ASTM C920-2018 Standard Specification for Elastomeric Joint Sealants《弹性接缝剂的标准规格》.pdf

1、Designation: C920 14aC920 18Standard Specification forElastomeric Joint Sealants1This standard is issued under the fixed designation C920; 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 paren

2、theses 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 U.S. Department of Defense.1. Scope1.1 This ASTM specification covers the properties of a cured single-

3、 or multicomponent cold-applied elastomeric joint sealantfor sealing, caulking, or glazing operations on buildings, plazas, and decks for vehicular or pedestrian use, and types ofconstruction other than highway and airfield pavements and bridges.1.2 A sealant meeting the requirements of this specifi

4、cation shall be designated by the manufacturer to be one or more of thetypes, classes, grades, and uses defined in Section 7.1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.4 This standard is similar, but not identical,

5、 to ISO 11600.11600 and ISO 11618.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Org

6、anization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C510 Test Method for Staining and Color Change of Single- or Multicomponent Joint SealantsC639 Test Method for Rheological (Flow) Properties of Elastomeric SealantsC661 Test Method for Indentation Hardne

7、ss of Elastomeric-Type Sealants by Means of a DurometerC679 Test Method for Tack-Free Time of Elastomeric SealantsC717 Terminology of Building Seals and SealantsC719 Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)C793 Test Method for Effects

8、of Laboratory Accelerated Weathering on Elastomeric Joint SealantsC794 Test Method for Adhesion-in-Peel of Elastomeric Joint SealantsC1183 Test Method for Extrusion Rate of Elastomeric SealantsC1193 Guide for Use of Joint SealantsC1246 Test Method for Effects of Heat Aging on Weight Loss, Cracking,

9、and Chalking of Elastomeric Sealants After CureC1247 Test Method for Durability of Sealants Exposed to Continuous Immersion in LiquidsC1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus3. Terminology3.1 DefinitionsRefer to Terminology C717 for definitions of the fol

10、lowing terms used in this specification: adhesive failure,caulking, chemically curing sealant, cohesive failure, cure, cured, elastomeric, glazing, joint, primer, seal, sealant, and standardconditions.4. Classification of Sealants4.1 A sealant qualifying under this specification shall be classified

11、as to type, grade, class, and use as follows:4.1.1 Type SA single-component sealant.1 This specification is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.10 onSpecifications, Guides and Practices.Current edition appro

12、ved June 1, 2014Jan. 1, 2018. Published July 2014January 2018. Originally approved in 1979. Last previous edition approved in 2014 asC920 14.C920 14a. DOI: 10.1520/C0920-14A.10.1520/C0920-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at servi

13、ceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. B

14、ecauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 10

15、0 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.2 Type MA multicomponent sealant.4.1.3 Grade PA pourable or selfleveling sealant that has sufficient flow to form a smooth, level surface when applied in ahorizontal joint at 4.4C (40F).4.1.4 Grade NSA nonsag or gu

16、nnable sealant that permits application in joints on vertical surfaces without sagging orslumping when applied at temperatures between 4.4 and 50C (40 and 122F).4.1.5 Class 100/50A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand anincrease of at least 1

17、00 % and a decrease of at least 50 % of the joint width as measured at the time of application, and, in addition,meet all the requirements of this specification.4.1.6 Class 50A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increaseand decrease of a

18、t least 50 % of the joint width as measured at the time of application, and, in addition, meet all the requirementsof this specification.4.1.7 Class 35A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increaseand decrease of at least 35 % of the join

19、t width as measured at the time of application, and, in addition, meet all the requirementsof this specification.4.1.8 Class 25A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increaseand decrease of at least 25 % of the joint width as measured at t

20、he time of application, and, in addition, meet all the requirementsof this specification.4.1.9 Class 1212 A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand anincrease and decrease of at least 1212 % of the joint width as measured at the time of applicat

