1、Designation:E104300(Reapproved 2010)Standard Specification forPipets,Milk and Cream Examination1This standard is issued under the fixed designation E1043;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers miscellaneous pipets suitablefor use in milk and cream testing procedures.1.2 The values stated in SI units are to b
3、e regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2E542 Practice for Calibration of Laboratory VolumetricApparatusE671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE920 Spe
4、cification for Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo-ratory Apparatus for United States Government Procure-mentsE1157 Specification for Sampling and Testing of ReusableLaboratory Gl
5、assware3.Classification3.1 Pipets covered by this specification shall be of thefollowing types:3.1.1 Type 1Breed and brew pipet.3.1.2 Type IIMilk pipet,Babcock.3.1.2.1 Type II AMilk pipet,Babcock variation.3.1.2.2 Type II BMilk pipet,Babcock variation.3.1.3 Type IIICream pipet.3.1.3.1 Type III ACrea
6、m pipet,additional size.3.1.4 Type IVMilk diluting pipet.3.1.4.1 Type IV AMilk diluting pipet,additional sizes.3.1.5 Type VMilk diluting pipet.3.1.6 Type VIMilk pipet,Gerber.4.Material and Annealing4.1 Pipets shall be made of high quality apparatus glass,suitable in all respects for the purpose inte
7、nded.4.2 Maximum residual thermal stress shall conform toSpecification E671.5.Style and Design5.1 Type I,Breed and Brew Pipet(see Note 1)Style anddesign of capillary pipets shall be in strict conformance withFig.1,Type I.Pipets shall be without bulb,and shall besuitable for use in the direct count m
8、ethod of milk examinationin conformance with the test procedures described in the 14thedition of Standard Methods for the Examination of DairyProducts3for pipet and slide method.The pipet shall becalibrated to deliver,when blown out,0.01 6 0.001 cm3ofmilk having a specific gravity of 1.032 at 20C.Ti
9、ps shall beblunt,ground,or polished to discharge milk cleanly.NOTE1Type I pipets(5.1),before being used in New York,must besubmitted to the Director of the State Ford Laboratory,Albany,NY,forexamination.5.2 Type II,Milk PipetMilk pipets shall be Babcock pipetssuitable for testing the butter fat cont
10、ent of milk.The ends shallbe at right angles to the axis.The bulb shall be symmetrical.The tip shall taper slightly over the terminal 5 to 20 cm3,butthe inside diameter at the end must be able to deliver within 5to 8 s when filled with water.The end shall be fire-polished.The pipet shall be calibrat
11、ed to contain 17.6 6 0.05 cm3ofwater at 20C,when tested in accordance with Practice E542.The pipet shall be marked to indicate that it contains 17.6 cm3at 20C.The pipet shall be in strict conformance with Fig.1,Type II.5.2.1 Type II A,Milk PipetSame as Type II(5.2)exceptmarked“Sealed”for use in stat
12、es requiring this specialmarking.(Alabama,Georgia,Mississippi,New Mexico,NorthDakota,Oregon,Tennessee,Washington,and Wisconsin.)5.2.2 Type II B,Milk PipetSimilar to Type II,however,thepipet shall be calibrated to deliver 17.6 6 0.05 cm3of water at1This specification is under the jurisdiction of ASTM
13、 Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onApparatus.Current edition approved July 1,2010.Published July 2010.Originally approvedin 1985.Last previous edition approved in 2005 as E1043 00(2005).DOI:10.1520/E1043-00R10.2For referenced ASTM standard
14、s,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.3American Public Health Assoc.,Standard Methods for the Examination ofDairy Products,14th editi
15、on.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 20C,when tested in accordance with Practice E542.The pipetshall be marked to indicate that it delivers 17.6 cm3at 20C.The pipet shall be in strict conformance with Fig.1,Type II.(For use
16、in the state of Nebraska.)5.3 Type III,Cream PipetCream pipets shall be in strictconformance with Fig.1,Type III.They shall be calibrated todeliver 9 6 0.10 cm3at 20C,using distilled water,with dropremaining in tip blown out 2 s after delivery ceases and addedto free delivery volume.5.3.1 Type III A,Cream PipetSimilar to Type III,however,the pipet shall be calibrated to deliver 18 6 0.20 cm3at 20Cwhen used as described in 5.3.The pipet shall conform withFig.1,Type III A.5.4 Type IV,Milk Diluting