1、Designation: D3089 97 (Reapproved 2017)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 yea
2、r 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 top
3、plane 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 tha
4、t 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 resul
5、t 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 lim
6、it 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 sig
7、nificantswelling 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 th
8、e 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, or equivalentThisdevice
9、 consists of three machined parts. In addition, a scalegraduated in132 in. (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 z
10、ero on the scale.5. Procedure35.1 Hold the 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
11、 off the scale at the end of thedip tube, giving 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 Measurem
12、ent to the nearest132 in. (0.80 mm).7. Precision7.1 Results 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
13、 reason, data on precision cannot be given.1This practice is under the jurisdiction of ASTM Committee D10 on Packagingand is the direct responsibility of Subcommittee D10.33 on Aerosol Products.Current edition approved Feb. 1, 2017. Published March 2017. Originallyapproved in 1972. Last previous edi
14、tion approved in 2008 as D3089 97(2008).DOI: 10.1520/D3089-97R17.2This 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 measu
15、rement; measurement of dip tubes inaerosol packagingFIG. 1 Aerosol Valve “A-D” DimensionFIG. 2 Aerosol Valve Diptube Measurement GageFIG. 3 Base Slide (material: 114 by 114 by 1212)D3089 97 (2017)2ASTM International takes no position respecting the validity of any patent rights asserted in connectio
16、n 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 responsible
17、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 or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consid
18、eration 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 known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Bar
19、r 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 websit
20、e(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 4 Slide Bearing (material thickness: 0.020)FIG. 5 Indicator Blade (material thickness: 0.015)FIG. 6 Slide (material: 1 by 1 by12)D3089 97 (2017)3
