ASTM C771-14(2019)

Standard Test Method for Weight Loss After Heat Aging of Preformed Tape Sealants

SIGNIFICANCE AND USE
5.1 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 C681 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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.

General Information

• Status: Published
• Publication Date: 30-Apr-2019
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.20 - General Test Methods

Relations

• Replaces: ASTM C771-14 - Standard Test Method for Weight Loss After Heat Aging of Preformed Tape Sealants
• Effective Date: 01-May-2019
• Refers: ASTM C681-14(2019) - Standard Test Method for Volatility of Oil- and Resin-Based, Knife-Grade, Channel Glazing Compounds
• Effective Date: 01-May-2019
• Refers: ASTM E145-19 - Standard Specification for Gravity-Convection and Forced-Ventilation Ovens
• Effective Date: 01-Mar-2019
• Refers: ASTM C717-19 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Mar-2019
• Refers: ASTM C717-18 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Mar-2018
• Refers: ASTM C717-17a - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Nov-2017
• Refers: ASTM C717-17 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Jan-2017
• Refers: ASTM C717-16a - Standard Terminology of Building Seals and Sealants
• Effective Date: 15-Nov-2016
• Refers: ASTM C717-16 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Sep-2016
• Refers: ASTM C717-14a - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-May-2014
• Refers: ASTM C717-14 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Feb-2014
• Refers: ASTM C681-14 - Standard Test Method for Volatility of Oil- and Resin-Based, Knife-Grade, Channel Glazing Compounds
• Effective Date: 01-Jan-2014
• Refers: ASTM C717-13 - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Nov-2013
• Refers: ASTM C717-12b - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-Dec-2012
• Refers: ASTM C717-12a - Standard Terminology of Building Seals and Sealants
• Effective Date: 01-May-2012

Overview

ASTM C771-14(2019) specifies a standardized laboratory method for determining the weight loss after heat aging of preformed tape sealants. Preformed tape sealants are tacky, deformable solids that act as sealing materials between substrates, often used where long-lasting, minimal volatility is critical. This standard is widely recognized for evaluating the durability and performance of sealing tapes exposed to elevated temperatures, ensuring industry materials meet stringent quality benchmarks.

Key Topics

• Purpose: The test method measures the weight loss of preformed tape sealants after a controlled period of heat exposure, simulating long-term aging conditions.
• Significance: Preformed tape sealants are formulated to be nearly 100% solids, distinguishing them from other products like gunnable sealants and caulks. Minimal weight loss is vital for maintaining their sealing performance over time.
• Scope of Standard:
  • Applies to factory-produced, preformed tape sealants.
  • Evaluates volatility and material stability under heat.
  • Utilizes metric units as the standard of measurement.
• Test Summary:
  • Samples of preformed tape seals are prepared, weighed, and subjected to a set elevated temperature for one week.
  • After conditioning, the samples are cooled and reweighed.
  • Weight loss is calculated and reported as a percentage, indicating potential volatility and long-term performance.
• Precision: Proven repeatability within specified tolerances based on interlaboratory studies.

Applications

ASTM C771 is essential in quality control, product development, and specification for a wide range of industries, including:

• Building and Construction: Ensures preformed tape sealants used in glazing, curtain walls, and panel assemblies retain their properties after prolonged exposure to elevated temperatures.
• Manufacturing Quality Assurance: Assists manufacturers in benchmarking their products against industry standards and in fulfilling customer requirements for durability.
• Research and Development: Provides critical data on the stability and aging characteristics of new or modified tape sealant formulations.
• Purchase Specifications: Engineering firms, contractors, and procurement teams rely on ASTM C771-compliant data to select suitable products for long-term sealing applications.

Selecting materials with low weight loss after heat aging helps guarantee reliable seals, reducing maintenance, improving safety, and meeting regulatory demands in critical installations.

