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ASTM C920-01

(Specification)

Standard Specification for Elastomeric Joint Sealants

Standard Specification for Elastomeric Joint Sealants

SCOPE
1.1 This specification covers the properties of a cured single- or multicomponent cold-applied elastomeric joint sealant for sealing, caulking, or glazing operations on buildings, plazas, and decks for vehicular or pedestrian use, and types of construction other than highway and airfield pavements and bridges.
1.2 A sealant meeting the requirements of this specification shall be designated by the manufacturer to be one or more of the types, 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, to ISO 11600.

General Information

Status
Historical
Publication Date
09-Jan-2002
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.20 - General Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM C920-98e1 - Standard Specification for Elastomeric Joint Sealants
Effective Date
10-Jan-2002
Replaced By
ASTM C920-02 - Standard Specification for Elastomeric Joint Sealants
Effective Date
10-Jan-2002
Referred By
ASTM C1472-16(2022) - Standard Guide for Calculating Movement and Other Effects When Establishing Sealant Joint Width
Effective Date
10-Jan-2002
Referred By
ASTM F3097-22 - Standard Practice for Installation of an Outside Sewer Service Cleanout through a Minimally Invasive Small Bore Vacuum Excavation and Same Day Restoration
Effective Date
10-Jan-2002
Referred By
ASTM C1127/C1127M-15(2023) - Standard Guide for Use of High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane with an Integral Wearing Surface
Effective Date
10-Jan-2002
Referred By
ASTM C1021-08(2023) - Standard Practice for Laboratories Engaged in Testing of Building Sealants
Effective Date
10-Jan-2002
Referred By
ASTM C1635-22 - Standard Test Method to Evaluate Adhesion/Cohesion Properties of a Sealant at Fixed Extension
Effective Date
10-Jan-2002
Referred By
ASTM C981-20 - Standard Guide for Design of Built-Up Bituminous Membrane Waterproofing Systems for Building Decks
Effective Date
10-Jan-2002
Referred By
ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
Effective Date
10-Jan-2002
Referred By
ASTM C840-20 - Standard Specification for Application and Finishing of Gypsum Board
Effective Date
10-Jan-2002
Referred By
ASTM E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
Effective Date
10-Jan-2002
Referred By
ASTM C679-15(2022) - Standard Test Method for Tack-Free Time of Elastomeric Sealants
Effective Date
10-Jan-2002
Referred By
ASTM C1248-22 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
Effective Date
10-Jan-2002
Referred By
ASTM C919-22 - Standard Practice for Use of Sealants in Acoustical Applications
Effective Date
10-Jan-2002
Referred By
ASTM C898/C898M-09(2017) - Standard Guide for Use of High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane with Separate Wearing Course
Effective Date
10-Jan-2002

