HealthandSafetyExecutive1of11pagesCOSHHessentials:Controllingexposuretochemicals–asimplecontrolbandingapproachWhat’snew?1Thisguidehasbeenupdatedtoreflectchangesundertheclassification,labellingandpackaging(CLP)regulation.1Whoisthisguidefor?2ItisaimedatoccupationalhygienistsandotherswhowanttousetheCOSHHessentialscontrolbandingapproachtoidentifysuitableoptionsformitigatingrisksfromsubstanceshazardoustohealth.3Paragraphs34–61areaimedatmorespecialistusers,withasummaryoftherules,conversionfactorsanddefaultvaluesusedinCOSHHessentials.Whatisthepurposeofthisguide?4ThisguidancedescribeshowtheCOSHHessentialscontrolbandingwasderivedfromagenericriskassessmentscheme.AtableinAppendix1liststhecontrolguidancesheetsthatfallwithineachcontrolapproach(CA).These‘generic’sheetscontainbasicdescriptionsofcontrolequipmentandgoodpracticeforarangeofactivitiesandalsoforsomecommonoperations(egmixing,filling,weighing).5Pleasenotethatthegenericriskassessmentappliestoliquidsandsolidsonly;itdoesnotapplytogasesortoliquidsusedabovetheirboilingpoint.6Thisguidealsoexplainstheparameters,defaultsandassumptionsusedintheCOSHHessentialse-tool2anditsapplicationtosomecommonsituations.7ItdoesnotcoverthevalidationordevelopmentofCOSHHessentials–thiscanbefoundinothersources.3,4,5Thegenericriskassessmentscheme8ThegenericriskassessmentschemewasdevelopedbyasubgroupofHSE’sformerAdvisoryCommitteeonToxicSubstances(ACTS).Theschemeprovidesapracticalrouteforselectinganappropriategenericcontrolapproach.Itprimarilyinvolves:■theallocationofsubstancestoparticularhazardgroups,basedontheirtoxicologicalclassificationandlabellingunderCLP;■theanticipatedexposures,basedon:–thephysicalpropertiesofthesubstances;1of23pagesHealthandSafetyExecutive2of23pagesCOSHHessentials:Controllingexposuretochemicals–asimplecontrolbandingapproach–theamountsused;–potentialcontroloptionschosen.9Thegenericriskassessmenttakesaccountofthechemicalorproduct’shealthhazardclassificationandtheexposurepotentialasillustratedinFigure1.Figure1Factorsusedinriskassessmenttoidentifyappropriatecontrolapproach■ThehealthhazardisrepresentedbytheHazard(H)statementsassignedtosubstancesduringclassificationbysuppliersunderCLP.■Theexposurepotentialisrepresentedbyphysicalpropertiesofthesubstances(dustinessforsolids,volatilityforliquids)andtheamountusedinanoperationorprocess.■Thegenericriskassessmentscheme(whichisnotintendedforuseasanexposuremodel)categorisessubstancesintohazardgroupsandanticipatedexposurerangesassociatedwiththeproposeduse,forarangeofdifferentsituations,toidentifysuitablecontrolapproaches.10Thegenericriskassessmentschemeisdividedintofoursteps:Step1Grouphazardsthathave‘adequatecontrol’atsimilarairborneconcentrations,ie:■identifythehazardouspropertiesofthesubstancesfromlabellingandsafetydatasheetinformationorothersources;■placeintoaparticularhazardgrouporband(seeTable1).Step2Groupthe‘physicalproperties’with‘amountsused’toassigntoexposurepredictorbandswithsimilarpotentialsforexposure.Step3AssesstheanticipatedexposurebyapplyingeachCAtoeachexposurepredictorband,basedonexpertjudgement(eachCAgivesanexpectedreductioninexposure).Step4Comparethepredictedoranticipatedexposureconcentrationsinairwiththe‘acceptable’airborneconcentrationsoutlinedinTable1,tohelpselectasuitablecontrolapproach.Table1AllocationofH-statementstohazardgroupsandtheassociatedairb...
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