papers. Newly developed oil filter papers with high filtration efficiency and large dust capacity, in the case of the same filtration efficiency, through testing ,the dust capacity per square centimeter is 15 mg, reach the advanced level of similar products. Newly developed oil filter papers with high efficiency, through testing，the filtration efficiency of 15 micron particle size is up to more than 75%，filtration efficiency of 20 micron particle size is up to more than90%.