1、Designation: C 920 08Standard Specification forElastomeric Joint Sealants1This standard is issued under the fixed designation C 920; 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
2、 indicates the year of last reapproval. Asuperscript epsilon () 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 specification covers the properties of a curedsingle- or multicomponen
3、t cold-applied elastomeric joint seal-ant for sealing, caulking, or glazing operations on buildings,plazas, and decks for vehicular or pedestrian use, and types ofconstruction other than highway and airfield pavements andbridges.1.2 A sealant meeting the requirements of this specificationshall be de
4、signated by the manufacturer to be one or more ofthe types, classes, grades, and uses defined in Section 7.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard is similar, but not identical, to ISO 11600.2. Ref
5、erenced Documents2.1 ASTM Standards:2C 510 Test Method for Staining and Color Change ofSingle- or Multicomponent Joint SealantsC 639 Test Method for Rheological (Flow) Properties ofElastomeric SealantsC 661 Test Method for Indentation Hardness ofElastomeric-Type Sealants by Means of a DurometerC 679
6、 Test Method for Tack-Free Time of ElastomericSealantsC 717 Terminology of Building Seals and SealantsC 719 Test Method for Adhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C 793 Test Method for Effects of Laboratory AcceleratedWeathering on Elastomeric Joint
7、SealantsC 794 Test Method for Adhesion-in-Peel of ElastomericJoint SealantsC 1183 Test Method for Extrusion Rate of ElastomericSealantsC 1193 Guide for Use of Joint SealantsC 1246 Test Method for Effects of Heat Aging on WeightLoss, Cracking, and Chalking of Elastomeric SealantsAfter CureC 1247 Test
8、 Method for Durability of Sealants Exposed toContinuous Immersion in Liquids3. Terminology3.1 DefinitionsRefer to Terminology C 717 for definitionsof the following terms used in this specification: adhesivefailure, caulking, chemically curing sealant, cohesive failure,cure, cured, elastomeric, glazi
9、ng, joint, primer, seal, sealant.4. Classification of Sealants4.1 A sealant qualifying under this specification shall beclassified as to type, grade, class, and use as follows:4.1.1 Type SA single-component sealant.4.1.2 Type MA multicomponent sealant.4.1.3 Grade PA pourable or selfleveling sealant
10、that hassufficient flow to form a smooth, level surface when applied ina horizontal joint at 4.4C (40F).4.1.4 Grade NSA nonsag or gunnable sealant that permitsapplication in joints on vertical surfaces without sagging orslumping when applied at temperatures between 4.4 and 50C(40 and 122F).4.1.5 Cla
11、ss 100/50Asealant that when tested for adhesionand cohesion under cyclic movement (8.8) shall withstand anincrease of at least 100 % and a decrease of at least 50 % of thejoint width as measured at the time of application, and, inaddition, meet all the requirements of this specification.4.1.6 Class
12、50Asealant that when tested for adhesion andcohesion under cyclic movement (8.8) shall withstand anincrease and decrease of at least 50 % of the joint width asmeasured at the time of application, and, in addition, meet allthe requirements of this specification.4.1.7 Class 35Asealant that when tested
13、 for adhesion andcohesion under cyclic movement (8.8) shall withstand anincrease and decrease of at least 35 % of the joint width asmeasured at the time of application, and, in addition, meet allthe requirements of this specification.1This specification is under the jurisdiction of ASTM Committee C2
14、4 onBuilding Seals and Sealants and is the direct responsibility of Subcommittee C24.10on Specifications, Guides and Practices.Current edition approved July 15, 2008. Published August 2008. Originallyapproved in 1979. Last previous edition approved in 2005 as C 920 05.2For referenced ASTM standards,
15、 visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For 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 194
16、28-2959, United States.4.1.8 Class 25Asealant that when tested for adhesion andcohesion under cyclic movement (8.8) shall withstand anincrease and decrease of at least 25 % of the joint width asmeasured at the time of application, and, in addition, meet allthe requirements of this specification.4.1.
