ASTM C1635-22

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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: C1635 − 16 C1635 − 22
Standard Test Method to
Evaluate Adhesion/Cohesion Properties of a Sealant at
Fixed Extension
This standard is issued under the fixed designation C1635; 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 test method describes a laboratory procedure for measuring the adhesion/cohesion properties of a sealant when subjected
to tensile loads resulting from an applied specified strain. The adhesion/cohesion properties are evaluated before, during, and after
water immersion.
1.2 This test method examines the adhesive and cohesive performance of a sealant on a specified substrate at a strain equivalent
to a multiple of the strain/movement capability (Class in accordance with Specification C920) designated by the manufacturer for
the given sealant per in accordance with Specification C920.
1.3 The values stated in SI (metric) units are to be regarded as the standard. The inch values given in parentheses are for
information only.after SI units are provided for information only and are not considered standard.
1.4 Comparable Tests—Other comparable tests are ISO 10590 and 8340.
1.5 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 Comparable Test:
1.5.1 ISO 10590, Building construction - Jointing products - Sealants - Determination of adhesion/cohesion properties at
maintained extension after immersion in water
1.5.2 ISO 8340, Building construction - Jointing products - Sealants - Determination of tensile properties at maintained extension
1.6 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
2.1 ASTM Standards:
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on Adhesion
Current edition approved June 1, 2016June 1, 2022. Published July 2016July 2022. Originally approved in 2006. Last previous edition approved in 20142016 as
C1635-14.-16. DOI: 10.1520/C1635-16.10.1520/C1635-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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C1635 − 22
C717 Terminology of Building Seals and Sealants
C719 Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
C920 Specification for Elastomeric Joint Sealants
C1375 Guide for Substrates Used in Testing Building Seals and Sealants
2.2 ISO Standards:
ISO 8340 Building construction — Sealants — Determination of tensile properties at maintained extension
ISO 10590 Building construction — Sealants — Determination of tensile properties of sealants at maintained extension after
immersion in water
3. Terminology
3.1 Definitions—Refer to Terminology C717 for definitions of terms used in this standard, including but not limited to the
following: adhesive failure, casting spacers, cohesive failure, standard conditions.
3.2 separators—the device or item used to maintain the specimens at fixed extension.
4. Summary of Test Method
4.1 Test specimens made in accordance with dimensions set forth in Test Method C719 are fabricated and allowed to cure.
4.2 Test specimens are extended at standard conditions as defined in Terminology C717 to a specified strain and blocked at the
strain for a specified period of time.
4.3 The test specimens are examined for adhesive or cohesive failure, or both, of the sealant at 0, 24 and 168 h.
4.4 A duplicate set of three test specimens are cured at standard conditions as defined in Terminology C717, extended to a specified
strain, and then immersed (totally) in deionized water or specified medium (3 specimens/liter of liquid).
4.5 Immersed test specimens are observed at 0, 24 and 168 and other additional specified hours.
4.6 This test method uses ASTM standard substrates as described in Guide C1375. This test method does not exclude the use of
any other substrate that provides a suitable flat surface.
5. Significance and Use
5.1 In any sealant application, the sealant must be capable of maintaining an adhesive bond to the substrate when held in strain
for its intended service life.
5.2 This test method is an indicator of a sealant’s ability to adhere under strain to a given substrate.
TABLE 1 Suggested Strains for a 12.7-mm (0.50-in.) 12.7 mm (0.50 in.) Wide Sealant Joint.
Sealant Movement Distance between Distance between Distance between Distance between
RatingClass panelssubstrates panelssubstrates panelssubstrates panelssubstrates at
at 1× movement rating at 1.5× movement rating at 2× movement rating 4× movement rating
12.5 % 14.0 mm (0.55 in.) 14.7 mm (0.58 in.) 15.5 mm (0.61 in.) 19.0 mm (0.75 in.)
12.5 % 14.3 mm (0.56 in.) 14.5 mm (0.57 in.) 15.9 mm (0.63 in.) 19.0 mm (0.75 in.)
25 % 15.5 mm (0.61 in.) 17.2 mm (0.68 in.) 19.0 mm (0.75 in.) 25.4 mm (1 in.)
25 % 15.9 mm (0.63 in.) 17.5 mm (0.69 in.) 19.0 mm (0.75 in.) 25.4 mm (1 in.)
35 % 17 mm (0.67 in.) 19.4 mm (0.76 in.) 21.6 mm (0.85 in.) 30.5 mm (1.2 in.)
50 % 19.0 mm (0.75 in.) 21.8 mm (0.86 in.) 25.4 mm (1 in.) 38.1 mm (1.5 in.)
50 % 19.0 mm (0.75 in.) 22.2 mm (0.88 in.) 25.4 mm (1 in.) 38.1 mm (1.5 in.)
100 % 25.4 mm (1 in.) 31.8 mm (1.25 in.) 38.1 mm (1.5 in.) 63.5 mm (2.5 in.)
Available from International Organization for Standardization (ISO), ISO Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland,
https://www.iso.org.
C1635 − 22
5.3 The default test strain is the movement ability (Class in accordance with Specification C920) of the sealant as designated by
1 1
the manufacturer. The default joint configuration is 12.7 × 12.7 × mm by 12.7 mm by 50.8 mm ( ⁄2 × in. by ⁄2 × in. by 2 in.). Other
strains and joint configurations may be used and reported as noted in Section 8 and Table 1.
6. Apparatus and Materials
6.1 Container, for immersionimmersion; made of a material compatible with the immersion medium.
6.2 Device, to provide a strain on the test specimen.
6.3 Spatulas, for use in applying the sealant.
6.4 Caulking Gun, for extruding sealant from cartridges when applicable.
6.5 Substrates—Twelve substrates minimum of 25.4 × mm by 76.2 mm (1 × in. by 3 in.) of the same finish or type are required
for each test sample. Substrates must be of sufficient thickness or rigidity, or both, so as not to bend or distort under the imposed
strain.
6.6 Casting Spacers—Spacers, Mademade from polytetrafluoroethylene (PTFE) or a suitable rigid material shall be used with each
test specimen to which the test sealant will not bond and will provide the appropriate joint dimensions and configur
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