ASTM_D_3523_-_92_2012.pdf

Designation:D352392(Reapproved 2012)Standard Test Method forSpontaneous Heating Values of Liquids and Solids(Differential Mackey Test)1This standard is issued under the fixed designation D3523;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the non-adiabatic determinationof the spontaneous heating values(SHV)of liquids and solids.It is applicable to substances that are not completely volatile atthe test temperature.Spontaneous heating values obtained bythis test method are qualitative indications of the degree ofself-heating that may be expected to occur upon exposure ofthe sample to air at the test temperature.1.2 Values obtained by this method are applicable to liquidsand solids supported on cellulosic surfaces.They are notapplicable to liquids on metal surfaces,on contaminatedsurfaces,or at pressures above atmospheric.1.3 Spontaneous heating values determined by the presenttest method are regarded only as qualitative measurements ofself-heating which occurs under the conditions of the test.Thetest method does not purport to produce a quantitative measureof the enthalpy of reaction of the sample with air at a given testtemperature.Such data can be obtained by the use of anadiabatic calorimeter.The existence,under the test conditions,of a positive temperature difference between the sample andthe reference is evidence of a thermochemical reaction in thesample.1.4 The magnitude of the measured temperature differenceis a semiquantitative indication of the enthalpy and rate of thatreaction.Since factors such as heat loss from the sample to thebath and quenching of the reaction due to too rapid consump-tion of oxygen affect the amount and duration of the measuredheat effect,care must be taken not to attribute too muchquantitative significance to the test results.It is sufficient,forthe purpose of this test,to determine whether or not the sampleis capable of undergoing a self-heating reaction of sufficientmagnitude and rapidity to produce a detectable thermal effect.The spontaneous heating value(SHV)can be lower than thetest temperature.A negative result does not preclude sponta-neous heating initiating at a temperature higher than the testtemperature.1.5 This standard should be used to measure and describethe response of materials,products,or assemblies to heat andflame under controlled conditions and should not be used todescribe or appraise the fire-hazard or fire-risk of materials,products,or assemblies under actual fire conditions.However,results of this test may be used as elements of a fire-hazardassessment or a fire-risk assessment which takes into accountall of the factors which are pertinent to an assessment of the firehazard or fire risk of a particular end use.1.6 The values stated in SI units are to be regarded as thestandard.In cases where materials,products or equipment areavailable in inch-pound units only,SI units are omitted.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent Water3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 spontaneous heating value(SHV)the maximumamount by which the temperature of the sample exceeds that ofthe reference when exposed at a given temperature in thestandard apparatus.3.2 Symbols:tS=temperature of sample side at any time during test,K,tR=temperature of reference side at time tSis measured,K,1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.07 on Engineering Sciences of High Performance Fluids andSolids(Formally D02.1100).Current edition approved April 15,2012.Published April 2012.Originallyapproved in 1976.Last previous edition approved in 2007 as D352392(2007).DOI:10.1520/D3523-92R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TS=maximum temperature of sample chamber duringtest,K,TR=temperature of reference chamber measured at sametime that TSis measured,K,t=tS tR,T=TS TR,BR=equilibrium temperature of reference side duringblank run,K,BS=equilibrium temperature of sample side during blankrun,K,TB=BS BR=instrumental blank,tC=t (BS BR)=t TB,andTC=T (BS BR)=