1、Designation: D 3089 97 (Reapproved 2008)Standard Practice forDetermining the A-D Dimension of Aerosol Valve Dip Tubes1This standard is issued under the fixed designation D 3089; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear 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 practice covers the rapid determination of the A-Ddimension defined as the centerline dimension from the t
3、opplane of the 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 t
4、hat are provided 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 res
5、ult of gassing, preventing 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 l
6、imit or stop the entryof 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 s
7、ignificantswelling action upon the dip tube plastic.2.3 The choice of A-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
8、the valve pedestal (thustop 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, Figs. 2-6 orequivalen
9、tThis device consists of three machined parts. Inaddition, a scale graduated in132 in. (ruler) is glued to the scaleblock, and a foam pad base may be added to achieve nonslipcharacteristics.4. Calibration and Standardization4.1 Ensure that the reference plane against which the top ofthe valve cup re
10、sts is at zero on the scale.1This practice 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 ap
11、proved in 2003 as D 3089 97(2003).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 aerosol dip tube measurement; measurement of dip tube
12、s inaerosol packaging3This procedure has been approved by the CSMA,Aerosol Division CommercialStandards Committee, Subcommittee “C”.FIG. 3 Base Slide (material: 114 by 114 by 1212)FIG. 4 Slide Bearing (material thickness: 0.020)FIG. 5 Indicator Blade (material thickness: 0.015)FIG.6Slide(material:1b
13、y1by12)D 3089 97 (2008)2ASTM 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 infringe
14、ment of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard o
15、r for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views k
16、nown to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 3089 97 (2008)3
