ASTM C1756-17

Standard Guide for Comparing Seal or Sealant Behavior to Reference Photographs

SIGNIFICANCE AND USE
4.1 This guide is intended to be used in evaluating sealant conditions that occur in service, along with other diagnostic techniques in failure analysis. These standard reference photographs have been selected and approved through ASTM's consensus balloting process to illustrate terms defined by Committee C24.  
4.2 Not all of the terms illustrated here are failures, and there are other failure mechanisms that affect sealants that are not discussed in this guide. This guide is intended to be one of a number of sources of information used in the evaluation of sealant behavior.
SCOPE
1.1 This guide provides photographs that illustrate sealant behavior terms that have been defined by Committee C24.  
1.2 When available, photographs that better illustrate these terms, or that illustrate additional terms defined by Committee C24, will be included in future editions of this standard. Photographs for consideration may be submitted to the committee using the form in Appendix X1.  
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2017
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.10 - Specifications, Guides and Practices

Relations

• Replaces: ASTM C1756-14 - Standard Guide for Comparing Sealant Behavior to Reference Photographs
• Effective Date: 01-Sep-2017
• Replaced By: ASTM C1756-17a - Standard Guide for Comparing Seal or Sealant Behavior to Reference Photographs
• Effective Date: 01-Nov-2017

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1756 − 17
Standard Guide for
Comparing Seal or Sealant Behavior to Reference
1
Photographs
This standard is issued under the fixed designation C1756; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 This guide provides photographs that illustrate sealant 2.1 ASTM Standards:
behavior terms that have been defined by Committee C24. C717Terminology of Building Seals and Sealants
1.2 When available, photographs that better illustrate these
3. Terminology
terms, or that illustrate additional terms defined by Committee
3.1 The terms used in this guide are defined inTerminology
C24, will be included in future editions of this standard.
C717.
Photographs for consideration may be submitted to the com-
mittee using the form in Appendix X1.
4. Significance and Use
1.3 Thecommitteewithjurisdictionoverthisstandardisnot
4.1 This guide is intended to be used in evaluating sealant
aware of any comparable standards published by other orga-
conditions that occur in service, along with other diagnostic
nizations.
techniques in failure analysis. These standard reference photo-
1.4 This standard does not purport to address all of the
graphs have been selected and approved through ASTM’s
safety concerns, if any, associated with its use. It is the
consensus balloting process to illustrate terms defined by
responsibility of the user of this standard to establish appro-
Committee C24.
priate safety, health and environmental practices and deter-
4.2 Not all of the terms illustrated here are failures, and
mine the applicability of regulatory limitations prior to use.
there are other failure mechanisms that affect sealants that are
1.5 This international standard was developed in accor-
not discussed in this guide. This guide is intended to be one of
dance with internationally recognized principles on standard-
a number of sources of information used in the evaluation of
ization established in the Decision on Principles for the
sealant behavior.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Reference Photographs
Barriers to Trade (TBT) Committee.
5.1 Figs. 1-9 present a standard reference photograph for
each of the terms defined inTerminology C717, reprinted with
their definitions.
1
ThisguideisunderthejurisdictionofASTMCommitteeC24onBuildingSeals
and Sealants and is the direct responsibility of Subcommittee C24.10
2
onSpecifications, Guides and Practices. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2017. Published September 2017. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2011. Last previous edition approved in 2014 as C1756-14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1756-17. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1756 − 17
6. Keywords
6.1 adhesion failure; chalking; cohesion failure; crazed; dirt
pick-up; elastomeric joint sealant; fluid migration; reversion;
rundown; sag
1

---------------------- Page: 2 ----------------------
C1756 − 17
adhesion failure, n—in building construction, failure of the bond between a
sealant and a substrate.
Discussion—This definition pertains to interfacial adhesion failure, a lack of
bond at the interface between the materials. Interphasal adhesion failure, within
the sealant or substrate near the interface, is less common and may appear to be
cohesive failure, n—in building construction, failure characterized by rupture
interfacial without the use of magnification.
within the sealant.
FIG. 1 Adhesion Failure
FIG. 3 Cohesive Failure
chalking, v—in building construction, formation of a powder on the surface of a
crazed, adj—in building construction, having a random network of cracks in a
sealant that is caused by the disintegration of the polymer or binding medium due
sealant surface which do not penetrate through the body of the material.
to weathering.
FIG. 4 Crazed
FIG. 2 Chalking
2

---------------------- Page: 3 ----------------------
C1756 − 17
dirt pick-up, n—in building construction, soiling caused by a foreign material
other than micro-organism growth that is deposited on, adhered to, or embedded
into a sealant.
reversion, n—in building construction in joint sealing, a loss of elastomeric
FIG. 5 Dirt Pick-up
properties and a decrease in durometer h
...

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. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: C1756 − 14 C1756 − 17
Standard Guide for
Comparing Seal or Sealant Behavior to Reference
1
Photographs
This standard is issued under the fixed designation C1756; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This guide provides photographs that illustrate sealant behavior terms that have been defined by Committee C24.
1.2 When available, photographs that better illustrate these terms, or that illustrate additional terms defined by Committee C24,
will be included in future editions of this standard. Photographs for consideration may be submitted to the committee using the
form in Appendix X1.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by 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 safety, health and healthenvironmental 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
3. Terminology
3.1 The terms used in this guide are defined in Terminology C717.
4. Significance and Use
4.1 This guide is intended to be used in evaluating sealant conditions that occur in service, along with other diagnostic
techniques in failure analysis. These standard reference photographs have been selected and approved through ASTM’s consensus
balloting process to illustrate terms defined by Committee C24.
4.2 Not all of the terms illustrated here are failures, and there are other failure mechanisms that affect sealants that are not
discussed in this guide. This guide is intended to be one of a number of sources of information used in the evaluation of sealant
behavior.
5. Reference Photographs
5.1 Figs. 1-9 present a standard reference photograph for each of the terms defined in Terminology C717, reprinted with their
definitions.
6. Keywords
6.1 adhesion failure; chalking; cohesion failure; crazed; dirt pick-up; elastomeric joint sealant; fluid migration; reversion;
rundown; sag
1
This guide 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 approved Jan. 1, 2014Sept. 1, 2017. Published January 2014September 2017. Originally approved in 2011. Last previous edition approved in 20112014
as C1756-11.-14. DOI: 10.1520/C1756-14.10.1520/C1756-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1756 − 17
adhesion failure, n—in building construction, failure of the bond between a
sealant and a substrate.
Discussion—This definition pertains to interfacial adhesion failure, a lack of
bond at the interface between the materials. Interphasal adhesion failure, within
the sealant or substrate near the interface, is less common and may appear to be
cohesive failure, n—in building construction, failure characterized by rupture
interfacial without the use of magnification.
within the sealant.
FIG. 1 Adhesion Failure
FIG. 3 Cohesive Failure
chalking, v—in building construction, formation of a powder on the surface of a
crazed, adj—in building construction, having a random network of cracks in a
sealant that is caused by the disintegration of the polymer or binding medium due
sealant surface which do not penetrate through the body of the material.
to weathering.
FIG. 4 Crazed
FIG. 2 Chalking
2

---------------------- Page: 2 ----------------------
C1756 − 17
dirt pick-up, n—in bu
...