HEPA filter is mainly used to capture particles below 0.5um dust and a variety of suspended solids. HEPA filter is mainly combined of filter media and frame shell. The basic requirement is high filtration efficiency, low flow resistance, longer time can be used continuously to reduce the cost. Adopt Mirco glass fiber paper as filter material, paper or aluminum film as separator and wooden or aluminum as frame, combined with special silicone rubber , no smell, the surface will not be hardened, a long time There will be cracks, chemical stability, corrosion resistance, can absorb the stress caused by thermal expansion and contraction without cracking, moderate hardness, elastic recovery. Each one will be tested before shipment, with high filtration efficiency, low resistance, dust holding capacity and so on. HEPA filter can be widely used in optical electronics, LCD liquid crystal manufacturing, bio-medicine, precision instruments, beverages and foodstuffs, PCB printing industry clean air purification plant at the end of the air supply. HEPA filter and ULPA filter are used at the end of the clean room, with its structure can be divided into: Deep-pleat, mini-pleat, V type, ULPA type