1、Designation: D1338 99 (Reapproved 2016)Standard Practice forWorking Life of Liquid or Paste Adhesives by Consistencyand Bond Strength1This standard is issued under the fixed designation D1338; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、revision, the year 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This pract
3、ice 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
4、SI 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 heal
5、th practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D897 Test Method for Tensile Properties of Adhesive BondsD906 Test Method for Strength Properties of Adhesives inPlywood Type Construction in Shear by Tension LoadingD907 T
6、erminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D1084 Test Methods for Viscosity of Adhesives3. Terminology3.1 DefinitionsMany terms in this practice are defined inTerminology D907.3.2 Defi
7、nitions 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. Th
8、is 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 dissolved i
9、nwater 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 exp
10、ressed 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 gla
11、ss,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 work
12、ing life test.NOTE 1An alternative test method to be used with this practice is TestMethods D1084.1This 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 May 1, 2016. Published M
13、ay 2016. Originallyapproved in 1954. Last previous edition approved in 2011 as D1338 99 (2011).DOI: 10.1520/D1338-99R16.2For 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
14、 to the standards Document Summary page onthe ASTM website.3Borosilicate glass is suitable for this purpose.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Precondition the adhesive and all the components at atemperature of 23 6 1
15、.1C (73.4 6 2F), unless otherwiseagreed upon between the purchaser and the manufacturer.6.3 Start the test when the adhesive and all the componentsare at a temperature of 23 6 1.1C (73.4 6 2F), unlessotherwise agreed upon between the purchaser and the manu-facturer. If the adhesive consists of two o
16、r more components,blend the 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
17、the moment the adhesive is 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
18、 conveniently in the center 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 st
19、irringrod to rest in the 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
20、times and restperiods can 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 s
21、amplesfor consistency.7. 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 identificat
22、ion of the viscometer and 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
23、.5 Pertinent observations, 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-alignin
24、g grips for holding the test 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. Proce
25、dure9.1 Conduct the bond 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
26、purchaser and the manufacturer, 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.
27、 For example, use thelap-type shear specimens or the spool-type tensile specimenssuch as those described in Test Methods D897, D906, andD1002.10.2 In preparing the test specimens, use the adhesive inaccordance with the instructions of the manufacturer. Preparetest specimens for bond strength for bot
28、h the original adhesiveas 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,
29、 form, date of test,date 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
30、the ASTM test methods 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,
31、 discoloring,separating, 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; consist
32、ency; working lifeD1338 99 (2016)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 risko
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35、ur views known 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 co
36、ntacting 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). 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:/ 99 (2016)3
