ASTM_D_1848_-_88_1998.pdf

Designation:D 1848 88(Reapproved 1998)Standard Classification forReporting Paint Film Failures Characteristic of ExteriorLatex Paints1This standard is issued under the fixed designation D 1848;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of 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 classification covers descriptions of properties thatmay be observed in weathered latex paint films.These descrip-tions should be used in reporting the condition of such paintfilms.NOTE1In inspecting weathered exterior latex paints,defects orfailures in the films may be observed that are not described in ASTMmethods for evaluating the deterioration of exterior paints of the linseed-oil type.2.Types of Defects2.1 The following types of defects of exposed latex paintfilms are recognized:2.1.1 Efflorescence,characterized by a commonly white,nonuniform powdery incrustation not readily removed bywiping.Usually it cannot be removed with water only but canbe removed with dilute mineral acid.2.1.2 Mottling(or Blotching)The presence of irregularlyshaped and randomly distributed areas of nonuniform appear-ance in color,gloss,or sheen.2.1.3 Water SpottingNonuniformities in color,gloss,orsheen in the shape of spots or streaks,caused by drops orrivulets of water.2.1.4 CrawlingDefect in which the wet film recedes fromsmall areas of the substrate(usually caused by insufficientwetting)leaving those areas uncoated.2.1.5 PinholingThe presence of a series of fine holes orvoids in the film.2.1.6 Mud-Cracking,characterized by an irregular brokennetwork of cracks in the film.3.Keywords3.1 exterior paints/coatings;latex paintsThe American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of 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by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards,100 Barr Harbor Drive,West Conshohocken,PA 19428.1This classification is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,andApplications,and is the direct responsibility ofSubcommittee D01.42 on Architectural Finishes.Current edition approved Oct.31,1988.Published December 1988.Originallypublished as D 1848 61 T.Last previous edition D 1848 63(1984)e1.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTM