1、Designation:D420292AnAmericanNationalStandardStandardTestMethodforThermalStabilityofPoly(V inylChloride)(PVC)Resin1Thisst a ndar disissuedundert hefixeddesignationD4202;t henum berim m ediat elyfollowingt hedesignat ionindicat est heyearoforiginaladopt ionor,int heca seofrevision,t heyearoflastr evi
2、sion.Anum berinpar enthesesindicat est heyea roflastreapproval.Asuperscriptepsilon(e)indica t esanedit or ialchangesincet helastrevisionorreapproval.1.Scope1.1Thist estm et hodcoverst hedet erm ina t ionoft het herm a lst a bilit yofpoly(vinylchloride)(PVC)resins.1.2Asea cht ypea ndqua ntit yofst a
3、bilizerwillha veadifferenteffectont herm a lst a bilit yofva riousresins,t hist estm et hodisnotint endedt opredictt het herm a lst a bilit yofagivenresininagivencom pound.However,itma ybeusefulinqua lit ya ssura nceorin-pla ntqua lit ycont rolt est ing.1.3Thist estm ethodha snotbeenva lida t edforP
4、VCcom pounds.1.4Th i sstan darddoesn otpurporttoaddressallofthesafetyproblems,i fan y,assoc i atedw i thi tsuse.Iti stherespon si bi li tyofth euserofth i sstan dardtoestabli shappro-pri atesafetyan dh ealthprac ti c esan ddetermi n eth eappli c a-bi li tyofregulatoryli mi ti ti on spri ortouse.NOTE
5、1Ther ear enoISOstandar dscover ingthepr ima r ysubjectofthisAST Mstandar d.2.Refer encedDocument s2.1ASTMStan dards:D883Term inologyR ela t ingt oPla st ics2D1600Term inologyforAbbrevia t edTerm sR ela t ingt oPla st ics23.Terminology3.1D efin i ti on s:Definitionsa reina ccorda ncewit hTerm i-nolo
6、giesD883a ndD1600unlessot herwiseindica t ed.3.2D efin i ti on sofTermsSpec i fictoTh i sStan dard:3.2.1th ermalstabi li ty t het im eela psedfromt hem om enta twhicht heresinisexposedt ot het estt em per a t ureunt ilt hefirstsignofevolut ionofhydrogenchloride(decom posit ion)byindica t orpa percol
7、orcha nge.4.SummaryofTestMet hod4.1Thesa m pleofpowderorgra nula rist est eda tt het estt em pera t ureinst illa ir,a ndt het im e,requiredfort hehydrogenchloridet ha tissplitofftocha nget hecolorofcongo-redpa perpla ceda bovethespecim en,ism ea sured.5.SignificanceandUse5.1Thesplit t ingoffofhydrog
8、enchlorideisoneoft heea rliestindica t ionsofdecom posit ionofPVC;itist heprecur-sorofdiscolora t iona ndot herdegra da t ionphenom ena.6.Apparat us6.1Con goR edIn di c atorPaper,6-m mwideby50-m mlongst rips(suppliedinst opperedpla st icvia ls).6.2Ti mi n gD evi c e,ca libra t edinm inut esa ndsecon
9、ds,ha vingam inim umra ngeof60m in.6.3O i lB ath,fit t edwit hst irrera ndt herm ost a t iccont rol,ca pa bleofm a int a iningt het em pera t urewit hin61Cint hera ngeof120t o210C.Theba t hisfit t edwit hcla m psca pa bleofholdingt estt ubesim m ersedt oadept hof50m m.6.4TestTubes,18by150-m m.6.5Sma
10、llGlassTubes,2t o3-m mininsidedia m et era nd100625m minlengt h.6.6Stopper,t ofitt het estt ubes.Aholeisboredint hest oppert oa ccom m oda t et he2t o3-m msm a llgla sst ubes.6.7SeeFig.1fora ssem blyoft het ube,sa m ple,a ndindica t orpa per.7.Pr ocedur e7.1Con di ti on i n gMa int a int hesa m plea
11、 troomt empera-t urefora tlea st2h.7.2Hea tt heoilba t ht ot het estt empera t urea ndm a int a initt o61C.Thepreferredt em pera t ureis150C,but130Cm a ybeusedforresinsha vingashortst a bilit yt im ea nd180Cforresinsha vingalongst a bilit yt im e.7.3Pla ceenoughoft hesa m pleoft heresininat estt ube
12、t ofillt het ubet oadept hof5062m m.Gent lysha k eort a pt hem a t eria ldown,t a k ingca renott oformacom pa ctm a ss.7.4Pla cet hesm a llgla sst ubeint heholeint hest opper.Thet ubeshouldext endfromt het opa ndbot t omoft hest opper.R olloneendofast ripofcongoredindica t orpa pera ndinsertitint ot
13、 hegla sst ubesot ha t3062m moft hepa perst ripext endsfromt hegla sst ube.Pla cethest opperint het estt ubecont a iningt hesa m ple.Posit iont hegla sst ubeint hest oppersot ha tt heendoft hepa peris2562m ma bovet het opoft heuppersurfa ceoft hesa m ple(seeFig.1).7.5Im m erset het ubet husprepa red
14、int heoilba t h(st a bi-lizeda tt hedesiredt empera t ure)t ot heleveloft heuppersurfa ceoft hesa m ple.7.6Mea suret het im einsecondsfromt hem om entt het est1Thistestm et hodisundert hejurisdict ionofASTMCom m it t eeD-20onPlast icsandist hedir ectr esponsibilit yofSubcom m it t eeD20.15onTherm op
15、last icMat er ials(SectionD20.15.18).Curr entedit iona ppr ovedAug.14,1992.PublishedOctober1992.Or iginallypublishedasD420282.Lastpreviousedit ionD420282(1987)e1.2An n ualB ookofASTMStan dards,Vol08.01.1AMERICANSOCIETYFORTESTINGA NDMATERIALS100BarrHarborDr.,WestConshohocken,PA19428Reprint edfromtheA
16、nnualBookofASTMStandards.CopyrightA STMNOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.Downloaded/printed byUniver sit y of Edinbur gh(Universit y of Edinburgh)pursuant t o License Agreem ent.No fur t her repr oduct ions aut horized.t ubeisimm ersedint hehotoilt ot het im ewhent heindica t orpa pershowst hefirstdefinit ivecolorcha nge.Ta k ea st heend-pointt hea ppea ra nceofadefinit
