Iratingsprovideameasureoftheignitabilityandflammabilitypropertiesofaproduct.TheIRatingtestsareutilisedwhenthedimensi***andthegeometricalformofthearticledonotpermitthesamplingofthetestpieces,whicharenecessaryforthedeterminationoftheMclassificationaccordingtodocumentationsheetP92-507.Thematerialissubjectedtothefollowingtwotestsforreactiontofire:·DeterminationoftheoxygenindexaccordingtoENISO4589Part2·GlowWireTestaccordingtotherequirementsofEN60695-2-11ENISO4589Part2(OxygenIndex)TestThisPartofENISO4589specifiesmethodsfordeterminingtheminimumconcentrationofoxygen,inadmixturewithnitrogenthatwillsupportcombustionof***allverticaltestspecimensunderspecifiedtestconditi***.Thetestisperformedatanambienttemperatureof23°C&plu***n;2°C.Theresultsaredefinedasoxygenindexvalues.Principle–A***alltestspecimenissupportedverticallyinamixtureofoxygenandnitrogenflowingupwa***throughatransparentchimney.Theupperendofthespecimenisignitedandthesubsequentburningbeh***iourofthespecimenisobservedtocomparetheperiodforwhichtheburningcontinues,orthelengthofthespecimenburnt,withspecifiedlimitsforsuchburning.Bytestingaseriesofspecimensindifferentoxygenconcentrati***,theminimumoxygenconcentrationisdetermined.EN60695-2-11–GlowWireTestThispartofENISO60695-2-11specifiesmethodstodeterminetheperformanceofamaterialinitsenduseformwhenitissubjectedtotheconditi***ofthetestspecifiedinEN60695-2-11:2001.Principle–A***allspecimenissubjectedtoaheatedglowingwireh***inga‘U’shape.Theglowingwireisheatedtoagiventemperatureandthenthetestspecimenisdrawntowa***itatagivenforce.Thewireisappliedforaperiodof30secondsandanumberofobservati***arerecorded.Thespecimenisc***ideredtoh***esatisfactorilywithstoodtheglow-wiretestifthereisnoignitionofthetestspecimenorifthereisignitionofthetestspecimen,theflamesmustceasewithintheallowedtimefollowingremovaloftheglowingwireandthereshallbenoignitionofthespecifiedlayerplacedbeneaththetestspecimen.CalculationofIrating.UtilisingtheguidancedetailedinSTM-S-001theIRatingofaproductisdeterminedbyassessingthetestresultsagainstthecriteriasetoutinthebelowtable.Table1ofNFF16-101ClassResultsoftestsOxygenIndexGlowWireI0I1I2I3I4NC(1)≥70≥45≥32≥28≥20<20NoIgnitionat960°CNoIgnitionat960°CNoIgnitionat850°CIgnitiondoesnotpersistat850°Cafterglowwireiswithdrawn.(1)NC:Non-classified)