ASTM_D_2249_-_01.pdf

Designation:D 2249 01Standard Test Method forPredicting Effect of Weathering on Face Glazing andBedding Compounds on Metal Sash1This standard is issued under the fixed designation D 2249;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 test method covers an accelerated procedure forpredicting the effect of weathering on adhesion,surface crack-ing and peeling,deep bead cracking,oil exudation,andwrinkling of face glazing or bedding compounds,or both,intended for exterior use on steel,aluminum,or other metalsash.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.3 The committee with jurisdiction over this standard is notaware of any equivalent standard published by other ASTMcommittees,ISO or any other standards organizations.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:C 717 Terminology of Building Seals and Sealants2D 1730 Practices for Preparation of Aluminum andAluminum-Alloy Surfaces for Painting3G 151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices That Use Laboratory LightSources4G 153 Practice for Operating Enclosed Carbon Arc LightApparatus for Exposure of Nonmetallic Materials43.Terminology3.1 DefinitionsRefer to Terminology C 717 for definitionsof the following terms:adhesive failure(loss of adhesion);bead;bedding;compound;face glazing;glazing;muntin;rabbet;sight line.4.Summary of Test Method4.1 The test compound is pressed with a knife into a specialaluminum muntin bar/glass assembly which simulates bothface glazing and bedding applications.Each test compound isrun in duplicate.The compound is then exposed in an accel-erated weathering unit for a period up to 300 h.Loss ofadhesion,wrinkling,surface cracking and peeling,deep beadcracking,and oil exudation are observed and recorded.5.Significance and Use5.1 The effect of accelerated weathering will assist injudging the quality and predicting the performance of glazingcompounds.Accelerated weathering devices should not,how-ever,be used to predict the exact number of years of servicelife,or the exact type of failure which will occur under all thevaried conditions encountered in actual use.6.Apparatus and Materials6.1 Accelerated Weathering UnitAs described in Prac-tices G 151 and G 153,equipped with water spray and anun-insulated black panel thermometer.The instrument mustalso be capable of being programmed for a repeating cycle of102 minutes light followed by 18 minutes of light plus waterspray.6.2 Aluminum Muntin Bar/Glass Assembly Parts,two sets,as illustrated in Fig.1.It may be necessary to machine muntinbars to the desired dimensions.6.3 Putty Knife.7.Sampling7.1 Thoroughly mix the entire contents of a full,previouslyunopened container on a clean,nonabsorptive surface,and takefrom this the compound to be tested.8.Conditioning8.1 Condition the full unopened container,the muntin bar,glass,and spacers for at least 5 h at 73.4 6 3.6F(23 6 2C).9.Procedure9.1 Solvent clean the entire assembly thoroughly as de-scribed under Type A of Practices D 1730.9.2 Back BeddingForce a bead of the conditioned com-pound into the narrow rectangular channel formed by the glass1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.12 on Oiland Resin Base Glazing and Caulking Compounds.Current edition approved June 10,2001.Published July 2001.Originallypublished as D 2249 64 T.Last previous edition D 2249 94.2Annual Book of ASTM Standards,Vol 04.07.3Annual Book of ASTM Standards,Vol 02.05.4Annual Book of ASTM Standards,Vol 14.02.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.and the aluminum as shown in Fig.1,taking care to ensure thatthe compound completely fills the space with no voids.Remove excess compound and smooth the exposed surfacewith a few light strokes of the putty knife.9.3 Face GlazingWith the glass in place,apply a portionof the thoroughly mixed compound to the wide,triangularsection of each of the two test sash assemblies with a puttyknife,using a maximum of two cut-off strokes and foursmoothing strokes.Be sure to force the compound tightlyagainst the rabbet to ensure good initial adhesion.9.4 Hang the assemblies in a vertical position