... made of aluminum,cooper plated nickel & S/S plate and form the filter disc after cold stamping . In 2009, we ... get the China National Patent in oil filter. And we also get the ISO 9001:2000 and ... available, such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, filter cartridge , filter equipments etc.Reason 4Shanghai Baosteel ...