17、9 Class 1212 A sealant that when tested for adhesionand cohesion under cyclic movement (8.8) shall withstand anincrease and decrease of at least 1212 % of the joint width asmeasured at the time of application, and, in addition, meet allthe requirements of this specification.4.1.10 Use T1A sealant de
18、signed for use in joints inpedestrian and vehicular traffic areas such as walkways, plazas,decks and parking garages where a higher modulus, firmersealant is desired.4.1.11 Use T2A sealant designed for use in joints inpedestrian and vehicular traffic areas such as walkways, plazas,decks and parking
19、garages where a more lower modulus, softersealant is desired.NOTE 1Hardness alone does not correlate with joint performance.The joints in pedestrian and vehicular traffic areas such as walkways,plazas, decks, and parking garages require appropriate design consider-ations including material selection
20、, total joint design, manufacturerinvolvement and field testing.4.1.12 Use NTA sealant designed for use in joints innontraffic areas.4.1.13 Use IA sealant designed for use in joints which aresubmerged continuously in a liquid.4.1.14 Use MAsealant that meets the requirements of thisspecification when
21、 tested on mortar specimens in accordancewith 9.9 and 9.10.4.1.15 Use GA sealant that meets the requirements of thisspecification when tested on glass specimens in accordancewith 9.9-9.11.4.1.16 Use AA sealant that meets this specification whentested on aluminum specimens in accordance with 9.9 and9
22、.10.4.1.17 Use OA sealant that meets this specification whentested on substrates other than the standard substrates inaccordance with 9.9 and 9.10.5. Materials and Manufacture5.1 A single-component sealant shall be a uniform mixtureof a consistency suitable for immediate application by hand orpressu
23、re caulking gun or by hand tool. The sealant whencompletely cured shall form an elastomeric solid capable ofmaintaining a seal.5.2 A multicomponent chemically curing sealant shall befurnished in two or more components. The resulting mixtureshall be uniform and of a consistency suitable for immediate
24、application by hand or pressure caulking gun, or by hand tool.The sealant when completely cured shall form an elastomericsolid capable of maintaining a seal.6. General Requirements6.1 Stability:6.1.1 A single-component sealant, when stored in the origi-nal unopened container at temperatures of not m
25、ore than 27C(80F) shall be capable of meeting the requirements of thisspecification for at least 6 months after date of delivery.6.1.2 A multicomponent sealant, when stored in the originalunopened container at temperatures of not more than 27C(80F) shall be capable of meeting the requirements of thi
26、sspecification for at least 6 months after date of delivery.6.2 ColorThe color of the sealant, after curing 14 days ina laboratory controlled at 23 6 2C (73.4 6 3.6F) and 50 65 % relative humidity, shall be that color which has beenagreed upon between the purchaser and the supplier.6.3 The sealant s
27、hall be intended for use only on clean, drysurfaces. Where a primer is recommended by a manufacturerfor a specific surface, all tests on that surface shall include theprimer.NOTE 2The proper use of primers (or surface conditioners) inconnection with the application of sealants is described in detail
28、 in GuideC 1193. This guide also describes proper methods for joint design,back-up materials, surface preparation, tooling of sealant, and otherimportant procedures in sealant application in buildings.6.4 The same conditions of time, temperature, and humidityshall be used for cure of test specimens
29、for Test MethodsC 661, C 719, C 794, and C 1247.7. Significance and Use7.1 This specification covers several classifications of seal-ants as described in Section 4 for various applications. Itshould be recognized by the purchaser or design professionalthat not all sealants meeting this specification
30、 are suitable forall applications and all substrates. It is essential, therefore, thatthe applicable type, grade, class, and use be specified so thatthe proper classification of sealant is provided for the intendeduse. Test methods relate to special standard specimen sub-strates of mortar, glass, an
31、d aluminum. If tests are requiredusing substrates in addition to or other than the standard, theyshould be so specified for testing.8. Physical Requirements8.1 Rheological Properties:8.1.1 Grade P (pourable or selfleveling) sealant shall haveflow characteristics such that when tested in accordance w
32、ithTest Method C 639 it shall exhibit a smooth, level surface.(Refer to Types I and III in the test.)8.1.2 Grade NS (nonsag) or gunnable sealant shall haveflow characteristics such that when tested in accordance withTest Method C 639 it does not sag more than 4.8 mm (316 in.)in vertical displacement
33、. Also the sealant shall show nodeformation in horizontal displacement. (Refer to Types II andIV in the test.)8.2 Extrusion Rate:8.2.1 Type S (single component), Grade P (pourable orselfleveling) sealant shall have an extrusion rate of not less than10mL/min when tested in accordance with Test Method
