ASTM_C_920-11.pdf

C920-114.1.7 Class 35-A sealant that when tested for adhesion and6.General Requirementscohesion under cyclic movement(8.8)shall withstand an6.1 Stability:increase and decrease of at least 35 of the joint width as6.1.1 A single-component sealant,when stored in the origi-measured at the time of application,and,in addition,meet allnal unopened container at temperatures of not more than 27Cthe requirements of this specification.(80F)shall be capable of meeting the requirements of this4.1.8 Class 25-A sealant that when tested for adhesion andspecification for at least 6 months after date of delivery.cohesion under cyclic movement(8.8)shall withstand an6.1.2 A multicomponent sealant.when stored in the originalincrease and decrease of at least 25 of the joint width asunopened container at temperatures of not more than 27Cmeasured at the time of application,and,in addition,meet all(80F)shall be capable of meeting the requirements of thisthe requirements of this specification.specification for at least 6 months after date of delivery.4.1.9 Class 1212-A sealant that when tested for adhesion6.2 Color-The color of the sealant,after curing 14 days inand cohesion under cyclic movement(8.8)shall withstand ana laboratory controlled at232C(73.43.6F)and50increase and decrease of at least 12%of the joint width as5%relative humidity.shall be that color which has beenmeasured at the time of application,and,in addition,meet allagreed upon between the purchaser and the supplier.the requirements of this specification.6.3 The sealant shall be intended for use only on clean,dry4.1.10 Use T-A sealant designed for use in joints insurfaces.Where a primer is recommended by a manufacturerpedestrian and vehicular traffic areas such as walkways,plazas,for a specific surface,all tests on that surface shall include thedecks and parking garages where a higher modulus,firmerprimer.sealant is desired.4.1.11 Use T2-A sealant designed for use in joints inNorE 2-The proper use of primers(or surface conditioners)inpedestrian and vehicular traffic areas such as walkways,plazas,connection with the application of sealants is described in detail in Guidedecks and parking garages where a more lower modulus,softerC1193.This guide also describes proper methods for joint design,back-upmaterials,surface preparation,tooling of sealant,and other importantsealant is desired.procedures in sealant application in buildings.Nor 1-Hardness alone does not correlate with joint performance.6.4 The same conditions of time,temperature,and humidityThe joints in pedestrian and vehicular traffic areas such as walkways,shall be used for cure of test specimens for Test Methods C661,plazas,decks,and parking garages require appropriate design consider-C719.C794.andC1247.ations including material selection,total joint design,manufacturerinvolvement and field testing.7.Significance and Use4.1.12 Use NT-A sealant designed for use in joints in7.1 This specification covers several classifications of seal-nontraffic areas.ants as described in Section 4 for various applications.It4.1.13 Use/-A sealant designed for use in joints which areshould be recognized by the purchaser or design professionalsubmerged continuously in a liquid.that not all sealants meeting this specification are suitable for4.1.14 Use M-A sealant that meets the requirements of thisall applications and all substrates.It is essential,therefore,thatspecification when tested on mortar specimens in accordancethe applicable type,grade,class,and use be specified so thatwith 9.9 and 9.10.the proper classification of sealant is provided for the intended4.1.15 Use G-A sealant that meets the requirements of thisuse.Test methods relate to special standard specimen sub-specification when tested on glass specimens in accordancestrates of mortar,glass,and aluminum.If tests are requiredwith9.9-9.11.using substrates in addition to or other than the standard,they4.1.16 Use A-A sealant that meets this specification whenshould be so specified for testing.tested on aluminum specimens in accordance with 9.9 and9.10.8.Physical Requirements4.1.17 Use O-A sealant that meets this specification when8.1 Rheological Properties:tested on substrates other than the standard substrates in8.1.1 Grade P(pourable or selfleveling)sealant shall haveaccordance with 9.9 and 9.10.flow characteristics such that when tested in accordance withTest Method C639 it shall exhibit a smooth.level surface.5.Materials and Manufacture(Refer to Types I and III in the test.)5.1 A single-component sealant shall be a uniform mixture8.1.2 Grade NS(nonsag)or gunnable sealant shall haveof a consistency suitable for immediate application by hand orflow characteristics such that when tested in accordance withpressure caulking gun or by hand tool.The sealant whenTest Method C639 it does not sag more than 4.8 mm(16 in.)completely cured shall form an elastomeric solid capable ofin vertical displacement.Also the sealant shall show nomaintaining a seal.deformation in horizontal displacement.(Refer to Types II and5.2 A multicomponent chemically curing sealant shall beIV in the test.)furnished in two or more components.The resulting mixture8.2 Extrusion Rate:shall be uniform and of a consistency suitable for immediate8.2.1 Type S(single component),Grade P(pourable orapplication by hand or pressure caulking gun,or by hand tool.selfleveling)sealant shall have an extrusion rate of not less thanThe sealant when completely cured shall form an elastomeric10mL/min when tested in accordance with Test Method C1183solid capable of maintaining a sealProcedure A.Copyright by ASTM Intl(all rights reserved):Thu Sep2000:41:52 EDT 2012 2C920-119.6 Effects of Heat Aging-Test Method C124610.Packaging and Marking9.7 Tack-Free Time-Test Method C679.9.8 Stain and Color Change-Test Method C510.10.1 Packaged materials that are certified by the manufac-9.9 Adhesion and Cohesion After Cyclic Movement-Testturer to be in compliance with this specification shall be labeledMethod C719.as to type,class,grade,and use,in accordance with Section 7.9.10 Adhesion-in-Peel-Test Method C794.10.2 All certification to this specification shall state time,9.11 Adhesion-in-Peel After Ultraviolet Exposure Throughtemperature,and humidity of cure used in the tests.Glass-Test Method C794.9.12 Effects of Accelerated Weathering-Test Method11.KeywordsC793.11.1 continuous immersion:elastomeric sealants:joint seal-9.13 Sealants Exposed to Continuous Immersion-TestMethod C1247.ants;sealants;specificationASTM Intemational takes no position respecting the validity of any patent rights asserted in connection 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 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 International Headquarters.Your comments will receive careful consideration 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 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).Permission rights to photocopy the standard may also be secured from the ASTM website(www.astm.org/COPYRIGHT/).Copyright by ASTM Intl(all rights reserved):Thu Sep2000:41:52 EDT 2012 4