1、Designation: C 488 05Standard Test Method forConducting Exterior Exposure Tests of Finishes for ThermalInsulation1This standard is issued under the fixed designation C 488; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f 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.1. Scope1.1 This test method covers out-of-doors exposure testing offinishes that are normally field-applied to thermal insulat
3、ionwhich 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 span a dry joint.
4、 This testmethod is not intended to evaluate mildew resistance, efflores-cence, or chemical resistance.NOTE 1For testing free plastic films, see Practice D 1435.1.2 This test method does not prescribe the method ofapplication, test duration, or inspection intervals.1.3 The values stated in inch-poun
5、d units are to be regardedas the standard. The values given in parentheses are providedfor information only.1.4 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
6、and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 168 Terminology Relating to Thermal InsulationD 1435 Practice for Outdoor Weathering of Plastics3. Terminlogy3.1 Definitions: Terminology C 168 applies to the ter
7、msused in 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 specimens and onecontrol specimen stored indoors.5. Significance and Use5.1 Both phy
8、sical 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 be made bothbefore and after specific periods of outdoor exposure.5.2 This test met
9、hod recognizes that differing geographicallocations, environmental conditions, differences between sur-face temperatures and ambient temperatures, and test durationsmay have extremely varied effects upon the test results.5.3 This test method is to be used for comparative qualita-tive testing.6. Test
10、 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 be the same as that which isproposed for the application. The control specimen shall
11、 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 prepared:6.2.1 Thermal insulation with no joints,6.2.2 Thermal insulation with dry joints,
12、 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 may be cut in the insulation block.Joints shall be at least 4 in. (100 mm) apart and a
13、t 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 with a suitable adhesive to a larger slab of thesame insulation of dimensions of the d
14、esired completed speci-men size in order to form a stable base for the specimen.6.3.1 For test specimens resulting in less than 1 in. (25 mm)thickness, the joint shall be practiced on the fully cut specimen.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is
15、the direct responsibility of Subcommittee C16.33 on InsulationFinishes and Moisture.Current edition approved April 1, 2005. Published April 2005. Originallyapproved in 1962. Last previous edition approved in 2004 as C 488 93(2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org,
16、 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 Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.4 The joints
17、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 exposed to the atmospherebefore the finish coat is applied.6.5 The finish to be evaluated shall be ap
18、plied 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 finish shall be made a part of thetest record.6.7 The specimen shall be prepared, flashed or sealed, andm
19、ounted 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-doorstest specimens shall be 45 from the horizontal, facing upwardand due south. The 6-in. (150-mm) dim
20、ension 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 shadows on each other, and in such a mannerthat any products of weathering and rain water drippings sh
21、allnot 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 sufficient toevaluate the characteristics of the finishes under evaluation.7.5 Make inspections at regular i
22、ntervals, 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 between sealant and finish.8. Report8.1 Report the following information:8.1.1 Type of insulation,8.1.2 Siz
23、e 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 Application procedure for single and multiple coats,8.1.8 Use of any reinforcing membrane,8.1.9 Thickn
24、ess 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 observations: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
25、.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 method since the result merely reports the visualpresence of discoloration, cracking, crazing, flaking
26、, 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 International takes no position respecting the validity of any patent rights asserted in connection
27、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 entirely their own responsibility.This standard is subject to revision at any time by the responsible te
28、chnical 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 standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consider
29、ation 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 on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr
30、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).C488052
