1、Designation: C 661 06Standard Test Method forIndentation Hardness of Elastomeric-Type Sealants byMeans of a Durometer1This standard is issued under the fixed designation C 661; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method describes a l
3、aboratory procedure fordetermining indentation hardness of joint sealing compounds,(single- and multicomponent), intended for use in buildingconstruction.1.2 The values stated in SI units are to be regarded as thestandard. The values in parentheses are for information only.1.3 The committee with jur
4、isdiction over this standard is notaware of any comparable standards published by other orga-nizations.1.4 This standard does not purport to address the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth pra
5、ctices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 717 Terminology of Building Seals and SealantsD 2240 Test Method for Rubber PropertyDurometerHardness3. Terminology3.1 DefinitionsSee Terminology C 717 for applicabledefinitions
6、of the following terms: compound; elastomeric;hardness; joint; sealant, non-sag; sealant, self-levling.4. Significance and Use4.1 The results obtained by this test method are simply ameasure of the indentation into the sealant material of theindentor under load; they are not generally considered ame
7、asure of abrasion or wear resistance of the sealant.5. Apparatus5.1 Durometer, Type A-2, with a dial graduated in units from0 to 100. (See Test Method D 2240 for a description of theindentor and a method of calibration of the durometer.)5.2 Rectangular Brass Frame, with inside dimensions 130by 40 by
8、 6 mm (approximately 5 by 112 by14 in.).5.3 Aluminum Plates, two 16 to 24 gage, 80 by 150 mm(approximately 3 by 6 in.).5.4 Thin-Bladed Knife.5.5 Chamber, capable of maintaining 38 6 2C (100 63.5F) and 95 % relative humidity.5.6 Metal Straightedge.6. Standard Test Conditions6.1 Unless otherwise speci
9、fied by those authorizing thetests, standard conditions for test are room temperature: 23 62C (73.4 6 3.6F) and 50 6 5 % relative humidity.7. Procedure7.1 Test for Hardness of Multicomponent Sealants:7.1.1 Condition at least 250 g of base compound andappropriate amounts of curing agent for at least
10、24 h atstandard conditions; then mix the components thoroughly for 5min.7.1.2 Fill the brass frame, after centering it on the aluminumplate, with a portion of the conditioned compound and strike itoff flat with a metal straightedge. Lift the frame from thesealant after separating it by running a thi
11、n-bladed knife alongthe inside of the frame. Prepare two such specimens and curethem for 14 days at standard conditions.NOTE 1In the case of a self-leveling sealant or compound, do not liftthe brass frame until the sealant is sufficiently cured so that it will notspread on the plate.7.1.3 At the end
12、 of the curing period, take three hardnessreadings on each specimen at standard conditions. Hold thedurometer on the surface of the specimen and press it firmly1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommit
13、tee C24.20 onGeneral Test Methods.Current edition approved Jan. 1, 2006. Published February 2006. Originallyapproved in 1970. Last previous edition approved in 1998 as C 661 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. F
14、or 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.against the surface using a force of about 1.3 kgf (3 lbf). Keepthe p
15、ressure foot parallel to the surface of the specimen. Takethe instantaneous indentation reading immediately after mak-ing firm contact between the pressure foot and the specimen.After taking the first reading, shift the durometer (or specimen)to a new position in order to avoid errors due to fatigue
16、 andsurface effects from the previous indentation. Take readings onsmooth portions of the surface no closer than 13 mm (12 in.)from the edges of the sealant pat and also no closer than 25 mm(1 in.) from each other. Note the individual values, eachrounded off to the nearest unit on the scale.NOTE 2Th
17、e highest precision in this test can be obtained when thedurometer is supported by a rigid stand and a dead weight is fasteneddirectly to the instrument with the center of gravity of the weight actingin line of the indentor point. A freely acting total deadweight load ofapproximately 1.3 kgf (3 lbf)
18、 has been found satisfactory for the testing ofvarious sealants (Fig. 1).NOTE 3The values obtained in the test method described in 7.1.3 areknown as “instantaneous” values. Occasionally a purchaser may request“delayed” values such as these taken aftera5or10-s delay. To obtain adelayed value the same
19、 procedure is followed, except that the pressurefoot is allowed to rest on the surface of the sealant under the fixed load forthe additional time requested and a reading is taken at the specified time,for example, after 5 s, 10 s, or other specified period. Delayed readings aretaken in addition to t
