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    Membrane filter

    A membrane filter is a matrix with channels which act as a screen and retain particles larger than the filter on the surface of the 
    membrane.
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    1. What is a membrane filter?

      What is a membrane filter?

      Amembranefilterisamatrixwithchannelswhichactasascreenandretainparticleslargerthanthefilteronthesurfaceofthe membrane.Membranefiltersallowtheretentionofsub-micronparticlesandorganisms. NotethatporeshavenotbeenobservedinROorNFmembranesusingami...

    2. What is the maximum temperature for the different filter membranes?

      What is the maximum temperature for the different filter membranes?

      Themaximumoperatingtemperaturesforfiltermembranesarelistedbelow. Ceramic-350C PolycarbonateTrackEtch-140C Polyester-140C Nitrocellulose(MCE)-130C Nylon-180C Polyethersulfone(PES)-180C Polypropylene-82C CelluloseAcetate-135C PTFE(Laminated)-1...

    3. What is hydrophilic vs hydrophobic membrane?

      What is hydrophilic vs hydrophobic membrane?

      Hydrophilicfilterspossesanaffinityforwaterandcanbewettedwithalmostanyliquid.awidevarietyofhydrophilicmembranes, including: SilverMetal Polyethersulfone(PES) GlassFiber PolycarbonateTrackEtch(PCTE) Polyester(PETE) MixedCelluloseEsters(MCE) Ny...

    4. How is the performance of a filter measured?

      How is the performance of a filter measured?

      Designandmaterialselectiondeterminestheperformanceofafilter.Threeimportantmeasuresoffilterperformanceareflowrate, throughputandbubblepoint,definedasfollows: FlowRate:Determinesthevolumeofliquidorairthatwillflowthroughthefilteratafixedpressur...

    5. What organisms are used to determine pore size?

      What organisms are used to determine pore size?

      PoreSize ChallengeOrganism 0.1m Acholeplasmalaidlawii 0.2m Brevundimonasdiminuta 0.45m Serratiamarcescens 0.8m Lactobacillusspecies 1m Candidaalbicans...

    6. What variables affect the performance of a filter?

      What variables affect the performance of a filter?

      Porosity:Theflowrateofamembraneisdirectlyproportionaltotheporosityofamembrane,eg.themorepores,thehighertheflowrate. FilterArea:Thelargerthefilterarea,thefastertheflowrateatagivenpressuredifferentialandthelargertheexpectedfilterthroughput vol...

    7. How are pore sizes rated?

      How are pore sizes rated?

      Aporesizeratingisdeterminedbythediameteroftheparticlethatitcanbeexpectedtoretainwithadefined,highdegreeofefficiency. Theratingisstatedinnominalorabsoluteterms....

    8. What is the difference between nominal and absolute pore size ratings?

      What is the difference between nominal and absolute pore size ratings?

      Nominalporesizeratingdescribestheabilityofthefiltertoretainthemajorityoftheparticlesattheratedporesizeandlarger(60-90%). Glassfiberfiltersandscreenfiltersareagoodexampleofnominallyratedfiltration. Absolutesizeratingdescribestheporesizeatwhic...

    9. What is a KD (kiloDalton)?

      What is a KD (kiloDalton)?

      KD,orkDistheabbreviationforkiloDaltonandisequalto1,000MolecularWeightCut-Of(MWCO).Asolutionhavingamolecularweight of1,000,000wouldbeequivalentto1,000KD.ThetablelistedbelowgivesageneralrelationshipbetweenkiloDaltontoMicrons (micrometers), Nan...

    10. Are Syringe Filters certified pyrogen free?

      Are Syringe Filters certified pyrogen free?

      No,notnormallyperformedpyrogentestsonourfilters....

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