ASTM C765-97(2011)

Standard Test Method for Low-Temperature Flexibility of Preformed Tape Sealants

SIGNIFICANCE AND USE
Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. This procedure is not intended to simulate an actual use condition, but it will give some indication of the flexibility and adhesion of a tape at low temperature. It can serve to differentiate between flexible tapes that can take some movement and those that tend to harden or embrittle on aging and crack or lose adhesion when flexed at low temperature. It will also aid in identifying sealants that have poor flexibility because they are overextended and contain a low level of binder as well as those sealants having binders that will embrittle at low temperature.
SCOPE
1.1 This test method covers a laboratory procedure for testing the low-temperature flexibility of preformed tape sealants.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.3 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 health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Nov-2011
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.20 - General Test Methods

Relations

• Replaces: ASTM C765-97(2007) - Standard Test Method for Low-Temperature Flexibility of Preformed Tape Sealants
• Effective Date: 01-Dec-2011
• Referred By: ASTM C1281-16(2023) - Standard Specification for Preformed Tape Sealants for Glazing Applications
• Effective Date: 01-Dec-2011
• Referred By: ASTM E1637-98(2017)e1 - Standard Specification for Structural Standing Seam Aluminum Roof Panel Systems
• Effective Date: 01-Dec-2011
• Referred By: ASTM E1514-98(2017)e1 - Standard Specification for Structural Standing Seam Steel Roof Panel Systems
• Effective Date: 01-Dec-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C765 − 97(Reapproved 2011)
Standard Test Method for
Low-Temperature Flexibility of Preformed Tape Sealants
This standard is issued under the fixed designation C765; 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 to simulate an actual use condition, but it will give some
indication of the flexibility and adhesion of a tape at low
1.1 This test method covers a laboratory procedure for
temperature. It can serve to differentiate between flexible tapes
testing the low-temperature flexibility of preformed tape seal-
that can take some movement and those that tend to harden or
ants.
embrittle on aging and crack or lose adhesion when flexed at
1.2 The values stated in SI units are to be regarded as the
low temperature. It will also aid in identifying sealants that
standard. The values in parentheses are for information only.
have poor flexibility because they are overextended and
1.3 This standard does not purport to address all of the contain a low level of binder as well as those sealants having
safety concerns, if any, associated with its use. It is the
binders that will embrittle at low temperature.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
6. Apparatus
bility of regulatory limitations prior to use.
6.1 Freezer Unit, capable of maintaining a temperature of
−23 6 2°C (−10 6 3.6°F).
2. Referenced Documents
6.2 Aluminum Panel(unpolished),approximately0.635mm
2.1 ASTM Standards:
(0.025 in.) thick, 76 mm (3 in.) wide, and 152 mm (6 in.) long.
C717 Terminology of Building Seals and Sealants
E145 Specification for Gravity-Convection and Forced-
6.3 Steel Mandrel, 25.4 mm (1 in.) in diameter, with
Ventilation Ovens
supporting holder or rack.
6.4 Vented Air Circulating Oven, that complies with Speci-
3. Terminology
ficationE145andiscapableofmaintainingatemperatureof70
3.1 Definitions—Thedefinitionsofthefollowingtermsused
6 2°C (158 6 3.6°F).
in this test method are found in Terminology C717: preformed
tape sealant, sealant.
7. Sampling
4. Summary of Test Method
7.1 Samples to be tested shall be taken from a fresh roll of
tape sealant after first removing and discarding approximately
4.1 The preformed tape sealant to be tested is applied to an
the first 0.61 m (2 ft) of the roll.
aluminum panel. The assembly is heat aged, then placed in the
freezer where the panel is quickly bent over a mandrel. The
8. Test Specimen
specimen is examined for cracking and loss of adhesion.
8.1 Prepare the test specimen as follows:
5. Significance and Use
8.1.1 Clean the 76-mm by 152-mm (3-in. by 6-in.) alumi-
5.1 Preformed tape sealants are tacky, deformable solids
num panel with methyl ethyl ketone or similar solvent.
that are used under compression between two substrates in a
8.1.2 Place a 102-mm (4-in.) length of tape in the center of
variety of sealing applications. This procedure is not intended
the panel with its length paralleling that of the panel, leaving
the release paper in place on the preformed tape sealant.
8.1.3 Apply light finger pressure to ensure intimate contact
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
of the preformed tape sealant with the panel.
Seals and Sealants and is the direct responsibility of Subcommittee C24.20
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