ASTM C1521-09e1
(Practice)Standard Practice for Evaluating Adhesion of Installed Weatherproofing Sealant Joints
Standard Practice for Evaluating Adhesion of Installed Weatherproofing Sealant Joints
SIGNIFICANCE AND USE
Many parameters contribute to the overall performance of a sealant application. Some of the most significant parameters are sealant bead size and configuration, joint movement, quality of workmanship, the quality of the adhesive bond, and the quality of the sealant material.
A sealant usually fails to perform as a weatherseal when it experiences cohesive or adhesive failure.
If a sealant bead fails, an evaluation of the total joint movement may be needed to determine if the joint sealant was strained beyond design or if the sealant failed within design parameters.
If a sealant bead fails adhesively, there is no straightforward procedure for determining the cause. The adhesive failure may be due to workmanship, the specific surface preparation used, the specific sealant used, poor “installed” joint design, poor bond chemistry and other causes.
Because of the complex nature of the performance of a sealant bead, an understanding of the quality of the adhesive bond is instrumental in any evaluation of sealant performance. It is critical that the test procedures used truly evaluate the quality of the adhesive bond and do not simply take advantage of the tear resistance of the sealant.
This method does not evaluate the performance of a sealant joint as a weatherseal. It only evaluates the characteristics of the adhesive bond relative to the cohesive strength of the sealant in a particular installation. Since any failures that result from use of this test method are intentionally induced, they do not necessarily mean that the sealant joint will not perform as a weatherseal.
The results of these methods are most useful in identifying sealant joints with poor adhesion. The continuous inspection procedure is also useful in the identification of places of poor joint configuration. Obvious cohesive failures are also identified. The results of these methods can be used to assess the likely performance of the sealant joint and to compare performance against other seal...
SCOPE
1.1 This practice describes destructive and nondestructive procedures.
1.2 The destructive procedure stresses the sealant in such a way as to cause either cohesive or adhesive failure of the sealant or cohesive failure of the substrate where deficient substrate conditions exist. The objective is to characterize the adhesive/cohesive performance of the sealant on the specific substrate by applying whatever strain is necessary to effect failure of the sealant bead. It is possible that the strain applied to the sealant bead may result in the failure of a deficient substrate before effecting a failure in the sealant.
Note 1—The destructive procedure requires immediate repair of the sealant bead. Appropriate materials and equipment should be available for this purpose.
Note 2—Sealant formulations may fail in cohesion or adhesion when properly installed, and tested by this method. The sealant manufacturer should be consulted to determine the appropriate guidelines for using this method.
1.3 The nondestructive procedure places strain on the sealant and a stress on the adhesive bond. Though termed nondestructive, this procedure may result in an adhesive failure of a deficient sealant bead, but should not cause a cohesive failure in the sealant. The results of this procedure should be either adhesive failure or no failure.
Note 3—The nondestructive procedure may require immediate repair of the sealant bead, if failure is experienced. Appropriate materials and equipment should be available for this purpose.
1.4 The non-destructive procedure can be used for continuous inspection of 100 % of the joint(s) or for any areas where deficient conditions, which are inconsistent with the practices of Guide C1193, are suspected.
1.5 The committee with jurisdiction over this practice is not aware of any comparable practices published by other organizations or committees.
1.6 The values stated in inch-pound units are to be r...
General Information
Relations
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
´1
Designation:C1521 −09
StandardPractice for
Evaluating Adhesion of Installed Weatherproofing Sealant
1
Joints
This standard is issued under the fixed designation C1521; 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
´ NOTE—Editorial changes were made in Section 7 in December 2009.
1. Scope 1.6 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
1.1 This practice describes destructive and nondestructive
conversions to SI units that are provided for information only
procedures.
and are not considered standard.
1.2 The destructive procedure stresses the sealant in such a
1.7 This standard does not purport to address all of the
way as to cause either cohesive or adhesive failure of the
safety concerns, if any, associated with its use. It is the
sealant or cohesive failure of the substrate where deficient
responsibility of the user of this standard to establish appro-
substrate conditions exist. The objective is to characterize the
priate safety and health practices and determine the applica-
adhesive/cohesive performance of the sealant on the specific
bility of regulatory limitations prior to use.
substrate by applying whatever strain is necessary to effect
failure of the sealant bead. It is possible that the strain applied
2. Referenced Documents
to the sealant bead may result in the failure of a deficient
2
2.1 ASTM Standards:
substrate before effecting a failure in the sealant.
C717 Terminology of Building Seals and Sealants
NOTE 1—The destructive procedure requires immediate repair of the
sealant bead.Appropriate materials and equipment should be available for
C1193 Guide for Use of Joint Sealants
this purpose.
NOTE 2—Sealant formulations may fail in cohesion or adhesion when
3. Terminology
properly installed, and tested by this method. The sealant manufacturer
should be consulted to determine the appropriate guidelines for using this
3.1 Definitions—For definitions of terms used in this rec-
method.
ommended procedure, see Terminology C717.
1.3 The nondestructive procedure places strain on the seal-
3.2 Definitions of Terms Specific to This Standard:
ant and a stress on the adhesive bond. Though termed
3.2.1 flap, n—the term “flap” as used in this specification
nondestructive,thisproceduremayresultinanadhesivefailure
refers to a portion of an installed sealant bead that has been
of a deficient sealant bead, but should not cause a cohesive
purposelycutalongonesubstratebondlineandacrossthebead
failure in the sealant. The results of this procedure should be
at two locations resulting in a portion of bead adhered along
either adhesive failure or no failure.
one substrate bond line.
NOTE 3—The nondestructive procedure may require immediate repair
3.2.2 tail, n—the term “tail” as used in this specification
of the sealant bead, if failure is experienced. Appropriate materials and
equipment should be available for this purpose. refers to a portion of an installed sealant bead that has been
purposely cut along both substrate bond lines and across the
1.4 The non-destructive procedure can be used for continu-
bead at one location resulting in a portion of bead unadhered to
ous inspection of 100 % of the joint(s) or for any areas where
the substrates but adhered to the remainder of the sealant bead.
deficient conditions, which are inconsistent with the practices
of Guide C1193, are suspected.
4. Significance and Use
1.5 The committee with jurisdiction over this practice is not
4.1 Many parameters contribute to the overall performance
aware of any comparable practices published by other organi-
of a sealant application. Some of the most significant param-
zations or committees.
eters are sealant bead size and configuration, joint movement,
1
This practice is under the jurisdiction of ASTM Committee C24 on Building
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on
2
Adhesion. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 2002. Last previous edition approved in 2008 as C1521 – 08a. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
C1521-09. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
´1
C1521−09
quality of workmanship, the quality of the adhesive bond, and surface of th
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.