34、C 1183, Procedure A.8.2.2 Type S (single component), Grade NS (nonsag orgunnable sealant) shall have an extrusion rate of not less than10 mL/min when tested in accordance with Test MethodC 1183, Procedure A.8.3 Application Life:8.3.1 Type M (multicomponent), Grade P (pourable orselfleveling) sealant
35、, when tested in accordance with TestC920082Method C 1183, ProcedureAshall be extrudable at a rate of notless than 10 mL/min 3 h after mixing.8.4 Hardness:8.4.1 Use T1(traffic) sealant shall have a hardness reading,after being properly cured, of not less than 25 when tested inaccordance with Test Me
36、thod C 661.8.4.2 Use T2(traffic) sealant shall have a hardness reading,after being properly cured, of less than 25 when tested inaccordance with Test Method C 661.8.4.3 Use NT (nontraffic) sealant shall have a hardnessreading, after being properly cured, of not less than 15 or morethan 50 when teste
37、d in accordance with Test Method C 661.8.5 Effects of Heat AgingThe sealant shall not lose morethan 7 % of its original weight or show any cracking orchalking when tested in accordance with Test Method C 1246.8.6 Tack-Free TimeThere shall be no transfer of thesealant to the polyethylene film when te
38、sted at 72 h inaccordance with Test Method C 679.8.7 Stain and Color ChangeThe sealant shall not causeany visible stain on the top surface of a white cement mortarbase when tested in accordance with Test Method C 510.8.8 Adhesion and Cohesion Under Cyclic MovementThetotal loss in bond and cohesion a
39、reas among the three speci-mens tested for each surface shall be no more than 9 cm2(112in.2) when tested in accordance with Test Method C 719 withstandard mortar, glass, and aluminum or any other specifiedsubstrates.8.9 Adhesion-in-PeelThe peel strength for each indi-vidual test shall not be less th
40、an 22.2 N (5 lbf) when tested inaccordance with Test Method C 794 with standard mortar,glass, and aluminum or any other specified substrate. Inaddition, the sealant shall show no more than 25 % adhesivebond loss for each individual test.NOTE 3Curing conditions are specified by all of the test method
41、scited. The manufacturer may request other conditions than those specifiedfor the curing period provided they meet the following requirements: ( 1)the curing period shall extend for 21 days; ( 2) the temperature during thecuring period shall not exceed 50C (122F); and (3) the amended curingcondition
42、s recommended by the manufacturer shall also be applied to thedurability, adhesion in peel, and ultraviolet radiation exposure tests.8.10 Adhesion-in-Peel for Use G Exposed to UltravioletExposure Through GlassThe peel strength for each indi-vidual test shall not have less than 22.2 N (5 lbf) and the
43、compound shall be no more than 25 % adhesive bond loss foreach individual test when tested in accordance with TestMethod C 794.8.11 Effects of Accelerated Weathering The sealant shallshow no cracks greater than those shown in Example #2 of Fig.1 in Test Method C 793 after the specified ultraviolet e
44、xposureand shall show no cracks greater than those shown in Example#2 of Fig. 2 in Test Method C 793 after exposure at coldtemperature and the bend test when tested in accordance withTest Method C 793.8.12 Effects of Continuous Immersion for Use I Sealants:8.12.1 Class 1After 6 weeks exposure, the t
45、otal loss inbond and cohesion areas among the specimens tested for eachsubstrate shall be no greater than 9.5 cm2(1.5 in.2) when testedaccording to Test Method C 1247 with standard glass, alumi-num, or any other substrate specified.8.12.2 Class 2After 10 weeks exposure, the total loss inbond and coh
46、esion areas among the specimens tested for eachsubstrate shall be no greater than 9.5 cm2(1.5 in.2) when testedaccording to Test Method C 1247 with standard glass, alumi-num, or any other substrate specified.9. Test Methods9.1 Standard Conditions for Laboratory TestsAll testsdescribed in the followi
47、ng paragraphs shall be performed in alaboratory controlled at 23 6 2C (73.4 6 3.6F) and 50 65 % relative humidity. The sealant sample shall be conditionedat this temperature and relative humidity for at least 24 h beforelaboratory tests are made.9.2 Rheological PropertiesTest Method C 639.9.3 Extrus
48、ion RateTest Method C 1183, Procedure A.9.4 Application LifeTest Method C 1183, Procedure A.9.5 HardnessTest Method C 661.9.6 Effects of Heat AgingTest Method C 12469.7 Tack-Free TimeTest Method C 679.9.8 Stain and Color ChangeTest Method C 510.9.9 Adhesion and Cohesion After Cyclic MovementTestMeth
49、od C 719.9.10 Adhesion-in-PeelTest Method C 794.9.11 Adhesion-in-Peel After Ultraviolet Exposure ThroughGlassTest Method C 794.9.12 Effects of Accelerated Weathering Test MethodC 793.9.13 Sealants Exposed to Continuous ImmersionTestMethod C 1247.10. Packaging and Marking10.1 Packaged materials that are certified by the manufac-turer to be in compliance with this specification shall be labeledas to type, class, grade, and use, in accordance with Section 7.10.2 All certification to this specification shall state time,tempera
