Def Stan 93-41-1989 Rubber sheet, cellular, open c

MinistryofDefenceDefenceStandard93–41/Issue230June1989RUBBERSHEET,CELLULAR,OPENCELL,MINIMUMTARNISHINGThisDefenceStandardsupersedesDefenceStandard93-41Issue1dated30June1982DEFSTAN93-41/2AMENDMENTSISSUEDSINCEPUBLICATIONAMDNODATEOFISSUETEXTAFFECTEDSIGNATURE&DATERevisionNoteThisStandardhasbeenrevisedtobringtestmethodsandproceduresintolinewithup-to-daterequirements.HistoricalRecordCS3067A30August1960CS3068B22July1965DefStan93-41/130June1982DEFSTAN93-41/2RUBBERSHEET,CELLULAR,OPENCELL,MINIMUMTARNISHINGPREFACEThisDefenceStandardsupersedesDefStan93-41/1dated30June1982iThisDefenceStandardrelatestorubbersheet,cellular,opencell,minimumtarnishingforMinistryofDefenceuse.IthasbeenpreparedbytheRubbers,PlasticsandAdhesivesSubcommitteeoftheDefenceEngineeringandEquipmentStandardizationCommittee.iiThisStandardhasbeenagreedbytheauthoritiesconcernedwithitsuseandshallbeincorporatedwheneverrelevantinallfuturedesigns,contracts,ordersetcandwheneverpracticablebyamendmenttothosealreadyinexistence.IfanydifficultyariseswhichpreventsapplicationoftheDefenceStandard,theDirectorateofStandardizationshallbeinformedsothataremedymaybesought.iiiAnyenquiriesregardingthisStandardinrelationtoaninvitationtotenderoracontractinwhichitisinvokedaretobeaddressedtotheresponsibletechnicalorsupervisingauthoritynamedintheinvitationtotenderorcontract.ivThisStandardhasbeendevisedfortheuseoftheCrownandofitscontractorsintheexecutionofcontractsfortheCrownand,subjecttotheUnfairContractTermsAct1977,theCrownwillnotbeliableinanywaywhatever(includingbutwithoutlimitationnegligenceonthepartoftheCrownitsservantsoragents)wheretheStandardisusedforotherpurposes.1DEFSTAN93-41/2CONTENTSPAGEPreface1234567891011ScopeWARNINGRelatedDocumentsInformationtobeSuppliedbythePurchaserDescriptionCompositionDimensionsTestSamplesTestRequirementsMethodsofTestContainersandMarkingofContainersAnnexA-MethodofTestforCompressionStrainunderStressAnnexB-MethodofTestforExtentofTarnishing133344444466A-1B-12DEFSTAN93-41/2SPECIFICATIONFORRUBBERSHEET,CELLULAR,OPENCELL,MINIMUMTARNISHING1Scope1.1ThisDefenceStandardspecifiesrequirementsforanopencellcellularrubbersheetofminimumtarnishingqualityavailableinvariousthicknessesforuseascushioningmaterial.1.2Itisprimarilyintendedforusewhenitisnecessarytominimizethepossibilityoftarnishingorsurfacecorrosionofsilver,copperandcopperalloyswithwhichitmaybeincontactorincloseproximity.NOTE1:Therubbersheetisnotresistanttominerallubricatingoilsorpetroleumfuelsandithashighwaterretainingproperties.NOTE2:Ifstoredforlongperiodsattemperaturesbelowapproximately5°Ccrystallizationmayoccurgivingrisetostiffeningofthematerial.Thiseffectismostrapidintheregionof-25°C.Asufficientincreaseinthestoragetemperaturereversesthiseffect.NOTE3:ThisDefenceStandardhasnorequirementforfireretardancyandthematerialmayburnreadily.2WARNINGThisStandardcallsfortheuseofsubstancesand/orproceduresthatmaybeinjurioustohealthifadequateprecautionsarenottaken.Itrefersonlytotechnicalsuitabilityandinnowayabsolveseitherthesupplierortheuserfromstatutoryobligationsrelatingtohealthandsafetyatanystageofmanufactureoruse.3RelatedDocuments3.1ReferenceismadeinthisStandardto:BS1384PhotographicDensityMeasurementsBS4443MethodsofTestforFlexibleCellularMaterialsPart1Methods1to6Part6Method14PreparationofWaterExtract3.2ReferenceinthisStandardtoanyrelateddocumentsmeansinanyinvitationtotenderorcontracttheeditionandallamendmentscurrentatthedateofsuchtenderorcontractunlessaspecificeditionisindicated.3.3CopiesofBritishStandardsandinformationregardingcurrenteditionsmaybeobtainedfromthefollowingaddress:DOCUMENTSOURCEBritishStandardsBritishStandardsInstitutionSalesDepartmentLinfordWoodMILTONKEYNESMK146LE34InformationtobeSuppliedbythePurchaserDEFSTAN93-41/2Thepurchasershallstateclearlyinhisorderthesizeofsheetandnominalthicknessrequired.5Description5.1Thematerialshallbegreycellularrubberinwhichthecellsaresubstantiallyintercommunicating.Itshallbesuppliedintheformofsheetsofsubstantiallyuniformthickness.Dependingonthickness,thesheetsmayhaveasmooththinskinononeorbothsurfaces,ornoskinoneithersurface.Thesurfacesmayhaveaclothmarkfinishsuchasthatresultingfromtheimprintofcloselywovenfabricofnotlessthan60endsandpicksper25mm.5.2Eachsheetshallbesubstantiallyuniformintextureandshallbefreefromflaws,holesorotherimperfectionslikelytoaffectitsservicelifeorutility.Occasionalshallowsurfacedefectsproducedbyweavingfaultsinthefabricusedduringmanufactureshallnotberegardedasacauseforrejection.Thicknessabove25mmmaybesuppliedconsistingoftwoormorethicknessesbondedtogetherwithasuitableadhesive.SuchpliedmaterialshallcomplyfullywithalltherelevantrequirementsofthisStandard.6CompositionThematerialshallbemadefromsuitablycompoundedlatexofcis-polyisopreneorstyrene-butadienerubberorablendofthetwousingasulphurlessorsulphur–donatingcuringsystem,anditshallcontainnotlessthanonepartbymassperhundredpartsofrubberofasuitablenon-stainingantioxidant.7DimensionsEachsheetshallcomplywiththefollowingrequirements:(a)ThethicknesswhenmeasuredinaccordancewithBS4443:Part1Method1,shall(b)Thelength