Patent ID: 6120616
Filing Date: 2000-09-19
Classification: B08B

Abstract:
A method for cleaning porous polymeric members, said method comprising:providing a porous polymeric member, said porous polymeric member comprising an outer surface and comprising a plurality of impurities distributed through said porous polymeric member, said impurities including trace metals, loose portions of polymeric material, and charged particles;subjecting said porous polymeric member to a wash cycle, said wash cycle comprising the steps of:applying an acid treatment to said porous polymeric member, said acid treatment removing a portion of said trace metals from said porous polymeric member;applying a base treatment to said porous polymeric member, said base treatment removing a portion of said charged particles from said porous polymeric member;applying a chelating agent to said porous polymeric member, said chelating agent removing remaining trace metals from said porous polymeric member; andapplying a rinsing treatment to said porous polymeric member, said rinsing treatment removing a portion of said loose portions of said polymeric material from said porous polymeric member.