ASTM_F_180_-_94_2015.pdf

Designation:F18094(Reapproved 2015)Standard Test Method forDensity of Fine Wire and Ribbon Wire for ElectronicDevices1This standard is issued under the fixed designation F180;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of,to anaccuracy of 1.0%,the density of fine wires ranging from 0.25to 0.02 mm in diameter,or ribbons of similar thicknesses,forelectronic devices.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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.Specific hazardstatements are given in Section 4.2.Terminology2.1 Definitions:2.1.1 densitythe weight per unit volume,expressed ingrams per cubic centimetre,in accordance with the followingequation:5 W/Vwhere:=density of the specimenW=weight of the specimen,g,andV=volume of the specimen,cm3.3.Apparatus3.1 BalanceA suitable chemical balance capable of beingread to 0.1 mg.3.2 Micrometer,capable of being read to 0.002 mm.3.3 Standard Volume CylinderA cylinder of standard vol-ume made from corrosion-resistant material such as nickel,cylindrical in shape to within 0.0025 mm and of uniformdiameter and length.The length of the cylinder shall beapproximately the same as the diameter and about 12.7 to 25.4mm.The surface of the cylinder shall be smooth and free fromdefects,pits,or cracks.The corners of the cylinder shall not berounded.3.4 Thermometer,capable of being read to 0.2C within therange from 10 to 35C.3.5 Vacuum Pump and Desiccator A vacuum pump ca-pable of producing a vacuum of 0.1 mm Hg and a vacuumdesiccator.3.6 Hook suspended by a fine wire about 0.08 mm indiameter,both made of corrosion-resistant material,for sup-porting the test specimen while weighing it in the liquid.3.7 Cradle suspended by a fine wire about 0.08 mm indiameter,both made of corrosion-resistant material,for sup-porting the standard volume cylinder while weighing it in thetest liquid.4.Test Liquid4.1 The test liquid in which the test specimen and standardvolume cylinder are to be immersed while being weighed shallbe pure,stable,and shall have a low viscosity,low surfacetension,low vapor pressure and a density of not less than 2g/cm3.Tetrabromoethane and tribromomethane have beenfound satisfactory for this purpose.4.2 Precaution2These liquids are moderately toxic andshould only be used by those familiar with the hazardsinvolved.4.2.1 Tests should be carried out under a fume hood.Thefluids used should be considered potentially dangerous.4.2.2 HazardWhen treated,highly toxic fumes are givenoff.Prolonged inhalation can cause unconsciousness.4.2.3 TreatmentFresh air;artificial respiration if uncon-scious;oxygen if required.5.Test Specimen5.1 The preferred length of wire or ribbon required for thetest specimen shall be such that the volume is approximately0.5 cm3.The use of a specimen of less than 0.2 cm3is notrecommended.1This test method is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials,Wire Bonding,and Flip Chip.Current edition approved July 1,2015.Published September 2015.Originallyapproved in 1943 as B180 43 T.Last previous edition approved in 2010 asF180 94(2010)1.DOI:10.1520/F0180-94R15.2See Sax,N.I.,Handbook of Dangerous Materials,1951.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Preparation of Specimen6.1 The wire or ribbon shall be wiped and loosely woundinto a small coil and bound with wire of the same compositionin such a manner that no loose ends project from the body ofthe coil in order to produce a compact coil sufficiently looselywound to permit penetration of the test liquid upon immersion.The test specimen shall be thoroughly cleaned of lubricants bywashing or boiling in suitable solvents and thoroughly dryingin an oven.7.Procedure7.1 Weigh the test specimen in air to the nearest 0.1 mg.Pour sufficient test liquid into a beaker to completely covereither the test specimen or the standard volume cylinder(see7.4)when suspended by their respective supports in the liquidfor weighing(Note 2).Immerse the specimen in the liquid,andplace the beaker containing the specimen entirely submerged inthe vacuum desiccator.The vacuum produced by the pumpshall be sufficient to bring the liquid to a slow boil at roomtemperature and the boiling shall be continued for 10 to 15min.During this boiling period,jar or tap the desiccator inorder to