ASTM C1087-23

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Designation: C1087 − 16 C1087 − 23
Standard Test Method for
Determining Compatibility of Liquid-Applied Sealants with
Accessories Used in Structural Glazing Systems
This standard is issued under the fixed designation C1087; 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 covers a laboratory screening procedure for determining the compatibility of liquid-applied structural sealant
glazing sealants when in contact with accessories such as dry glazing gaskets, spacers, shims, and setting blocks after exposure
to heat and ultraviolet light.
1.2 This test method includes the observation of three parameters as follows:
1.2.1 Changes in the color of the sealant,
1.2.2 Changes in the adhesion of the sealant to glass, and
1.2.3 Changes in the adhesion of the sealant to the accessory being tested.
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 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 and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
NOTE 1—At this time, no comparable ISO standard exists.
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
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
3. Terminology
3.1 Definitions—Definitions of the following terms used in this test method are listed in Terminology C717: adhesive failure
(adhesion loss), bead, bond breaker, cohesive failure, compatibility, gasket, glazing, sealant, setting blocks, shim, spacer, structural
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on General
Test Methods.
Current edition approved June 1, 2016May 1, 2023. Published July 2016May 2023. Originally approved in 1987. Last previous edition approved in 20112016 as
C1087 – 00 (2011).C1087 – 16. DOI: 10.1520/C1087-16.10.1520/C1087-23.
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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C1087 − 23
sealant, standard conditions, and structural sealant glazing.
4. Summary of Test Method
4.1 The test specimens are placed beneath ultraviolet lamps so that the radiation will hit the sealant directly on one specimen, and
through the glass, on the other specimen (see Fig. 1).
4.2 The control specimens for this test method are prepared and tested identically to the test specimens except that the accessory
is eliminated.
4.3 After the specimens are exposed, the test specimens are compared to the control specimens.
4.4 In the testing of the specimens, any color change in the sealant between the test specimen and the control is noted as are any
changes in the adhesion of the sealant to either the glass or to the accessory. This test method requires the preparation of eight test
specimens (four controls and four test specimens for each accessory being evaluated).
5. Significance and Use
5.1 In structural sealant glazing systems, the sealant functions as the structural adhesive and may also function as the primary
weather seal. As the structural adhesive, the integrity of the adhesive bond is critical.
5.2 Changes in color and adhesion after exposure are two of the criteria that can be used to determine the compatibility of the
system. Experience has shown that accessories that cause loss of adhesion or discoloration in this test method may also cause these
occurrences in actual use.
6. Apparatus and Materials
6.1 Glass Panels, clear float glass, approximately 76.2 by 50.876.2 mm by 50.8 mm by 6.4 mm (3 by 2(3 in. by 2 in. by ⁄4 in.).
Eight panels are required for each material being tested.
6.2 Bond Breaker Tape, 25.4 by 76.2-mm (1 by 3-in.)25.4 mm by 76.2 mm (1 in. by 3 in.) piece for each panel. The bond breaker
tape must be compatible with the sealants being tested.
6.3 Thermometer, for example, 28.9 to 100°C (20 to 212°F).28.9 °C to 100 °C (20 °F to 212 °F).
6.4 Ultraviolet (UV) lamps, UVA-340 lamps.
6.5 UV Exposure Apparatus—A suitable UV exposure apparatus will consist of four UVA-340 lamps in a symmetrical array
situated 254 mm (12 in.) from the surface of the test specimens (see Fig. 3). The apparatus shall be capable of maintaining a
FIG. 1 Orientation of Test Specimen Under Lamps
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FIG. 2 View of Test Specimen
FIG. 3 UV Exposure Apparatus
FIG. 4 UV Lamp Rotation
temperature at the test specimens of 48 6 2°C (118 6 3.6°F).48 °C 6 2 °C (118 °F 6 3.6 °F). Infrared lamps or other sources
of heat may be used to maintain the required temperature.
6.6 Cleaning Solvent—Any solvent capable of cleaning the glass is acceptable (for example, 50/50 mix of isopropyl alcohol and
distilled water).
6.7 Test Sealant, an appropriate amount of the sealant to be used in the system.
6.8 Reference Sealant—A light or translucent sealant of the same composition as the test sealant. If none is available, contact the
sealant supplier for recommendations on a suitable alternative.
7. Preparation of Test Specimens
7.1 Precondition the unopened containers of sealant at standard conditions for a minimum of 24 h.
7.2 Prior to use, clean the glass thoroughly with the cleaning solvent and dry with a clean rag before the solvent is allowed to
evaporate.
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7.3 Place a piece of compatible bond breaker tape to cover 1 in. of the top surface of the glass at one end (see Fig. 2).
7.4 Prepare a total of eight samples (four controls without accessory and four test specimens with accessory). Cut a piece of
1 1
accessory material approximately 6.4 by 51 by 6.4 mm 6.4 mm by 51 mm by 6.4 mm ( ⁄4 in. by 22 in. by ⁄4 in.) and place it o
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