1、Designation: C834 17Standard Specification forLatex Sealants1This standard is issued under the fixed designation C834; 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 indicates the
2、 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 specification covers one component latex sealantsused for sealing joints in bui
3、lding construction.1.2 A sealant meeting the requirements of this specificationshall be classified by the manufacturer to be one of the typesand grades defined in Section 4.1.3 The values stated in SI units are to be regarded as thestandard. The inch-pound in parenthesis are provided forinformation
4、purposes only.1.4 The following precautionary caveat pertains only to thetest method portion, Section 10, of this Specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appr
5、opriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE 1Currently, there is no ISO standard similar to this specifica-tion.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC732 Test Method for Aging Eff
6、ects of Artificial Weatheringon Latex SealantsC734 Test Method for Low-Temperature Flexibility of LatexSealants After Artificial WeatheringC736 Test Method for Extension-Recovery and Adhesion ofLatex SealantsC1183 Test Method for Extrusion Rate of Elastomeric Seal-antsC1193 Guide for Use of Joint Se
7、alantsC1241 Test Method for Volume Shrinkage of Latex SealantsDuring CureD2202 Test Method for Slump of SealantsD2203 Test Method for Staining from SealantsD2377 Test Method for Tack-Free Time of Caulking Com-pounds and Sealants3. Terminology3.1 DefinitionsDefinitions of the following terms apply to
8、this specification and are found in Terminology C717: adhesivefailure (adhesion loss), cure, joint, latex sealant, sealant,shrinkage (volume), standard conditions, and substrate.4. Classification of Sealants4.1 A sealant qualifying under this specification shall beclassified by type and grade as fol
9、lows:4.1.1 Type OPAn opaque sealant containing color pig-ments or extender pigments, or both, that has no more than30 % volume shrinkage (see 10.1.3).4.1.2 Type CA clear or translucent sealant that has nomore than 50 % volume shrinkage (see 10.1.3).4.1.3 Grade 18CA sealant that meets the requirement
10、sfor low temperature flexibility (see 7.1) when tested at 18C(0F).4.1.4 Grade 0CA sealant that meets the requirements forlow temperature flexibility (see 7.1) when tested at 0C (32F).4.1.5 Grade NFA sealant that does not meet the require-ments for low temperature flexibility of Grade 0C (see 4.1.4).
11、5. Materials and Manufacture5.1 The sealant shall be composed of latex formulated withappropriate fillers, pigments, and chemical additives to result inconformance to this specification.5.2 All material and workmanship shall be in accordancewith good commercial practice. The producer is permitted aw
12、ide latitude in choice of raw materials for making theseproducts. Consequently, there is no implication that the com-pounds are equivalent in all physical properties.5.3 The manufacturing process shall be such as will ensurea homogeneous mix, free of defects that would affectserviceability, and prov
13、ide a consistency suitable for immedi-ate application.1This specification is under the jurisdiction of ASTM Committee C24 onBuilding Seals and Sealants and is the direct responsibility of Subcommittee C24.10on Specifications, Guides and Practices.Current edition approved March 1, 2017. Published Mar
14、ch 2017. Originallyapproved in 1976. Last previous edition approved in 2014 as C834 14. DOI:10.1520/C0834-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the sta
15、ndards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the De
16、cision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.16. General Requirements6.1 The shelf life of this sealant shall be determined by itsmanufacturer. When establishing the s
17、helf life, the manufac-turer should also identify acceptable conditions of storage forthe sealant.6.2 After 21 days cure at standard conditions, the color ofthe sealant shall be that color that has been agreed uponbetween the purchaser and the supplier.6.3 The sealant is intended for application to
18、clean substratesurfaces only.7. Physical Properties7.1 The sealant shall conform to the physical requirementsspecified in Table 1 according to type and grade.8. Significance and Use8.1 This specification covers two types and three grades oflatex sealants as described in Section 4 that are formulated
19、 forgeneral caulking and sealing operations in building construc-tion. It should be recognized by the user that not all sealantsmeeting this specification are suitable for all applications andall substrates. It is essential, therefore, that the type and gradebe specified for proper description of a
20、sealant. Test methodsrelate to special standard substrates of glass, wood and alumi-num. If tests are required using substrates in addition to orother than standard, they should be so specified for testing.8.2 Refer to Guide C1193 for information on the proper useof sealants meeting this specificati
21、on.9. Sampling9.1 The sealant to be tested for conformance to this speci-fication shall be taken directly from a randomly selectedcontainer as commercially supplied by the manufacturer.10. Test Methods10.1 Perform all of the following tests at standard condi-tions. Condition sealant samples for at l
22、east5hatstandardconditions before any tests are conducted.10.1.1 Extrudability After AgingTest Method C1183, Pro-cedure B.10.1.2 Artificial WeatheringTest Method C732 (500 hexposure).10.1.3 Volume ShrinkageTest Method C1241.10.1.4 Low-Temperature FlexibilityTest Method C734(500 h Artificial Weatheri
23、ng exposure). For 0C sealants, thetest method is modified to perform the bend at 0 6 1C (32 62F).NOTE 2The exposure times for the accelerated weathering tests usedin this specification are meant to ensure a minimum level of performanceand cannot be used to estimate service life in any particular loc
24、ation.10.1.5 Extension-Recovery and AdhesionTest MethodC736.10.1.6 SlumpTest Method D2202 modified to advance theplunger to its maximum extent, leaving a solid cylinder ofsealing compound 38 mm (112 in.) in diameter and 10 mm (38in.) thick, ready to flow down the face of the instrument.10.1.7 Staini
25、ngTest Method D2203.10.1.8 Tack-Free TimeTest Method D2377 modified toexpose the specimen for 1 h before applying polyethylene stripfor Type OP and modified to expose the specimen for 24 hbefore applying the polyethylene strip for Type C sealants.11. Packaging11.1 Unless otherwise specified in the c
26、ontract or order, thematerial shall be packaged in standard commercial containersso constructed as to ensure acceptance by common or othercarrier for safe transportation at the lowest rate to the point ofdelivery.11.2 Shipping containers shall be marked with the name,grade, and quantity of the mater
27、ial contained therein, as definedby the contract or order under which shipments are made. Thename of the manufacturer, the lot and batch number of thecontract order, and the date of manufacture shall also beshown.12. Keywords12.1 latex sealantTABLE 1 Physical RequirementsTest RequirementsASTMTest Me
28、thodExtrudability 2 g/s, minimum C1183, Proce-dure BArtificial weathering: 500 h C732Wash-out none, after weatheringSlump none, after weatheringCracking none, after weatheringDiscoloration as acceptable to purchaserAdhesion loss 25 % max (estimated on the basisof a total possible bond areaof 45.16 c
29、m2(7 in.2)Volume shrinkage:Type OP 30 % max C1241Type C 50 % maxLow-temperature flex-ibility:After 500 h Artificial Weathering expo-sureGrades 18 and 0 no cracking through to substrate oradhesion lossC734AGrade NF noneRecovery 75 % min (average of all specimens) C736Adhesion loss 25 % or 19.35 cm2(3
30、 in.2) max (oftotal bond area of all specimens)C736Slump 4 mm (0.15 in.) max(on each specimen)D2202BStain index 3 max D2203Tack-free time no material adhering to plastic strip D2377CColor as acceptable to purchaser 6.2ASee 10.1.4 for modification of this test method for 0C.BSee 10.1.6 for modificati
31、on to this test method.CSee 10.1.8 for modification to this test method.C834 172ASTM International 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 val
32、idity 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 com
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