ASTM C765-97(2007)

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.
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: 31-May-2007
• 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(2001)e1 - Standard Test Method for Low-Temperature Flexibility of Preformed Tape Sealants
• Effective Date: 01-Jun-2007
• Replaced By: ASTM C765-97(2011) - Standard Test Method for Low-Temperature Flexibility of Preformed Tape Sealants
• 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-Jun-2007
• Referred By: ASTM C1281-16(2023) - Standard Specification for Preformed Tape Sealants for Glazing Applications
• Effective Date: 01-Jun-2007
• Referred By: ASTM E1514-98(2017)e1 - Standard Specification for Structural Standing Seam Steel Roof Panel Systems
• Effective Date: 01-Jun-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2007)
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope temperature. It can serve to differentiate between flexible tapes
that can take some movement and those that tend to harden or
1.1 This test method covers a laboratory procedure for
embrittle on aging and crack or lose adhesion when flexed at
testing the low-temperature flexibility of preformed tape seal-
low temperature. It will also aid in identifying sealants that
ants.
have poor flexibility because they are overextended and
1.2 The values stated in SI units are to be regarded as the
contain a low level of binder as well as those sealants having
standard. The values in parentheses are for information only.
binders that will embrittle at low temperature.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 Freezer Unit, capable of maintaining a temperature
priate safety and health practices and determine the applica-
of−23 6 2°C (−10 6 3.6°F).
bility of regulatory limitations prior to use.
6.2 Aluminum Panel (unpolished), approximately 0.635
2. Referenced Documents mm (0.025 in.) thick, 76 mm (3 in.) wide, and 152 mm (6 in.)
long.
2.1 ASTM Standards:
6.3 Steel Mandrel, 25.4 mm (1 in.) in diameter, with
C717 Terminology of Building Seals and Sealants
supporting holder or rack.
E145 Specification for Gravity-Convection and Forced-
6.4 Vented Air Circulating Oven, that complies with Speci-
Ventilation Ovens
ficationE145andiscapableofmaintainingatemperatureof70
3. Terminology 6 2°C (158 6 3.6°F).
3.1 Definitions—Thedefinitionsofthefollowingtermsused
7. Sampling
in this test method are found in Terminology C717: preformed
7.1 Samples to be tested shall be taken from a fresh roll of
tape sealant, sealant.
tape sealant after first removing and discarding approximately
4. Summary of Test Method the first 0.61 m (2 ft) of the roll.
4.1 The preformed tape sealant to be tested is applied to an
8. Test Specimen
aluminum panel.The assembly is heat aged, then placed in the
8.1 Prepare the test specimen as follows:
freezer where the panel is quickly bent over a mandrel. The
8.1.1 Clean the 76-mm by 152-mm (3-in by 6-in.) alumi-
specimen is examined for cracking and loss of adhesion.
num panel with methyl ethyl ketone or similar solvent.
5. Significance and Use
8.1.2 Place a 102-mm (4-in.) length of tape in the center of
the panel with its length paralleling that of the panel, leaving
5.1 Preformed tape sealants are tacky, deformable solids
the release paper in place on the preformed tape sealant.
that are used under compression between two substrates in a
8.1.3 Apply light finger pressure to ensure intimate contact
variety of sealing applications. This procedure is not intended
of the preformed tape sealant with the panel.
to simulate an actual use condition, but it will give some
8.1.4 Remove the release paper from the test specimen.
indication of the flexibility and adhesion of a tape at low
9. Conditioning
Thistes
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