21、ion, and, in addition, meet all therequirements of this specification.4.1.10 Use T1Asealant designed for use in joints in pedestrian and vehicular traffic areas such as walkways, plazas, decks andparking garages where a higher durometer sealant is desired.4.1.11 Use T2Asealant designed for use in jo

22、ints in pedestrian and vehicular traffic areas such as walkways, plazas, decks andparking garages where a lower durometer sealant 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 parkin

23、g garages require appropriate design considerations including material selection, total joint design, manufacturer involvement and field testing.4.1.12 Use NTA sealant designed for use in joints in nontraffic areas.4.1.13 Use IA sealant designed for use in joints which are submerged continuously in

24、a liquid.4.1.14 Use MA sealant that meets the requirements of this specification when tested on mortar specimens in accordance with9.9 and 9.10.4.1.15 Use GA sealant that meets the requirements of this specification when tested on glass specimens in accordance with9.9 9.11.4.1.16 Use AA sealant that

25、 meets this specification when tested on aluminum specimens in accordance with 9.9 and 9.10.4.1.17 Use OAsealant that meets this specification when tested on substrates other than the standard substrates in accordancewith 9.9 and 9.10.5. Materials and Manufacture5.1 A single-component sealant shall

26、be a uniform mixture of a consistency suitable for immediate application by hand orpressure caulking gun or by hand tool. The sealant when completely cured shall form an elastomeric solid capable of maintaininga seal.5.2 A multicomponent chemically curing sealant shall be furnished in two or more co

27、mponents. The resulting mixture shall beuniform and of a consistency suitable for immediate application by hand or pressure caulking gun, or by hand tool. The sealantwhen completely cured shall form an elastomeric solid capable of maintaining a seal.6. General Requirements6.1 Stability: Shelf-life6.

28、1.1 Asingle-component sealant, when stored in the original unopened container at temperatures of not more than 27C (80F)shall be capable of meeting the requirements of this specification for at least 6 months after date of delivery.The shelf-life of thissealant shall be determined by its manufacture

29、r. When establishing the shelf-life, the manufacturer should also identify acceptableconditions of storage for the sealant.6.1.2 A multicomponent sealant, when stored in the original unopened container at temperatures of not more than 27C (80F)shall be capable of meeting the requirements of this spe

30、cification for at least 6 months after date of delivery.6.2 ColorThe color of the sealant, after curing 14 days in a laboratory controlled at standard conditions, shall be that colorwhich has been agreed upon between the purchaser and the supplier.6.3 The sealant shall be intended for use only on cl

31、ean, dry surfaces. Where a primer is recommended by a manufacturer fora specific surface, all tests on that surface shall include the primer.NOTE 2The proper use of primers (or surface conditioners) in connection with the application of sealants is described in detail in Guide C1193. ThisC920 182gui

32、de also describes proper methods for joint design, back-up materials, surface preparation, tooling of sealant, and other important procedures in sealantapplication in buildings.6.4 The same conditions of time, temperature, and humidity shall be used for cure of test specimens for Test Methods C661,C

33、719, C794, and C1247.7. Significance and Use7.1 This specification covers several classifications of sealants as described in Section 4 for various applications. It should berecognized by the purchaser or design professional that not all sealants meeting this specification are suitable for all appli

34、cationsand all substrates. It is essential, therefore, that the applicable type, grade, class, and use be specified so that the properclassification of sealant is provided for the intended use. Test methods relate to special standard specimen substrates of mortar,glass, and aluminum. If tests are re

35、quired using substrates in addition to or other than the standard, they should be so specified fortesting.8. Physical Requirements8.1 Rheological Properties:8.1.1 Grade P (pourable or selfleveling) sealant shall have flow characteristics such that when tested in accordance with TestMethod C639 it sh

36、all exhibit a smooth, level surface. (Refer to Types I and III in the test.)8.1.2 Grade NS (nonsag) or gunnable sealant shall have flow characteristics such that when tested in accordance with TestMethod C639 it does not sag more than 4.8 mm (316 in.) in vertical displacement. Also the sealant shall

37、 show no deformation inhorizontal displacement. (Refer to Types II and IV in the test.)8.2 Extrusion Rate:8.2.1 Type S (single component), Grade P (pourable or selfleveling) sealant shall have an extrusion rate of not less than10mL/min when tested in accordance with Test Method C1183, Procedure A.8.

