Designation:D440−07(Reapproved2012)StandardTestMethodofDropShatterTestforCoal1ThisstandardisissuedunderthefixeddesignationD440;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodofdropshattertest2coversthedeter-minationoftherelativesizestabilityanditscomplement,thefriability,ofsizedcoal.Itaffordsameansofindicatingtheabilityofcoaltowithstandbreakagewhensubjectedtohandlingatthemineandduringtransittotheconsumer.Thetestmethodisserviceableforascertainingthesimilarityofcoalsinrespecttosizestabilityandfriabilityratherthanfordeterminingvalueswithinnarrowlimitsinordertoemphasizetheirdissimilarity.Thistestmethodisconsideredapplicablefortestingaselectedsinglesizeofdifferentcoals,fortestingdifferentsinglesizesofthesamecoal,andformixedsizesofthesameordifferentcoals.NOTE1—Bysinglesizesismeantthosewithfixedupperandlowersieveopeninglimits,selectedfromthosedesignatedin4.2;andbymixedsizesismeanteither“slack”oramixtureoftwoormoresinglesizes.1.2Thistestmethodappearsbestsuitedformeasuringtherelativeresistancetobreakageofthelargersizesofcoalwhenhandledinthinlayerssuchasfromloadertominecar,fromloadingboomtorailroadcar,fromshoveltochute,etc.Whileitmaynotbesowelladaptedformeasuringtheliabilitytobreakageofcoalwhenhandledinmass,asinunloadingopen-bottomcars,emptyingbins,etc.,itisbelievedthatthetestmethodwillservealsotoindicatetherelativesizestabilityofcompositesizesofcoalwhere,incommercialhandling,thesmallersizedpieceshaveacushioningeffectwhichtendstolessenthebreakageofthelargerpiecesofcoal.1.3Thevaluesstatedininch-poundunitsshallberegardedasthestandard.Massmaybeexpressedinmetricvalues.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpractice...