Related Standards

For comprehensive testing and specification of sealant performance, consider these related ASTM standards:

• ASTM C681 - Standard Test Method for Volatility of Oil- and Resin-Based, Knife-Grade, Channel Glazing Compounds
• ASTM C717 - Terminology of Building Seals and Sealants
• ASTM E145 - Specification for Gravity-Convection and Forced-Ventilation Ovens (utilized in the heat aging process)

While ASTM C771-14(2019) is unique in its focus-there is currently no directly equivalent ISO standard-referencing it alongside these related documents supports a robust materials assessment regime.

Keywords: preformed tape sealants, weight loss after heat aging, ASTM C771, sealing tapes, volatility test, durability of sealants, laboratory procedure

For manufacturers, specifiers, and testing laboratories, ASTM C771-14(2019) provides a reliable, internationally recognized method for ensuring the longevity and stability of preformed tape sealants in demanding environments.

Standards Content (Sample)

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: C771 − 14 (Reapproved 2019)
Standard Test Method for
Weight Loss After Heat Aging of Preformed Tape Sealants
This standard is issued under the fixed designation C771; 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 4. Summary of Test Method
1.1 This test method covers a laboratory procedure for 4.1 The preformed tape sealant to be tested is placed on a
determining the weight loss after heat aging of preformed tape tared metal plate and weighed. After heat aging, the specimen
sealants. is weighed again. The difference in weight indicates the
volatile content of the tape sealant.
NOTE 1—Test Method C681 describes a weight loss or volatility test for
knife-grade glazing compounds.
5. Significance and Use
1.2 The values stated in acceptable metric units are to be
5.1 Preformed tape sealants are tacky, deformable solids
regarded as the standard. The values given in parentheses are
that are used under compression between two substrates in a
for information only.
variety of sealing applications. Compared to other types of
1.3 The subcommittee with jurisdiction is not aware of any
sealants, that is, gunnable sealants and caulks, sealing tapes are
similar ISO standard.
designed to be essentially 100 % solids materials. In use, these
tapes are intended to give long service with minimal weight
1.4 This standard does not purport to address all of the
loss or volatility. This procedure will give a measure of the
safety concerns, if any, associated with its use. It is the
weight loss of a preformed tape sealant after a controlled
responsibility of the user of this standard to establish appro-
period of exposure at an elevated temperature.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
6. Apparatus
1.5 This international standard was developed in accor-
6.1 Balance, calibrated to weigh specimens to the nearest
dance with internationally recognized principles on standard-
0.01 g.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
6.2 Thin Plates of Aluminum or Other Metal, two, not less
mendations issued by the World Trade Organization Technical
than 51 mm (2 in.) wide by 152 mm (6 in.) long, for each tape
Barriers to Trade (TBT) Committee.
to be tested.
2. Referenced Documents 6.3 Vented Air Circulating Oven, that complies with Speci-
2 fication E145 and is capable of aging samples at 100 6 2°C
2.1 ASTM Standards:
(212 6 3.6°F).
C681 Test Method for Volatility of Oil- and Resin-Based,
Knife-Grade, Channel Glazing Compounds
7. Sampling
C717 Terminology of Building Seals and Sealants
7.1 Use a fresh roll of preformed tape sealant for testing.
E145 Specification for Gravity-Convection and Forced-
Remove a section of preformed tape sealant approximately 61
Ventilation Ovens
cm (2 ft) long from the roll and discard.
3. Terminology
7.2 Remove release paper as required in order to fashion a
3.1 Definitions—For definitions of terms used in this test
suitable test specimen.
method, see Terminology C717.
8. Procedure
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
8.1 For each preformed tape sealant to be tested, prepare
Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on
two test specimens as follows:
General Test Methods.
8.1.1 Clean and dry two metal plates, weigh them, and
Current edition approved May 1, 2019. Published May 2019. Originally
record the tare weight for each to the nearest 0.01 g.
approved in 1974. Last previous ed
...