HEPA filtering paper is made by PTFE membrane material, including the specifications as follows: H10, H11, H12, H13, H14. It has merits as follows: high filtration efficiency, large dust containing capacity , small resistance and it can be cleaned repeatedly, etc. It is widely used in below industries: electronics, precision apparatus and instrument, machinery, metallurgy, chemical industry, textile industry, medicine, food and air purification and filtration for air conditioning system. It can also be used as prepositive filter of high efficiency air filter so to reduce the load and prolong its service life. Various specifications can be booked according to user’ s requirements