1、Designation: C488 05 (Reapproved 2010)Standard Test Method forConducting Exterior Exposure Tests of Finishes for ThermalInsulation1This standard is issued under the fixed designation C488; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, 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.1. Scope1.1 This test method covers out-of-doors exposure testing offinishes that are normally field-applied to
3、thermal insulationwhich may include joints or joint sealants, or both. Suchexposure may be essential prior to the determination of certainphysical properties. This test method may also indicate com-patibility problems between the joint sealant and the finish aswell as the ability of the finish to sp
4、an a dry joint. This testmethod is not intended to evaluate mildew resistance, efflores-cence, or chemical resistance.NOTE 1For testing free plastic films, see Practice D1435.1.2 This test method does not prescribe the method ofapplication, test duration, or inspection intervals.1.3 The values state
5、d in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use.
6、 It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationD1435 Practice for Outdoor Wea
7、thering of Plastics3. Terminlogy3.1 Definitions: Terminology C168 applies to the terms usedin this test method.4. Summary of Test Method4.1 This test method specifies out-of-doors exposure, underambient conditions, of field-applied finishes on thermal insu-lations, utilizing a minimum of three test
8、specimens and onecontrol specimen stored indoors.5. Significance and Use5.1 Both physical and chemical changes may occur fromweather exposure, and these changes affect performance prop-erties, service life, and maintenance schedules. For this reason,tests of properties relating to performance should
9、 be made bothbefore and after specific periods of outdoor exposure.5.2 This test method recognizes that differing geographicallocations, environmental conditions, differences between sur-face temperatures and ambient temperatures, and test durationsmay have extremely varied effects upon the test res
10、ults.5.3 This test method is to be used for comparative qualita-tive testing.6. Test Specimens6.1 A minimum of three test specimens and one controlspecimen, each having been applied to an insulation base ofminimum dimensions 1 by 6 by 12 in. (25 by 150 by 300 mm),shall be prepared. Insulation shall
11、be the same as that which isproposed for the application. The control specimen shall bestored indoors.6.1.1 If the insulation thickness in actual application is lessthan 1 in. (25 mm), then the thickness of the insulation baseshall be as in practice.6.2 The following types of specimens may be prepar
12、ed:6.2.1 Thermal insulation with no joints,6.2.2 Thermal insulation with dry joints, and6.2.3 Thermal insulation with joints filled with joint sealant.6.3 For testing compatibility of sealants with finishes, jointsat least 1 in. (25 mm) deep by116 to316 in. (2 to 5 mm) wideby 12 in. (300 mm) long ma
13、y be cut in the insulation block.Joints shall be at least 4 in. (100 mm) apart and at least 4 in.(100 mm) from the edges, parallel to the joint. More than onesealant may be tested with a single finish by varying the sealantin each successive joint. These individual insulation piecesmay be adhered wi
14、th a suitable adhesive to a larger slab of the1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.33 on InsulationFinishes and Moisture.Current edition approved Nov. 1, 2010. Published January 2011. Originallyappr
15、oved in 1962. Last previous edition approved in 2005 as C488 5. DOI:10.1520/C0488-05R102For 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 Summar
16、y page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.same insulation of dimensions of the desired completed speci-men size in order to form a stable base for the specimen.6.3.1 For test specimens resulting in les
17、s than 1 in. (25 mm)thickness, the joint shall be practiced on the fully cut specimen.6.4 The joints filled with the joint sealant may have thefinish applied immediately or allowed to cure or set for a week.The compatibility results may vary significantly dependingupon how long the joint sealant is
18、exposed to the atmospherebefore the finish coat is applied.6.5 The finish to be evaluated shall be applied to thespecified test face and edges of the insulation base material.The application procedure for single and multiple coats shall bemade a part of the test records.6.6 The thickness of the fini
19、sh shall be made a part of thetest record.6.7 The specimen shall be prepared, flashed or sealed, andmounted so that liquid water cannot enter the specimen.6.8 The use of any reinforcing membrane shall be made apart of the test record.7. Procedure7.1 The exposure or mounting position of the out-of-do
20、orstest specimens shall be 45 from the horizontal, facing upwardand due south. The 6-in. (150-mm) dimension shall be hori-zontal, east to west.7.2 Record the geographical latitude, longitude, and altitudeof the test location.7.3 Mount the test specimens so that they are neither in ashadow nor cast s
21、hadows on each other, and in such a mannerthat any products of weathering and rain water drippings shallnot flow from one test specimen to another. Fasten specimensby the back surface in such a manner as to prevent displace-ment by the wind.7.4 The test period shall be either as specified or suffici
22、ent toevaluate the characteristics of the finishes under evaluation.7.5 Make inspections at regular intervals, observing:7.5.1 Discoloration,7.5.2 Cracking,7.5.3 Crazing,7.5.4 Flaking,7.5.5 Chalking,7.5.6 Shrinkage,7.5.7 Blistering,7.5.8 Holes,7.5.9 Loss of adhesion, and7.5.10 Incompatibility betwee
23、n sealant and finish.8. Report8.1 Report the following information:8.1.1 Type of insulation,8.1.2 Size of sample,8.1.3 Presence of joints,8.1.4 Type and identification of joint sealants,8.1.5 Length of cure time of joint sealants prior to applica-tion of finish,8.1.6 Type of finish and color,8.1.7 A
24、pplication procedure for single and multiple coats,8.1.8 Use of any reinforcing membrane,8.1.9 Thickness of finish,8.1.10 Geographical location (latitude, longitude, and alti-tude),8.1.11 Test duration and dates of exposure and removal, and8.1.12 Inspection intervals.8.2 Report the following observa
25、tions:8.2.1 Discoloration,8.2.2 Cracking,8.2.3 Crazing,8.2.4 Flaking,8.2.5 Chalking,8.2.6 Shrinkage,8.2.7 Blistering,8.2.8 Holes,8.2.9 Loss of adhesion, and8.2.10 Incompatibility between sealant and finish.9. Precision and Bias9.1 No statement is made about either the precision or biasof this test m
26、ethod since the result merely reports the visualpresence of discoloration, cracking, crazing, flaking, chalking,shrinkage, blistering, holes, loss of adhesion, and incompat-ibility between sealant and finish.10. Keywords10.1 coatings; exterior exposure test; test procedure; vaporbarrier finishesASTM
27、 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 such rights, are ent
28、irely 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 additional standardsan
29、d 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 ASTM Committee o
30、n 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C488 05 (2010)2
