1、Designation: D7149 05 (Reapproved 2011)1Standard Practice forDetermining the Freeze Thaw Stability of Adhesives1This standard is issued under the fixed designation D7149; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEUnits of measure were editorially corrected from hard to soft conversions in April 2011.1. Scope1.1 This practice determines
3、the ability of an adhesive towithstand repeated freezing and thawing cycles at specifictemperatures without any significant change in physical prop-erties.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This practice do
4、es not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this practice to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitation prior to use.2. Referenced Documents2.1 ASTM Stan
5、dards:2D907 Terminology of AdhesivesD1084 Test Methods for Viscosity of AdhesivesD1293 Test Methods for pH of WaterD2556 Test Method for Apparent Viscosity of AdhesivesHaving Shear-Rate-Dependent Flow Properties3. Terminology3.1 Definitions:3.1.1 Many of the terms utilized in this practice are defin
6、edin Terminology D907.4. Significance and Use4.1 This practice will provide a procedure for determiningthe stability of an adhesive to withstand five repeated cycles, oras otherwise specified, of freezing and thawing at a specifictemperature.4.2 This practice will allow the user to determine whether
7、 ornot the adhesive can be appropriately applied after cycling offreezing and thawing.4.3 This practice will identify any significant changes in themanufactured viscosity of the product after five cycles, or asotherwise specified, of freezing and thawing at a specifictemperature.4.4 This practice wi
8、ll help determine if the pH of adhesivehas changed significantly due to the freezing and thawingcycles.5. Apparatus5.1 A 1.0 L (1 qt) container, or larger, with lid. Othercontainer sizes may be applicable for some adhesives.5.2 Freezer capable of maintaining -18 6 -2C (0.0 6 -5F)to -7 6 -2C (20 6 -5
9、F).5.3 Brookfield RVT Viscometer 1-spindle TC at520rpms, Heliopath stand.NOTE 1Other viscometer models, their speed and spindle size, maybe utilized as long as they comply to Test Methods D1084 or D2556 andare recommended by the manufacturer for such use.5.4 pH meter.5.5 Tongue depressor or similar.
10、6. Conditioning6.1 Condition the adhesive to be tested 24 h at 23 6 -2C(73 6 -4F) with a relative humidity if 50 6 -5 % prior totesting.7. Procedure7.1 Fill the container with adhesive to be tested.7.2 Check the viscosity of the adhesive after it is transferredinto the container, as defined in Test
11、Methods D1084 (MethodB) or Test Method D2556.7.3 Check the pH of the adhesive after it is transferred intothe container, as defined in Test Method D1293.7.4 Close the container with lid and place it into the freezerat the specified temperature to be tested for a period of not lessthan 16 h.1This pra
12、ctice 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, 2011. Published April 2011. Originallyapproved in 2005. Last previous edition approved in 2005 as D7149 - 05. DOI:10.1520/
13、D7149-05R11E01.2For 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 ASTM website.1Copyright ASTM International, 100 Barr Harbor
14、 Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.5 Remove container from freezer after the appropriatetime limit and allow to thaw until the adhesive reaches roomtemperature as defined in 6.1. It is recommended that aconstant temperature oven with a temperature set at 24 6 -2C(
15、75 6 -4F) be used for the thawing procedure. This constitutesone freeze / thaw cycle. Remove container lid by appropriatemeans; if the adhesive forms a surface film remove with thetongue depressor without stirring contents.7.6 Insert clean tongue depressor about one inch into theadhesive and remove
16、slowly.7.7 If the adhesive “strings” from the tongue depressor orappears gelled, the sample has failed the test. Report whichparticular cycle displayed a change in the physical properties orthat had failed.7.8 If adhesive appears to be of normal consistency, mea-sure viscosity and pH and record.7.9
17、Repeat steps 7.3-7.8 for a total of five cycles or until achange in physical properties or failure is noted.8. Reporting8.1 Report the following information:8.1.1 Type of adhesive.8.1.2 Temperature at which product was frozen and tested.8.1.3 Initial viscosity and pH of adhesive.8.1.4 Viscosity and
18、pH of the individual freeze thaw cyclesor if applicable after which cycle product was no longerclassified as usable.9. Precision and Bias9.1 The precision and bias of this practice for measuringviscosity is essentially as specified in Test Method D1084.Other results produced from this practice are n
19、on-quantitative.10. Keywords10.1 freeze; stability; thawASTM 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
20、 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 technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either
21、 for revision of this standard or 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 hea
22、ring you shouldmake your 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
23、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D7149 05 (2011)12
