1、Designation: D 7149 05Standard Practice forDetermining the Freeze Thaw Stability of Adhesives1This standard is issued under the fixed designation D 7149; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice determines the ability of an adhesive towithstand repeated freezing and thawing cycles at specifictemperatures without a
3、ny 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 does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
4、 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 Standards:2D 907 Terminology of AdhesivesD 1084 Test Methods for Viscosity of AdhesivesD 1293 Test Method for pH
5、of WaterD 2556 Test Method for Apparent Viscosity of AdhesivesHaving Shear-Rated-Dependent Flow3. Terminology3.1 Definitions:3.1.1 Many of the terms utilized in this practice are definedin Terminology D 907.4. Significance and Use4.1 This practice will provide a procedure for determiningthe stabilit
6、y 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 ornot the adhesive can be appropriately applied after cycling offreezing and thawing.4.3 This practice will identi
7、fy 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 will help determine if the pH of adhesivehas changed significantly due to the freezing and thawingcycles.5. Apparatus
8、5.1 A .9081 L (1 qt) container, or larger, with lid. Othercontainer sizes may be applicable for some adhesives.5.2 Freezer capable of maintaining -17.7C 6-2 (0.0 F6-5) to -6.6C 6-2 (20 F 6-5).5.3 Brookfield RVT Viscometer 1-spindle TC at520rpmsHeliopath stand.NOTE 1Other viscometer models, their spe
9、ed and spindle size, maybe utilized as long as they comply to Test Methods D 1084 or D 2556 andare recommended by the manufacturer for such use.5.4 pH meter.5.5 Tongue depressor or similar.6. Conditioning6.1 Condition the adhesive to be tested 24 h at 23 C 6-2(73.4 6-4 F) with a relative humidity if
10、 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 Methods D 1084 (MethodB) or Test Method D 2556.7.3 Check the pH of the adhesive after it is transferred intot
11、he container, as defined in Test Method D 1293.7.4 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.7.5 Remove container from freezer after the appropriatetime limit and allow to thaw until the adhesive reaches room
12、temperature as defined in 6.1. It is recommended that aconstant temperature oven with a temperature set at 23.9 C6-2 (75 F 6-4) be used for the thawing procedure. Thisconstitutes one freeze/ thaw cycle. Remove container lid by1This practice is under the jurisdiction of ASTM Committee D14 on Adhesive
13、sand is the direct responsibility of Subcommittee D14.10 on Working Properties.Current edition approved April 1, 2005. Published June 2005.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume
14、 information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.appropriate means; if the adhesive forms a surface film removewith the tongue depressor without stirring co
15、ntents.7.6 Insert clean tongue depressor about one inch into theadhesive and remove 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 adh
16、esive appears to be of normal consistency, mea-sure viscosity and pH and record.7.9 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 w
17、as frozen and tested.8.1.3 Initial viscosity and pH of adhesive.8.1.4 Viscosity and 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 essential
18、ly as specified in Test Method D 1084.Other results produced from this practice are non-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
19、 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 technical committee and must be reviewed every five year
20、s 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 consideration at a meeting of theresponsible technical committ
21、ee, 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 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).D7149052
