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ASTM C920-98e1

(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

Replaced By
ASTM C920-01 - Standard Specification for Elastomeric Joint Sealants
Effective Date
10-Jan-2002
Referred By
ASTM C1781/C1781M-21 - Standard Test Method for Surface Infiltration Rate of Permeable Unit Pavement Systems
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 C920-98e1 - Standard Specification for Elastomeric Joint SealantsASTM C920-98e1 - Standard Specification for Elastomeric Joint Sealants
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ASTM C920-98e1 - 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.
e1
Designation: C 920 – 98
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
e NOTE—Editorial changes were made in July 2000.
1. Scope C 1246 Test Method for Effects of Heat Aging on Weight
Loss, Cracking and Chalking of Elastomeric Sealants After
1.1 This specification covers the properties of a cured
2
Cure
single- or multicomponent cold-applied elastomeric joint seal-
C 1247 Test Method for Sealants Exposed to Constant
ant for sealing, caulking, or glazing operations on buildings,
2
Immersion in Liquids
plazas, and decks for vehicular or pedestrian use, and types of
construction other than highway and airfield pavements and
3. Terminology
bridges.
3.1 Definitions—Refer to Terminology C 717 for definitions
1.2 A sealant meeting the requirements of this specification
of the following terms used in this specification: adhesive
shall be designated by the manufacturer to be one or more of
failure, caulking, chemically curing sealant, cohesive failure,
the types, classes, grades, and uses defined in Section 7.
cure, cured, elastomeric, glazing, joint, primer, seal, sealant.
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Classification of Sealants
only.
4.1 A sealant qualifying under this specification shall be
2. Referenced Documents classified as to type, grade, class, and use as follows:
4.1.1 Type S—A single-component sealant.
2.1 ASTM Standards:
4.1.2 Type M—A multicomponent sealant.
C 510 Test Method for Staining and Color Change of
2 4.1.3 Grade P—A pourable or selfleveling sealant that has
Single- or Multicomponent Joint Sealants
sufficient flow to form a smooth, level surface when applied in
C 639 Test Method for Rheological (Flow) Properties of
2 a horizontal joint at 4.4°C (40°F).
Elastomeric Sealants
4.1.4 Grade NS—A nonsag or gunnable sealant that permits
C 661 Test Method for Indentation Hardness of
2 application in joints on vertical surfaces without sagging or
Elastomeric-Type Sealants by Means of a Durometer
slumping when applied at temperatures between 4.4 and 50°C
C 679 Test Method for Tack-Free Time of Elastomeric
2 (40 and 122°F).
Sealants
2 4.1.5 Class 25—A sealant that when tested for adhesion and
C 717 Terminology of Building Seals and Sealants
cohesion under cyclic movement (8.8) shall withstand an
C 719 Test Method for Adhesion and Cohesion of Elasto-
increase and decrease of at least 25 % of the joint width as
meric Joint Sealants Under Cyclic Movement (Hockman
2 measured at the time of application, and, in addition, meet all
Cycle)
the requirements of this specification.
C 793 Test Method for Effects of Accelerated Weathering
1
2 4.1.6 Class 12 ⁄2 —A sealant that when tested for adhesion
on Elastomeric Joint Sealants
and cohesion under cyclic movement (8.8) shall withstand an
C 794 Test Method for Adhesion-in-Peel of Elastomeric
1
2 increase and decrease of at least 12 ⁄2 % of the joint width as
Joint Sealants
measured at the time of application, and, in addition, meet all
C 1183 Test Method for Extrusion Rate of Elastomeric
2 the requirements of this specification.
Sealants
2 4.1.7 Use T—A sealant designed for use in joints in pedes-
C 1193 Guide for Use of Joint Sealants
trian and vehicular traffic areas such as walkways, plazas,
decks and parking garages.
1
4.1.8 Use NT—A sealant designed for use in joints in
This specification is under the jurisdiction of ASTM Committee C-24 on
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20
nontraffic areas.
on General Sealant Standards.
4.1.9 Use I—A sealant designed for use in joints which are
Current edition approved March 10, 1998. Published July 1998. Originally
submerged continuously in a liquid.
published as C 920 – 79. Last previous edition C 920 – 95.
2
Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C 920
4.1.10 Use M—A sealant that meets the requirements of this the applicable type, grade, class, and use be specified so that
specification when tested on mortar specimens in accordance the proper classification of sealant is provided for the intended
with 9.9 and 9.10. use. Test methods relate to special standard specimen sub-
4.1.11 Use G—A sealant that meets the requirements of this strates of
...

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5.1 Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of shrinkage, and sealant performance because of the loss of functional sealant components. Exposure to high-temperature environments will accelerate the loss of volatiles.  
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SIGNIFICANCE AND USE
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.
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1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
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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.  
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SIGNIFICANCE AND USE
5.1 Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. This procedure is not intended to simulate an actual use condition, but it will give some indication of the flexibility and adhesion of a tape at low temperature. It can serve to differentiate between flexible tapes that can take some movement and those that tend to harden or embrittle on aging and crack or lose adhesion when flexed at low temperature. It will also aid in identifying sealants that have poor flexibility because they are overextended and contain a low level of binder as well as those sealants having binders that will embrittle at low temperature.
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