1、Designation:D 2451 99Standard Test Method forDegree of Set for Glazing Compounds on Metal Sash1This standard is issued under the fixed designation D 2451;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 describes a laboratory method fordetermining the degree of set of face glazing or beddingcompounds,or both,when used on any
3、metal sash.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 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 establ
4、ish 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 217 Test Methods for Cone Penetration of LubricatingGrease33.Terminology3.1 DefinitionsDefi
5、nitions of the following terms arefound in Terminology C 717:bedding,compound,face glaz-ing,glazing.4.Significance and Use4.1 This test method provides an accelerated means forpredicting the effect of time and weathering on the setting ofglazing compounds.5.Apparatus5.1 Brass Ring,63.5 mm(212in.)in
6、diameter by 12.7 mm(12in.)deep and approximately 1.6 mm(116in.)in wallthickness(Fig.1).5.2 Glass Plate,double strength,approximately 102 by 102mm(4 by 4 in.)(Fig.1).5.3 Aluminum Foil,household,approximately 102 by 102mm(4 by 4 in.)(Fig.1).5.4 Putty Knife.5.5 Gravity-Convection Oven,controlled at 65
7、6 2C(1496 3.6F).5.6 Penetrometer,fitted with the tip and shaft of a greasepenetration cone as described in Fig.4 of Test Methods D 217,with a total moving load of 54.5 6 0.1 g.5.7 Photo Spot Light,or equivalent.6.Reagent6.1 Solvent,such as methyl ethyl ketone or acetone.7.Sampling7.1 The compound to
8、 be tested shall be taken from apreviously unopened container.Remove the compound fromthe container and work with a putty knife to a homogenousconsistency on a nonporous surface.8.Procedure8.1 Cover the glass plate with the sheet of foil;then centerthe brass ring on the covered plate and pack the mi
9、xedcompound flush with the top of the ring(Fig.1).8.2 Place the specimen(glass plate,ring compound)in theoven controlled at 65 6 2C(149 6 3.6F).The specimen shallbe at the same level in the oven as the temperature-measuringdevice.Allow the specimen to remain in the oven for 336 h(2weeks).8.3 Remove
10、the test specimen and allow it to stand at roomtemperature for 1 h.Then condition for another hour at 25 612C(77 6 1F).If necessary,the specimen may be placed in1This test method is under the jurisdiction of ASTM Committee C-24 onBuilding Seals and Sealants and is the direct responsibility of Subcom
11、mittee C24.12on Oil and Resin Base Glazing and Caulking Sealants.Current edition approved Feb.10,1999.Published April 1999.Originallypublished as D 2451 66 T.Last previous edition D 2451 94.2Annual Book of ASTM Standards,Vol 04.07.3Annual Book of ASTM Standards,Vol 05.01.FIG.1 Apparatus Required for
12、 Set Test1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMNOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for t
13、he latest information.a can or similar tightly sealed container and submerged in awater bath at the designated temperature.8.4 Remove the aluminum foil carefully from the bottom ofthe ring by slowly peeling the back away from the compound.8.5 Invert the ring and place it on the stand of the penetrom
14、-eter(Fig.2).Adjust the dial to zero or other recorded reading.Release the moving load for 5 s,after which read thepenetration.Take four readings on the freshly exposed surface19 mm(34in.)away from the edge of the ring equally distantaround the periphery at 12-3-6-9 oclock positions(Fig.3).Clean the
15、 tip of the cone after each reading.NOTE1The degree of set is measured by the ability of the compoundto resist penetration of the weighted cone.Before use,both the shaft of thepenetrometer and the bushing through which it falls shall be thoroughlycleaned with solvent.The original contact point of th
16、e tip is very importantin obtaining accurate readings.By providing strong light from a photospot light or similar source from behind the penetrometer a shadow is castand the point of the tip brought down until the tip and its shadow justcoincide on the surface of the compound.9.Report9.1 Report the penetration as the average of the fourdeterminations.10.Precision and Bias10.1 On the basis of a round-robin in which seven labora-tories tested four samples,the“between-laboratories”standarddeviation