ASTM C1266-17(2024)

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.
Designation: C1266 − 17 (Reapproved 2024)
Standard Test Method for
Flow Characteristics of Preformed Tape Sealants
This standard is issued under the fixed designation C1266; 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 aluminum plates, which are then compressed. A standard
weight is placed on the test assembly for 1 h at room
1.1 This test method describes a laboratory procedure for
temperature. The height of the test assembly is measured to
determining the flow characteristics of preformed tape sealants
determine the rebound of the sample. The test assembly is then
after a specified time, temperature, and load.
placed in an 88 °C (190 °F) oven with the standard weight on
1.2 The values stated in SI units are to be regarded as the
it. After 24 h the height of the test assembly is measured again
standard. The inch-pound units given in parentheses are
to determine the flow of the sample.
provided for information purposes only.
1.3 The committee with jurisdiction of this specification is
5. Significance and Use
not aware of any similar specification within ISO or any other
5.1 Tape sealants are tacky, deformable solids, which are
organization.
used under compression between two or more surfaces of
1.4 This standard does not purport to address all of the
similar or dissimilar substrates in a variety of sealing applica-
safety concerns, if any, associated with its use. It is the
tions. These tapes are normally supplied in a roll form with a
responsibility of the user of this standard to establish appro-
release paper interlever and are hand pressed against a fixed
priate safety, health, and environmental practices and deter-
substrate. This procedure is designed to give an indication of
mine the applicability of regulatory limitations prior to use.
the flow characteristics of a tape sealant under controlled
1.5 This international standard was developed in accor-
temperature and aging conditions with a specified load.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Apparatus
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6.1 Aluminum Plates, four, each 6.35 mm by 76.2 mm by
Barriers to Trade (TBT) Committee.
101.6 mm (0.25 by 3.00 by 4.00 in.).
2. Referenced Documents
6.2 Lead Weights, two, each 3.63 kg (8.0 lb) with dimen-
sions large enough to cover the entire assembly, but not
2.1 ASTM Standards:
overhanging the assembly.
C717 Terminology of Building Seals and Sealants
6.3 Mechanical Convection Oven, capable of maintaining a
3. Terminology
temperature of 88 °C 6 1 °C (190 °F 6 2 °F).
3.1 Definitions—The definitions of the following terms used
6.4 Steel Spacers, six, each 76.2 mm by 5.08 mm by
in this test method are found in Terminology C717: compound,
5.08 mm 6 0.05 mm (3.00 by 0.20 by 0.20 6 0.002 in.).
seal, sealant, standard conditions, substrate and tape sealant.
6.5 Thickness Gage, having a total capacity of at least
4. Summary of Test Method
76.2 mm (3.00 in.) graduated in 0.025 mm (0.001 in.) divi-
4.1 The tape sealant to be tested is rolled into spherical balls
sions. The gage shall be equipped to provide a 57 g (2 oz) load
of equal weight. Four spherical balls are placed between two
over a minimum contact area of 6.35 mm (0.25 in.).
This test method is under the jurisdiction of ASTM Committee C24 on Building 6.6 Laboratory Press, at room temperature, to compress the
Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on
preformed sealant tape to the proper material thickness.
General Test Methods.
Current edition approved Jan. 1, 2024. Published January 2024. Originally
6.7 Stop Watch, to measure the timed intervals specified in
approved in 1995. Last previous edition approved in 2017 as C1266–17. DOI:
the laboratory procedure.
10.1520/C1266-17R24.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.8 Laboratory Precision Balance (capable of weighing to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
0.1 mg) to measure the weight of the individual spherical balls
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. of tape.
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C1266 − 17 (2024)
7. Sampling 8.1.1.8 Center the assembly on the base plate of the lab
press at room temperature and compress firmly to the spacer
7.1 Samples to be tested shall be taken from a fresh roll of
bars, until the spacer bars cannot be moved by hand. Maintain
tape sealant taken directly from a randomly selected commer-
this compression mode for 1 min. At the end of 1 min raise the
cial container as supplied by the manufacturer, after first
press and remove the assembly taking care not to disturb it.
removing and discarding approximately the first 0.61 (2 ft) of
Carefully remove the spacer bars (see Fig. 3).
the roll.
8. Test Assembly Preparation
9. Conditioning
8.1 A total of two assemblies per tape are to be prepared.
9.1 Condition the test assemblies at standard conditions for
8.1.1 Prepare a test assembly as follows:
1 h.
8.1.1.1 Clean two aluminum plates with isopropy
...