1.0ScopeThistestspecifiesastandardprocedureforesti-
matingtheparticlesizeandtheparticleshapeofsolderpow-
derinsolderpastesbymicroscopicmethods.
2.0ApplicableDocumentsNone
3.0TestSpecimen
1gramofsolderpaste
4.0Equipment/Apparatus
Thinner
Spatula
Beaker30ml
Microscope,magnification100times
Measuringocular,scaledivision10μm
Microscopeslides
Microscopeglasscoverslips
5.0Procedure
5.1Preparation
5.1.1Wait,ifnecessary,untilthesolderpasteisatroom
temperature.
5.2Test
5.2.1Homogenizethepastebystirringwiththespatula.
5.2.2Weighapproximately4gofthinner.
5.2.3Addapproximately1gofthesolderpaste.
5.2.4Stirwiththespatulauntilauniformmixturehasbeen
obtained.
5.2.5Applyasmalldroponthemicroscopeslide.
5.2.6Covertheslidewiththecoverslipandpressgentlyto
spreadoutthesmalldropbetweentheglasses.
5.2.7Measurewiththemicroscopethelengthandwidthof
theestimatedsmallestandlargestsolderpowderparticlesin
aviewingareaofapproximately50particles.(Photographs
maybeusedformeasuringand/orreferencepurposes).
5.2.8Estimatetheprincipleshapeoftheparticlesasspheri-
calornon-spherical.
5.3EvaluationExpressthemassesofthepowderabove,
within,andbelowthenominalsizerangeaspercentagesof
themassoftheoriginalsample.EnterdatainTable1.
Table1
Type1+150μm+75μm+20μm–20μm
Type2+75μm+45μm+20μm–20μm
Type3+45μm+25μm+20μm–20μm
Type4+38μm+20μm–20μm
Type5+30μm+15μm–15μm
Type6+15μm+5μm–5μm
TheInstituteforInterconnectingandPackagingElectronicCircuits
2215SandersRoad?Northbrook,IL60062
IPC-TM-650
TESTMETHODSMANUAL
Number
2.2.14.1
Subject
SolderPowderParticleSizeDistribution—
MeasuringMicroscopeMethod
Date
1/95
Revision
OriginatingTaskGroup
SolderPasteTaskGroup(5-24b)
MaterialinthisTestMethodsManualwasvoluntarilyestablishedbyTechnicalCommitteesoftheIPC.Thismaterialisadvisoryonly
anditsuseoradaptationisentirelyvoluntary.IPCdisclaimsallliabilityofanykindastotheuse,application,oradaptationofthis
material.Usersarealsowhollyresponsibleforprotectingthemselvesagainstallclaimsorliabilitiesforpatentinfringement.
EquipmentreferencedisfortheconvenienceoftheuseranddoesnotimplyendorsementbytheIPC.
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