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Catalago Mezclas paxair

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  • DSpecialty Gases & Equipment

    Mixtures

  • 1-877-PRAXAIR www.praxair.com/specialtygases

    Mixtures

    Mixture Order MixtureComponent Blend Analytical Grade Reference ConcentrationRange Tolerance Uncertainty

    EVEnvironmentalGrades(1)

    NTRM T N/A N/A 1%EPAProtocol E 2ppm-25ppm 10% 1% 25.1-49.9% 5% 1%PrimaryMaster N 1ppm-9.9ppm 10% 0.1ppm 10ppm-25ppm 10% 1% 25.1ppm-9999ppm 5% 1% 1.0%-49.9% 2% 1%or 0.02%abs*CertifiedMaster M 1ppm-25ppm 20% 5% 25.1ppm-999ppm 10% 2% 0.1%-49.9% 5% 2%DynamicBlend D 1ppm-99ppm Zero 2%Master 100ppm-49.9% Zero 1%DynamicBlend Y 1ppm-99.9ppm Zero 5%Standard 100ppm-49.9% Zero 2%

    STStandardGrades

    PrimaryStandard P 1ppm-9.9ppm 10% 0.1ppm 10ppm-25ppm 10% 1% 25.1ppm-999ppm 5% 1% 0.1%-49.9% 2% 1%or 0.02%abs*CertifiedStandard C 1ppm-99.9ppm 20% 5% 100ppm-999ppm 10% 2% 0.1%-49.9% 5% 2%Non-Certified U 1ppm-999ppm 20% N/AStandard 0.1%-49.9% 10%CustomStandard Z 1ppm-49.9% TBD TBD

    * Whicheverissmaller.(1)AllEnvironmentalGradesareNISTtraceable.Actualranges,blendtoleranceandanalyticaluncertainty arebasedonavailableNationalInstituteofStandardsandTechnology(NIST)SRMconcentrations. Pleaseseeindividualcomponentsforspecificinformation.

    Note:Forallmixtures,blendtoleranceandanalyticaluncertaintyspecificationmayvarydependingonthechemicalcharacteristicsofthecomponentandthecylindersize.Formixturesoutsideoftheseranges,pleasecontactyourlocalPraxairrepresentative.

    Grade Specifications

    D

    1

    PraxairGrades

    EnvironmentalGrades NTRMNISTTraceableReference MaterialsarecertifiedbytheNational InstituteofStandardsandTechnology (NIST)andacceptedbytheEnviron- mentalProtectionAgency(EPA),as thehighestaccuracystandardscom- merciallyavailable.Thesestandards aretheregulatoryequivalenttoNISTs StandardReferenceMaterials(SRMs) andaremadeupofthesamecompon- entsandarewithintheanalyticalrange ofNISTSRMs.EPAProtocolsUsedforthecalibration andauditofContinuousEmissionMoni- tors(CEMs),PraxairEPAProtocolsare NISTtraceableandproducedinaccor- dancewiththelatestEPAspecifications foundindocument-600/R97/121 Rev.9/97.PrimaryMasterHighaccuracymix- turespreparedgravimetricallyonelectronic high-precisionbalances.Thesestandards areanalyzedandnamedagainstNIST traceablereferencematerials.Certified Master Theseroutinecali- brationmixturesarepreparedbyeither gravimetric,volumetricorpartialpressure methodsandanalyzedagainstNIST traceablereferencematerials.Dynamic-BlendMasterThesezero blendtolerancemixturesareprepared onaninstrumentbaseddynamicblending system.Batchesofcylindersfromtwo toonehundredcanbeproducedwith theidenticalconcentrations.Dynamic-BlendStandardThesemix- turesarepreparedsimilarlytotheDynamic BlendMaster.Certificationofthemixtures isbasedonprocessaccuracyandPraxair PrimaryLaboratoryStandards(PPLS).AllmastergasesareanalyzedandnamedagainstNISTtraceablematerials.

    StandardGradesPrimaryStandardHighlyaccurate mixturespreparedgravimetricallyon high-precisionelectronicbalances. Thesestandardsareanalyzedagainst PraxairPrimaryLaboratoryStandards (PPLS)andnamedtoagravimetrically generatedconcentration.Certified Standard Theseroutine calibrationmixturesarepreparedbyeither gravimetric,volumetricorpartialpressure methods.Thesestandardsareanalyzed againstPraxairPrimaryLaboratory Standards(PPLS).Non-Certified Mixturesareprepared bythesamemethodsandthesamecare usedforCertifiedStandardGrades. Analysesarenotreported.CustomMixturespreparedtothe exactblendtoleranceandanalytical uncertaintyrequested.

    4.75% 5%

    5.10% 5.20%

    5.25%

    Blend Tolerance

    Requested Concentration

    ReportedConcentration

    CertificationAccuracy

    Example: Relative Absolute Value Value

    BlendTolerance 5%ofminor 0.25% component

    AnalyticalUncertainty 2%ofminor 0.10% component

  • 1-877-PRAXAIR www.praxair.com/specialtygases

    Mixtures

    Behind The Scenes

    D

    2

    Safe, Accurate, Consistent, Reliable... Every Time

    Sophisticated communication programs and mixture blending software (worldwide databases with international access) provide the very latest in mixture technology for our customers.

    Component Raw Material Allblendingsourcegasesandliquids arequalifiedtoensurethattheyare appropriateforyourapplication.We havedeterminedthroughexperience thatcertainimpuritiesaffecttheper- formanceorstabilityofthefinal mixture.

