Designation:D1644−01(Reapproved2017)StandardTestMethodsforNonvolatileContentofVarnishes1ThisstandardisissuedunderthefixeddesignationD1644;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodsdeterminethefractionofavarnishthatisnonvolatileatthetemperatureofthetestwhilevolatilesolventsaredrivenoff.Itissometimesanapproximatemeasureofthefilm-formingmatterinavarnish.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Foraspecificstatement,seeSection3.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SignificanceandUse2.1Thesetestmethodsareapplicabletovarnishandareusefultoproducersandusersindeterminingnonvolatilecontentandaresometimesanappropriatemeasureofthefilm-formingmatterinvarnish.3.Hazards3.1Sincetheflashpointsofsomeofthesolventsusedincoatingsandrelatedproductsarebelowthetemperatureofthetest,careshouldbeexercisedthatthelowerexplosivelimitsofthesolventsarenotexceeded.Theamountofsolventintheovenatmosphereatanyonetimewilldependonthenumberoftests(pans)intheoven,thepercentnonvolatileofthesamples,thesizeoftheoven,thetypeofoven(mechanicalorgravityconvection)andtheairchangesperhour.TESTMETHODA—3hAT105°C4.Procedure4.1Placeaportionofthethoroughlymixeds...
