1、Designation: D 1338 99 (Reapproved 2005)Standard Practice forWorking Life of Liquid or Paste Adhesives by Consistencyand Bond Strength1This standard is issued under the fixed designation D 1338; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practic
3、e covers two procedures applicable to alladhesives having a relatively short working life. It is intendedto determine whether the working life conforms to the mini-mum specified working life of an adhesive required byconsistency tests or by bond strength tests, or by both.1.2 The values stated in SI
4、 units are to be regarded as thestandard. The values given in parentheses are for informationonly.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
5、 practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 897 Test Method for Tensile Properties of AdhesiveBondsD 906 Test Method for Strength Properties of Adhesives inPlywood Type Construction in Shear by Tension LoadingD 907 T
6、erminology of AdhesivesD 1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D 1084 Test Methods for Viscosity of Adhesives3. Terminology3.1 DefinitionsMany terms in this practice are defined inTerminology D 907.3.2 D
7、efinitions of Terms Specific to This Standard:3.2.1 working life of an adhesive, nthe time elapsingbetween the moment an adhesive is ready for use and the timewhen the adhesive is no longer usable.4. Significance and Use4.1 To determine acceptable working life of an adhesive,two procedures are used.
8、 This practice is intended to apply to:4.1.1 Self-contained liquid or paste adhesives,4.1.2 Adhesives requiring addition of a catalyst, hardener,filler, thinner, and so forth, or combinations of two or more ofthese materials just prior to use, and4.1.3 Powdered or flaked adhesives which are dissolve
9、d inwater or other solvent and are used as liquid or paste adhesives.CONSISTENCY PROCEDURE5. Apparatus5.1 ViscometerAny means of measuring the viscosity orconsistency of the adhesive can be selected, provided that it issuitable for the type of adhesive under test and provided thatthe results can be
10、expressed in fundamental units.5.2 Controlled-Atmosphere ChamberProvide an atmo-sphere of 23 6 1.1C (73.4 6 2F) and 50 6 2 % relativehumidity. Alternative controlled conditions are permissible,provided the conditions are agreed upon by the purchaser andthe manufacturer.5.3 Beaker, of heat-resistant
11、glass,376 mm (3 in.) indiameter, 102 mm (4 in.) high, and having a capacity of 400mL.5.4 Stirring Rod, of glass, stainless steel, or other unreactivematerial.6. Procedure6.1 Conduct the consistency test on both the adhesive whenfreshly prepared and on the adhesive after having beensubjected to the w
12、orking life test.NOTE 1An alternative test method to be used with this practice is TestMethods D 1084.6.2 Precondition the adhesive and all the components at atemperature of 23 6 1.1C (73.4 6 2F), unless otherwiseagreed upon between the purchaser and the manufacturer.6.3 Start the test when the adhe
13、sive and all the componentsare at a temperature of 23 6 1.1C (73.4 6 2F), unless1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.10 on Working Properties.Current edition approved April 1, 2005. Published April 2005. Origi
14、nallyapproved in 1954. Last previous edition approved in 1999 D 1338 99.2For referenced ASTM standards, 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 AS
15、TM website.3Borosilicate glass is suitable for this purpose.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.otherwise agreed upon between the purchaser and the manu-facturer. If the adhesive consists of two or more components,blend t
16、he components in accordance with instructions of themanufacturer, and again adjust the temperature to 23 6 1.1Cif required. Immediately after mixing a 200-mL (or equivalentweight) sample of the adhesive, place the prepared adhesive inthe 400-mL beaker.6.4 Record the time at the moment the adhesive i
17、s placed inthe beaker and is ready for use. Unless otherwise agreed uponbetween the manufacturer and the user, keep the beakeruncovered throughout the test. After a 10-min interval haselapsed, place a glass stirring rod (6 mm (14 in.) in diameterand long enough to be handled conveniently in the cent
18、er of thebeaker touching the bottom of the beaker. Rotate the glass rodin this position with a spiral motion, moving outwardlytowards the wall of the beaker.6.5 Make five complete revolutions at a rate of one revolu-tion per second. At the end of this operation, allow the stirringrod to rest in the
19、beaker. Permit a period of 10 min to elapsebefore repeating the stirring operation. The number of cycles(10-min rest period and 5-s stirring) to be performed willdepend on the type of adhesive under test. For most adhesives,about 6 cycles will be required.Alternate stirring times and restperiods can
20、 be used, provided the conditions are agreed uponbetween the purchaser and the manufacturer. Record the timeat which the last 5-s stirring operation is completed.6.6 At the end of any number of stirring cycles agreed uponbetween the purchaser and the manufacturer, test the samplesfor consistency.7.