20、he instantaneous reading. An instrument with amaximum reading hand is helpful in making such determinations.7.2 Test for Hardness of Single-Component Sealants:7.2.1 Condition at least 250 g of compound for a minimumof 24 h at standard conditions before starting the test.7.2.2 Center the brass frame
21、on the aluminum plate and fillthe opening with a portion of the conditioned compound,striking the compound off flat with a straightedge. Lift theframe from the sealant after separating it by running athin-bladed knife along the inside edge of the frame. Two suchspecimens shall be prepared.7.2.3 Cure
22、 the test specimens for a total of 21 days asfollows: 7 days at standard conditions; 7 days in a chambercontrolled at 38 6 2C (100 6 3.5F) and 95 % relativehumidity; and 7 days at standard conditions.NOTE 4The manufacturer may request combinations of temperatureand relative humidity for curing purpo
23、ses other than those specified,provided that (1) the curing period is not longer than 21 days and (2) thetemperature does not exceed 50C (122F).7.2.4 At the end of the 21-day curing period, proceed asdescribed in 7.1.3. (See Notes 2 and 3.)8. Report8.1 Report the following information for each speci
24、mentested:8.1.1 Tradename or other identification of the sealant.8.1.2 Description of the type of compound, such as whethernon-sag, self-leveling sealant, single- or multi-component,color, etc.8.1.3 Description of the curing conditions used in test.8.1.4 Name and description of the durometer.8.1.5 T
25、he six individual hardness values and the meanvalue.8.1.5.1 To determine the mean value, individual readingswith a variation of 15 % from the average value of the sixreadings shall be discarded. If more than two readings are thusdiscarded, a completely new set of six readings shall be taken.8.1.6 Th
26、e delayed reading values, if they are specified bythe purchaser.9. Precision and Bias39.1 The precision and bias calculations for this test methodare based on the results of four laboratories testing five sealantsperforming the test five times for each sealant. The results aregiven in Table 1.9.2 In
27、 another series, ten laboratories tested three well-curedsealants. All were cured by one laboratory and distributed andtested on the same day by all ten laboratories. Two testingdevices were used on all three sealants (one hand held, onefixed to a stand); all were calibrated. The results are given i
28、nTable 2.NOTE 5The key to the reproducibility between laboratories improv-ing in 9.2 over 9.1 is the elimination of the variability of the cure cyclefrom laboratory to laboratory. The data in 9.2 indicates the test can berelatively precise if the cure cycle is identically repeated in eachlaboratory.
29、 The usual case between laboratories may more closely berepresented by the statistics in 9.1.3Supporting data are available from ASTM Headquarters. Request RR:C241012 and C241015.FIG. 1 Type of Durometer Used to Measure Indentation Hardnessof Joint SealantsC6610629.3 The data using four test machine
30、s (two hand held, twoon a stand), all on the same cure sealant in each at tenlaboratories, is given in Table 3.10. Keywords10.1 elastomeric sealant; hardnessASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standar
31、d. 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 technical committee and must be reviewed
32、 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 consideration at a meeting of theresponsible t
33、echnical 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 Harbor Drive, PO Box C700, West Consho
34、hocken, 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).TABLE 1 Precision and Bi
35、as Data from Four Laboratories for Five SealantsAMaterial AverageEstimated StandardDeviation Within aLaboratoryEstimated StandardDeviation BetweenLaboratoriesRepeatability(Internal)Reproducibility(Internal)G1 12.8 1.4 2.4 4.4 18.1G2 36.2 3.5 4.0 6.2 16.0G3 43.8 1.6 6.4 4.0 6.8G4 25.7 3.6 7.8 10.1 22
36、.0G5 38.2 2.2 5.6 9.9 11.2AAt 95 % confidence, the durometer as measured by this test method can vary 10 points within a laboratory and 22 points between laboratories.TABLE 2 Precision and Bias Data from Ten Laboratories forThree Cured SealantsAMaterial AverageEstimated StandardDeviation Within aLab
37、oratoryEstimated StandardDeviation BetweenLaboratoriesG2 40 2.3 2.6G1 41 2.3 2.8G3 71 1.4 2.0AAt 95 % confidence a durometer can vary6 6 points within a laboratory and 68points between laboratories.TABLE 3 Precision and Bias Data from Ten Laboratories withOne Cured Sealant and Two Testing InstrumentsAMaterial AverageEstimated StandardDeviation BetweenLaboratoriesG4 67 1.1G2 70 2.1G3 71 0.6G1 71 1.6AAt 95 % confidence, a durometer can vary6 6 points between laboratorieswhen different test machines are used.C661063