    Wehavedevelopedandusedspecial proprietarypurificationtechniquesfor theremovalofcriticalimpurities.Upon requestacompleteimpurityprofileor specificimpurityanalysescanbe provided.

    Cylinder Preparation Praxairutilizesaseriesofcomputer controlledheating,vacuumandpurge cyclestopreparebothaluminumand steelcylinders.

    Forlowconcentrationorhighly reactivecomponentsweuseour additional,proprietarycylindertreat- mentprocesses.Withtheapplication oftheseuniquecylinderpreparation processes,weareabletoproduce accuratepartperbillionandlowpart permillionconcentrationreactivegas mixtureswithguaranteedstabilities.

    Blending Systems Praxairpreparesmixturesutilizing highload,highsensitivityGravimetric Balances,MicroBalanceCapillary Injection,ComputerizedDynamic BlendingSystemsandVolumetric Manifolds.Ineverycaseweusethe methodbestsuitedtoyourapplication.

    Allgravimetricbalancesarecalibrated withNISTtraceableweights.Allbalan- ces,gaugesandprocessinstruments undergospecifiedperiodicmainte- nanceandcalibration.

    Mixture Homogenization Onceaparticularmixtureisprepared, mechanicalrolling,gasturbulenceor molecularagitationisusedtoensure thehomogeneityofthefinalmixture.

    Analytical Instrumentation GasChromatography (GCdetectors,-TCD,FID,ECD, HID,DID,FPD,PID,NPD,RGA) Chemiluminescence FourierTransformInfrared(FTIR) AtomicAbsorption(GFAA) MassSpectroscopy(MS) FluorescenceUV ProcessInstrumentation (NDIR,O2,THC,H2O)

    Reference Materials StandardReferenceMaterials (SRM) NISTTraceableReference Materials(NTRM) GasManufacturersIntermediate Standards(GMIS) PraxairPrimaryLaboratory Standards(PPLS)

    Ongoing Inter-Laboratory Quality Assurance Evaluation Programs PerformedQuarterly

    Praxairs North American Specialty Gas Facilities are staffed with chem-ists and engineers trained in the preparation and analytical certifica-tion of specialty gas mixtures.

    A knowledgeable sales and technical support team is ready to assist you in determining and specifying all your specialty needs including: high purity gases, calibration mixtures and the correct delivery equipment.

    Manufacturing And Quality Control

    Producingqualitygasmixturesbeginswithpropercylinderselectionandpre-parationtoensurehighqualityanden-hancedstability.Outletsareselectedac-cordingtoCompressedGasAssociation(CGA)guidelines.

    ThemanufactureandcertificationofallPraxairspecialtygasesaredocumentedinacomprehensivequalityassurancemanual.Whereappropriate,traceabilitywillbeestablishedtoPraxairPrimaryLaboratoryStandardsortoNISTTrace-ableStandards.Allprocesses,proce-dures,analyticalmethodsandreportsarecarefullydocumented,controlledandinternallyassessedbyPraxairQ.C./Q.A.Officers.

    Documentation

    Certification:

    Certificate of Compliance (COC1)Documentthatdelineatesthataproductmeetsorexceedstheminimumpurityoranalyticalaccuracyasspecified.

    Certificate of Conformance (COC2)Statementofguaranteethattheproductfromaspecificbatchconformstothecomponents,minimumpurityandmaxi-mumimpurityspecificationsaslisted.

    Certificate of Analysis (COA)Adocumentthatreportstheactualanalyticaltestresultsforpureproductorforacalibrationmixture.Eithersinglecylinderorbatchanalysiscertificationisavailable.

    Available Upon Request!

    Ask About OurISO Certified Specialty

    Gas Plants

  • 1-877-PRAXAIR www.praxair.com/specialtygases

    Mixtures

    Behind The Scenes

    D

    3

    Mixture Safety and Quality

    Safety and quality considerations limit the mixtures we can offer among these are:

    Fuel Oxidizer Mixtures Praxair will complete a safety review foranymixturescontainingflammable and oxidizing components. Each mixture is evaluated to ensure the flammableconcentrationiswellbelow theflammablelimits.Praxairwillde- termineifthemixturemustbemade at reduced pressure. Final mixture pressuresarebasedonBTU calculations.

    Vapor Pressure Restrictions Mixtures containing low vapor pressure components are generally made at reduced pressures.

    Pressure reduction helps prevent condensation of less volatile component and ensures mixture homogeneity. Computer modeling is used to generate phase envelopes for mixture evaluation and determi nation of appropriate pressures.

    Whereapplicable,Praxairwill recommendlow-pressurecontainers to maximize the volume of contents. RefertopageB4fordetails.

    Reactive Gas Mixtures Mixturestabilityisassessedtomake sure the requested components do not react with each other or with the cylinder. Primary consideration is given to safety and the potential by-productscreatedbyachemical

    reaction.Integrityofanalyticalaccu- racyisalsoevaluated.Afeasibility review is peformed prior to mixture preparation.

    Whereapplicable,Praxairwillprovide aluminum or specially treated cylinders for low concentration reactive gas mixtures.SeeSectionBfordetailson aluminum(pageB3)cylinders.

    Thestabilityofcertaingasmixtures canbeaffectedbythelengthoftime theyarestored,aswellasthestorage temperature.Toensuretheintegrity ofgasmixtures,storagetimeand temperatureforsusceptiblemixtures shouldbemonitored.

    Mixture Grades and Specifications

    Praxair mixtures are grouped into two basic categories, environmental and standard. Please refer to the table on page D1 for complete specifications of all available grades.

    Environmental Gradeshavebeen developed to meet the stringent requ