1、Designation:D308997(Reapproved 2008)Standard Practice forDetermining the A-D Dimension of Aerosol Valve Dip Tubes1This standard is issued under the fixed designation D3089;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of l
2、ast 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 practice covers the rapid determination of the A-Ddimension defined as the centerline dimension from the topplane of th
3、e valve mounting cup curl to the far end of the diptube.2See Fig.1.1.2 This practice is limited to valves with 1-in.(25.4-mm)mounting cups.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided
4、 for information onlyand are not considered standard.2.Significance and Use2.1 Using dip tubes of the correct length is helpful byenabling the user to discharge essentially all the product fromthe dispenser,preventing the tube from becoming jammed intoan incorrect position as a result of gassing,pre
5、venting the(non-dimpled)valve cup from excessively protruding from thecan plug and perhaps causing production problems at thecrimper or gasser/crimper,and preventing the tube frombottoming on the flat base of some aluminum cans in such away that a seal is made that will act to limit or stop the entr
6、yof product into the tube when the valve is actuated.2.2 Dip tubes that extend fully to the bottom of thedispenser,without excessive distortion,can also aid in retain-ing their connection to the valve body tailpiece,which may beimportant if the aerosol content exerts a very significantswelling actio
7、n upon the dip tube plastic.2.3 The choice ofA-D dimension is influenced by a numberof factors.These factors include:2.3.1 Tube curvature,which may vary considerably betweentubes.2.3.2 Variation of valve cup and valve cup gasket thickness.2.3.3 Elevation or suppression of the valve pedestal(thustop
8、end of the dip tube)upon crimping.2.3.4 Elevation of valve pedestal during hot-tanking,onlypartly diminished upon subsequent cooling.2.3.5 Swelling(or shrinking)action of the product on thedip tube.3.Apparatus3.1 Gage for Measuring AD dimension,or equivalentThisdevice consists of three machined part
9、s.In addition,a scalegraduated in132in.(ruler)is glued to the scale block,and afoam pad base may be added to achieve nonslip characteristics.4.Calibration and Standardization4.1 Ensure that the reference plane against which the top ofthe valve cup rests is at zero on the scale.5.Procedure35.1 Hold t
10、he gage of Figs.2-6 in the hand or on a flatsurface,and insert the valve,placing the actuator/stem end tothe higher end of the device.The slide bar is then pushed firmlyto the left to seat the mounting cup against the base end.5.2 The reading is then taken off the scale at the end of thedip tube,giv
11、ing the“A-D Dimension.”6.Report6.1 Report the following information:6.1.1 All details concerning the valve being tested,such aslot number,date received,supplier,and product for which it isintended.6.1.2 The A-D dimension specification.6.1.3 Measurement to the nearest132in.(0.80 mm).7.Precision7.1 Re
12、sults may vary due to the subjectiveness of theoperator touch and technique,gage type and gage accuracy,asshown by limited repeatability and reproducibility studies.7.2 Attempts to develop a precision statement have not beensuccessful.For this reason,data on precision cannot be given.1This practice
13、is under the jurisdiction of ASTM Committee D10 on Packagingand is the direct responsibility of Subcommittee D10.33 on Mechanical Dispensers.Current edition approved Oct.1,2008.Published November 2008.Originallyapproved in 1972.Last previous edition approved in 2003 as D3089 97(2003).DOI:10.1520/D30
14、89-97R08.2This practice was originally developed by the Chemical Specialties Manufac-turers Assn.and is described in The Aerosol Handbook(Second Edition),MontfordA.Johnson,167 and 182,Mendham,N.J.,Wayne E.Dorland&Co.,1982.3This procedure has been approved by the CSMA,Aerosol Division CommercialStand
15、ards Committee,Subcommittee“C.”Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Keywords8.1 A-D dimension measurement in aerosol packaging;aerosol dip tube measurement;measurement of dip tubes inaerosol packagingFIG.1 Aerosol Valve“A-D”D
16、imensionFIG.2 Aerosol Valve Diptube Measurement GageFIG.3 Base Slide(material:114by 114by 1212)D3089 97(2008)2 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the r