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ASTM C920-01 - Standard Specification for Elastomeric Joint SealantsASTM C920-01 - Standard Specification for Elastomeric Joint Sealants
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ASTM C920-01 - Standard Specification for Elastomeric Joint Sealants
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 920 – 01
Standard Specification for
1
Elastomeric Joint Sealants
This standard is issued under the fixed designation C 920; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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. Scope Loss, Cracking and Chalking of Elastomeric Sealants After
2
Cure
1.1 This specification covers the properties of a cured
C 1247 Test Method for Durability of Sealants Exposed to
single- or multicomponent cold-applied elastomeric joint seal-
2
Constant Immersion in Liquids
ant for sealing, caulking, or glazing operations on buildings,
plazas, and decks for vehicular or pedestrian use, and types of
3. Terminology
construction other than highway and airfield pavements and
3.1 Definitions—Refer to Terminology C 717 for definitions
bridges.
of the following terms used in this specification: adhesive
1.2 A sealant meeting the requirements of this specification
failure, caulking, chemically curing sealant, cohesive failure,
shall be designated by the manufacturer to be one or more of
cure, cured, elastomeric, glazing, joint, primer, seal, sealant.
the types, classes, grades, and uses defined in Section 7.
1.3 The values stated in SI units are to be regarded as the
4. Classification of Sealants
standard. The values given in parentheses are for information
4.1 A sealant qualifying under this specification shall be
only.
classified as to type, grade, class, and use as follows:
4.1.1 Type S—A single-component sealant.
2. Referenced Documents
4.1.2 Type M—A multicomponent sealant.
2.1 ASTM Standards:
4.1.3 Grade P—A pourable or selfleveling sealant that has
C 510 Test Method for Staining and Color Change of
2
sufficient flow to form a smooth, level surface when applied in
Single- or Multicomponent Joint Sealants
a horizontal joint at 4.4°C (40°F).
C 639 Test Method for Rheological (Flow) Properties of
2
4.1.4 Grade NS—A nonsag or gunnable sealant that permits
Elastomeric Sealants
application in joints on vertical surfaces without sagging or
C 661 Test Method for Indentation Hardness of
2
slumping when applied at temperatures between 4.4 and 50°C
Elastomeric-Type Sealants by Means of a Durometer
(40 and 122°F).
C 679 Test Method for Tack-Free Time of Elastomeric
2
4.1.5 Class 100/50—A sealant that when tested for adhesion
Sealants
2 and cohesion under cyclic movement (8.8) shall withstand an
C 717 Terminology of Building Seals and Sealants
increase of at least 100 % and a decrease of at least 50 % of the
C 719 Test Method for Adhesion and Cohesion of Elasto-
joint width as measured at the time of application, and, in
meric Joint Sealants Under Cyclic Movement (Hockman
2 addition, meet all the requirements of this specification.
Cycle)
4.1.6 Class 50—A sealant that when tested for adhesion and
C 793 Test Method for Effects of Accelerated Weathering
2 cohesion under cyclic movement (8.8) shall withstand an
on Elastomeric Joint Sealants
increase and decrease of at least 50 % of the joint width as
C 794 Test Method for Adhesion-in-Peel of Elastomeric
2 measured at the time of application, and, in addition, meet all
Joint Sealants
the requirements of this specification.
C 1183 Test Method for Extrusion Rate of Elastomeric
2 4.1.7 Class 35—A sealant that when tested for adhesion and
Sealants
2 cohesion under cyclic movement (8.8) shall withstand an
C 1193 Guide for Use of Joint Sealants
increase and decrease of at least 35 % of the joint width as
C 1246 Test Method for Effects of Heat Aging on Weight
measured at the time of application, and, in addition, meet all
the requirements of this specification.
1
This specification is under the jurisdiction of ASTM Committee C24 on
4.1.8 Class 25—A sealant that when tested for adhesion and
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20
cohesion under cyclic movement (8.8) shall withstand an
on General Sealant Standards.
Current edition approved May 10, 2001. Published May 2001. Originally increase and decrease of at least 25 % of the joint width as
e1
published as C 920 – 79. Last previous edition C 920 – 98 .
measured at the time of application, and, in addition, meet all
2
Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C 920
C 1193. This guide also describes proper methods for joint design,
the requirements of this specification.
1 back-up materials, surface preparation, tooling of sealant, and other
4.1.9 Cla
...

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4.1 Excessive sealant slump or sag in a vertical joint may cause improper bead shape or inadequate sealant thickness in the completed joint. Slump measurements, as described in this test method, serve to evaluate only this application characteristic; they do not predict the performance capability of the sealant after installation.
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1.1 This guide describes the use of a cold liquid-applied sealant for joint sealing applications. Including joints on buildings and related adjacent areas, such as plazas, decks, and pavements for vehicular or pedestrian use, and types of construction other than highways and airfield pavements and bridges. Information in this guide is primarily applicable to a single and multi-component, cold liquid-applied joint sealant and secondarily to a precured sealant when used with a properly prepared joint opening and substrate surfaces.  
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1.6 The values stated in SI units are to be regarded as the standard. The values given in parenthesis are provided for information only.  
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Standard Test Method for Effects of Laboratory Accelerated Weathering on Elastomeric Joint Sealants

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5.1 It is known that solar radiation contributes to the degradation of sealants in exterior building joints. The use of a laboratory accelerated weathering machine with actinic radiation, moisture and heat appears to be a feasible means to give indications of early degradation by the appearance of sealant cracking. However, simulated weather factors in combination with extension may produce more severe degradation than weather factors only. Therefore, the effect of the weathering test is made more sensitive by the addition of the bending of the specimen at cold temperature.
SCOPE
1.1 This test method covers a laboratory procedure for determining the effects of accelerated weathering on cured-in-place elastomeric joint sealants (single- and multicomponent) for use in building construction.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other ASTM committees or other organizations.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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