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ASTM C920-05

(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
30-Apr-2005
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.10 - Specifications, Guides and Practices
Current Stage
Ref Project

Relations

Replaces
ASTM C920-02 - Standard Specification for Elastomeric Joint Sealants
Effective Date
01-May-2005
Replaced By
ASTM C920-08 - Standard Specification for Elastomeric Joint Sealants
Effective Date
15-Jul-2008
Referred By
ASTM C1472-16(2022) - Standard Guide for Calculating Movement and Other Effects When Establishing Sealant Joint Width
Effective Date
01-May-2005
Referred By
ASTM C1021-08(2023) - Standard Practice for Laboratories Engaged in Testing of Building Sealants
Effective Date
01-May-2005
Referred By
ASTM C1635-22 - Standard Test Method to Evaluate Adhesion/Cohesion Properties of a Sealant at Fixed Extension
Effective Date
01-May-2005
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
01-May-2005
Referred By
ASTM C981-20 - Standard Guide for Design of Built-Up Bituminous Membrane Waterproofing Systems for Building Decks
Effective Date
01-May-2005
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
01-May-2005
Referred By
ASTM C1781/C1781M-21 - Standard Test Method for Surface Infiltration Rate of Permeable Unit Pavement Systems
Effective Date
01-May-2005
Referred By
ASTM E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
Effective Date
01-May-2005
Referred By
ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
Effective Date
01-May-2005
Referred By
ASTM E2398/E2398M-19 - Standard Test Method for Water Capture and Media Retention of Geocomposite Drain Layers for Vegetative (Green) Roof Systems
Effective Date
01-May-2005
Referred By
ASTM C679-15(2022) - Standard Test Method for Tack-Free Time of Elastomeric Sealants
Effective Date
01-May-2005
Referred By
ASTM C1248-22 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
Effective Date
01-May-2005
Referred By
ASTM C1481-12(2017) - Standard Guide for Use of Joint Sealants with Exterior Insulation and Finish Systems (EIFS)
Effective Date
01-May-2005

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ASTM C920-05 - Standard Specification for Elastomeric Joint SealantsASTM C920-05 - Standard Specification for Elastomeric Joint Sealants
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ASTM C920-05 - 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 withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 920 – 05
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 C 1183 Test Method for Extrusion Rate of Elastomeric
Sealants
1.1 This specification covers the properties of a cured
C 1193 Guide for Use of Joint Sealants
single- or multicomponent cold-applied elastomeric joint seal-
C 1246 Test Method for Effects of Heat Aging on Weight
ant for sealing, caulking, or glazing operations on buildings,
Loss,CrackingandChalkingofElastomericSealantsAfter
plazas, and decks for vehicular or pedestrian use, and types of
Cure
construction other than highway and airfield pavements and
C 1247 Test Method for Durability of Sealants Exposed to
bridges.
Constant Immersion in Liquids
1.2 A sealant meeting the requirements of this specification
shall be designated by the manufacturer to be one or more of
3. Terminology
the types, classes, grades, and uses defined in Section 7.
3.1 Definitions—RefertoTerminologyC 717fordefinitions
1.3 The values stated in SI units are to be regarded as the
of the following terms used in this specification: adhesive
standard. The values given in parentheses are for information
failure, caulking, chemically curing sealant, cohesive failure,
only.
cure, cured, elastomeric, glazing, joint, primer, seal, sealant.
1.4 This standard is similar, but not identical, to ISO 11600.
4. Classification of Sealants
2. Referenced Documents
2
4.1 A sealant qualifying under this specification shall be
2.1 ASTM Standards:
classified as to type, grade, class, and use as follows:
C 510 Test Method for Staining and Color Change of
4.1.1 Type S—A single-component sealant.
Single- or Multicomponent Joint Sealants
4.1.2 Type M—A multicomponent sealant.
C 639 Test Method for Rheological (Flow) Properties of
4.1.3 Grade P—A pourable or selfleveling sealant that has
Elastomeric Sealants
sufficient flow to form a smooth, level surface when applied in
C 661 Test Method for Indentation Hardness of
a horizontal joint at 4.4°C (40°F).
Elastomeric-Type Sealants by Means of a Durometer
4.1.4 Grade NS—Anonsag or gunnable sealant that permits
C 679 Test Method for Tack-Free Time of Elastomeric
application in joints on vertical surfaces without sagging or
Sealants
slumping when applied at temperatures between 4.4 and 50°C
C 717 Terminology of Building Seals and Sealants
(40 and 122°F).
C 719 Test Method for Adhesion and Cohesion of Elasto-
4.1.5 Class 100/50—Asealantthatwhentestedforadhesion
meric Joint Sealants Under Cyclic Movement (Hockman
and cohesion under cyclic movement (8.8) shall withstand an
Cycle)
increase of at least 100 % and a decrease of at least 50 % of the
C 793 Test Method for Effects of Accelerated Weathering
joint width as measured at the time of application, and, in
on Elastomeric Joint Sealants
addition, meet all the requirements of this specification.
C 794 Test Method for Adhesion-in-Peel of Elastomeric
4.1.6 Class 50—Asealant that when tested for adhesion and
Joint Sealants
cohesion under cyclic movement (8.8) shall withstand an
increase and decrease of at least 50 % of the joint width as
1
This specification is under the jurisdiction of ASTM Committee C24 on
measured at the time of application, and, in addition, meet all
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.10
the requirements of this specification.
on Specifications, Guides and Practices.
4.1.7 Class 35—Asealant that when tested for adhesion and
Current edition approved May 1, 2005. Published June 2005. Originally
approved in 1979. Last previous edition approved in 2002 as C 920 – 02.
cohesion under cyclic movement (8.8) shall withstand an
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
increase and decrease of at least 35 % of the joint width as
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
measured at the time of application, and, in addition, meet all
Standards volume information, refer to the standard’s Document Summary page on
the requirements of this specification.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C920–05
4.1.8 Class 25—Asealant that when tested for adhesion and 6.3 The sealant shall be intended for use only on clean, dry
cohesion under cyclic movement (8.8) shall withstand an surfaces. Whe
...

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