38、2.2 Type S (single component), Grade NS (nonsag or gunnable sealant) shall have an extrusion rate of not less than 10 mL/minwhen tested in accordance with Test Method C1183, Procedure A.8.3 Application Life:8.3.1 Type M (multicomponent), Grade P(pourable or selfleveling) sealant, when tested in acco

39、rdance with Test Method C1183,Procedure A shall be extrudable at a rate of not less 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 Method C661.8.4.2 Use T2 (

40、traffic) sealant shall have a hardness reading, after being properly cured, of less than 25 when tested in accordancewith Test Method C661.8.4.3 Use NT (nontraffic) sealant shall have a hardness reading, after being properly cured, of less than 60 when tested inaccordance with Test Method C661.8.5 E

41、ffects of Heat AgingThe sealant shall not lose more than 7 % of its original weight or show any cracking or chalkingwhen tested in accordance with Test Method C1246.8.6 Tack-Free TimeThere shall be no transfer of the sealant to the polyethylene film when tested at 72 h in accordance withTest Method

42、C679.8.7 Stain and Color ChangeThe sealant shall not cause any visible stain on the top surface of a white cement mortar basewhen tested in accordance with Test Method C510.8.8 Adhesion and Cohesion Under Cyclic MovementThe total loss in bond and cohesion areas among the three specimenstested for ea

43、ch surface shall be no more than 9 cm2 (112 in.2) when tested in accordance with Test Method C719 with standardmortar, glass, and aluminum or any other specified substrates.8.9 Adhesion-in-PeelThe peel strength for each individual test shall not be less than 22.2 N (5 lbf) when tested in accordancew

44、ith Test Method C794 with standard mortar, glass, and aluminum or any other specified substrate. In addition, the sealant shallshow no more than 25 % adhesive bond loss for each individual test.NOTE 3Curing conditions are specified by all of the test methods cited. The manufacturer may request other

45、 conditions than those specified for thecuring period provided they meet the following requirements: (1) the curing period shall extend for 21 days; (2) the temperature during the curing periodshall not exceed 50C (122F); and (3) the amended curing conditions recommended by the manufacturer shall al

46、so be applied to the durability, adhesionin peel, and ultraviolet radiation exposure tests.8.10 Adhesion-in-Peel for Use G Exposed to Ultraviolet Exposure Through GlassThe peel strength for each individual testshall not have less than 22.2 N (5 lbf) and the compound shall be no more than 25 % adhesi

47、ve bond loss for each individual testwhen tested in accordance with Test Method C794 modified to include 200 h in an accelerated weathering device followed by 7days immersion in distilled water.C920 1838.10.1 Exposure ApparatusThe exposure apparatus shall be one of the three types of laboratory acce

48、lerated weatheringdevices described in Practice C1442, that use either xenon arc, fluorescent UV or open flame carbon arc radiation. Consult PracticeC1442 for the differences in test parameters among the devices. Because of differences in test conditions, test results may differwith the type of devi

49、ce used. The choice of device shall be by mutual agreement among the interested parties.8.10.1.1 When peel adhesion is to be tested on glass substrate specimens after ultraviolet exposure through glass, place thespecimens in the weathering device with the sealant surface facing away from the light source after 21 days of cure at laboratoryconditions. Test conditions in each type of device are in accordance with the procedures in C1442, Section 7 on Apparatus, exceptthat the xenon arc and open flame carbon arc devices shall be opera