21、Report7.1 Report the following information:7.1.1 Complete identification of the adhesive, includingtype, source, manufacturers code number, form, date of test,date of manufacture, and the mixing proportions followed inpreparing the adhesive for use,7.1.2 Complete identification of the viscometer and
22、 detailsof the test procedure, or the ASTM test method used,7.1.3 Number of cycles (10-min rest period and 5-s stirring)performed, and total time elapsing from start to finish of thisoperation.7.1.4 Consistency results on both the freshly received andworked adhesives, and7.1.5 Pertinent observations
23、 such as settling, discoloring,separating, caking, or gelling which might influence theusability of the adhesive.BOND STRENGTH PROCEDURE8. Apparatus8.1 Testing Machine, of suitable capacity, capable of main-taining a specified rate of loading, and equipped with self-aligning grips for holding the t
24、est specimens.8.2 Controlled Atmosphere ChamberProvide a tempera-ture of 23 6 1.1C (73.4 6 2F) and 50 6 2 % relativehumidity for these tests. Alternative controlled conditions arepermissible, provided the conditions are agreeable to thepurchaser and the manufacturer.9. Procedure9.1 Conduct the bond
25、strength test on both the adhesivewhen freshly prepared and on the adhesive after having beensubjected to the working-life test.9.2 Prepare and blend the adhesive in accordance with 6.2,6.3, 6.4, and 6.5.9.3 At the end of any number of stirring cycles agreed uponbetween the purchaser and the manufac
26、turer, employ thesamples to prepare bond-strength specimens as described inSection 10.10. Preparation of Test Specimens10.1 Prepare test panels or sheets for determining the bondstrength of the adhesive in accordance with any of the ASTMtest methods suitable for the purpose. For example, use thelap-
27、type shear specimens or the spool-type tensile specimenssuch as those described in Test Methods D 897, D 906, andD 1002.10.2 In preparing the test specimens, use the adhesive inaccordance with the instructions of the manufacturer. Preparetest specimens for bond strength for both the original adhesiv
28、eas received and for the adhesive which has been subjected tothe working-life test, using the same procedure and conditionsof bonding.11. Report11.1 Report the following information:11.1.1 Complete identification of the adhesive includingtype, source, manufacturers code number, form, date of test,da
29、te of manufacture, and the mixing proportions followed inpreparing the adhesive for use,11.1.2 Complete identification of the adherends used, in-cluding the method of cleaning, the manner of applying theadhesive, the curing treatment, all other pertinent bondingconditions, and the ASTM test methods
30、used,11.1.3 Number of cycles (10-min rest period and 5-s stir-ring) performed, and total time elapsing from start to finish ofthis operation.11.1.4 Bond strength test results on both the freshly re-ceived and worked adhesives, and11.1.5 Pertinent observations, such as settling, discoloring,separatin
31、g, caking, or gelling which might influence theusability of the adhesive.12. Precision and Bias12.1 Both the Consistency Procedure and the Bond StrengthProcedure are dependent upon the precision and bias of the testmethod chosen.13. Keywords13.1 adhesive; bond strength; consistency; working lifeD 13
32、38 99 (2005)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 infringement of suc
33、h 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 or for addit
34、ional 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 known to the
35、 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 1338 99 (2005)3
