ASTM C771-03

Standard Test Method for Weight Loss After Heat Aging of Preformed Sealing Tapes

SIGNIFICANCE AND USE
Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. Compared to other types of sealants, that is, gunnable sealants and caulks, sealing tapes are designed to be essentially 100 % solids materials. In use, these tapes are intended to give long service with minimal weight loss or volatility. This procedure will give a measure of the weight loss of a preformed tape sealant after a controlled period of exposure at an elevated temperature.
SCOPE
1.1 This test method covers a laboratory procedure for determining the weight loss after heat aging of preformed tape sealants.
Note 1—Test Method C 681 describes a weight loss or volatility test for knife-grade glazing compounds.
1.2 The values stated in acceptable metric units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The subcommittee with jurisdiction is not aware of any similar ISO standard.
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 health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-2003
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.20 - General Test Methods

Relations

• Replaces: ASTM C771-97 - Standard Test Method for Weight Loss After Heat Aging of Preformed Sealing Tapes
• Effective Date: 10-May-2003
• Replaced By: ASTM C771-03(2009) - Standard Test Method for Weight Loss After Heat Aging of Preformed Sealing Tapes
• Effective Date: 01-Jan-2009
• Referred By: ASTM C1281-16(2023) - Standard Specification for Preformed Tape Sealants for Glazing Applications
• Effective Date: 10-May-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C771–03
Standard Test Method for
1
Weight Loss After Heat Aging of Preformed Tape Sealants
This standard is issued under the fixed designation C 771; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
1.1 This test method covers a laboratory procedure for 5.1 Preformed tape sealants are tacky, deformable solids
determining the weight loss after heat aging of preformed tape that are used under compression between two substrates in a
sealants. variety of sealing applications. Compared to other types of
sealants, that is, gunnable sealants and caulks, sealing tapes are
NOTE 1—Test Method C 681 describes a weight loss or volatility test
designed to be essentially 100 % solids materials. In use, these
for knife-grade glazing compounds.
tapes are intended to give long service with minimal weight
1.2 The values stated in acceptable metric units are to be
loss or volatility. This procedure will give a measure of the
regarded as the standard. The values given in parentheses are
weight loss of a preformed tape sealant after a controlled
for information only.
period of exposure at an elevated temperature.
1.3 The subcommittee with jurisdiction is not aware of any
similar ISO standard.
6. Apparatus
1.4 This standard does not purport to address all of the
6.1 Balance, calibrated to weigh specimens to the nearest
safety concerns, if any, associated with its use. It is the
0.01 g.
responsibility of the user of this standard to establish appro-
6.2 Thin Plates of Aluminum or Other Metal, two, not less
priate safety and health practices and determine the applica-
than 51 mm (2 in.) wide by 152 mm (6 in.) long, for each tape
bility of regulatory limitations prior to use.
to be tested.
6.3 Vented Air Circulating Oven, that complies with Speci-
2. Referenced Documents
fication E 145 and is capable of aging samples at 100 6 2°C
2.1 ASTM Standards:
(212 6 3.6°F).
C 681 Test Method for Volatility of Oil- and Resin-Based,
2
Knife-Grade, Channel Glazing Compounds
7. Sampling
2
C 717 Terminology of Building Seals and Sealants
7.1 Use a fresh roll of preformed tape sealant for testing.
E 145 Specification for Gravity-Convection and Forced-
Remove a section of preformed tape sealant approximately 61
3
Ventilation Ovens
cm (2 ft) long from the roll and discard.
7.2 Remove release paper as required in order to fashion a
3. Terminology
suitable test specimen.
3.1 Definitions—Thedefinitionsofthefollowingtermsused
in this test method are found inTerminology C 717: preformed
8. Procedure
tape sealant, sealant.
8.1 For each preformed tape sealant to be tested, prepare
two test specimens as follows:
4. Summary of Test Method
8.1.1 Clean and dry two metal plates, weight them, and
4.1 The preformed tape sealant to be tested is placed on a
record the tare weight for each to the nearest 0.01 g.
tared metal plate and weighed. After heat aging, the specimen
8.1.2 Cut the preformed tape sealant into 127-mm (5.0-in.)
is weighed again. The difference in weight indicates the
lengths. Ply strips together to form on each specimen plate a
volatile content of the tape sealant.
solid block of preformed tape sealant not less than 38 mm (1.5
in.) wide by 3 mm (0.12 in.) thick by 127 mm (5.0 in.) long.
1
8.1.3 Weight the plates with the preformed tape sealant on
Thistestmetho
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