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), Standard Test Method for Weight Loss After Heat Aging of Preformed Tape Sealants, establishes a laboratory procedure to determine the weight loss of preformed tape sealants after exposure to elevated temperatures. Preformed tape sealants are tacky, deformable solids used in compression between substrates for sealing applications. Unlike gunnable or caulk sealants, these tapes are designed to be essentially 100% solids, ensuring long-term service with minimal volatility or weight loss.

This test method provides a practical approach for assessing the durability and performance of tape sealants under thermal stress by measuring the change in weight after a defined heating period.

Key Topics

• Purpose and Significance

  • Evaluates the weight loss of preformed tape sealants after heat aging.
  • Helps determine the long-term performance, stability, and service life of the sealant.
  • Useful for comparing products and qualifying material for specific sealing applications.

• Test Method Outline

  • A preformed tape sealant specimen is weighed on a tared metal plate.
  • The specimen is then exposed to a controlled environment in a ventilated oven at a specified elevated temperature for a set period (typically one week).
  • After cooling, the specimen is reweighed and the weight loss is calculated as an indicator of the sealant’s volatility.

• Importance of Minimal Weight Loss

  • Low weight loss signifies minimal volatiles, ensuring the sealant maintains its integrity and sealing effectiveness over time.
  • Excessive weight loss may indicate poor performance under thermal exposure, affecting reliability in construction or industrial settings.

Applications

• Construction Industry

  • Quality control and product evaluation for preformed tape sealants used in glazing, window sealing, curtain wall assemblies, and façade systems.
  • Selection of sealants for use in environments subject to heat, ensuring longevity and material compatibility.

• Manufacturing

  • Verification of tape sealant formulations to meet industry specifications.
  • Batch testing for consistency and compliance with performance criteria before distribution.

• Research and Development

  • Comparative testing of new or modified formulations for improved heat resistance and durability.
  • Supporting claims of product performance in marketing and certification.

• Regulatory and Quality Assurance

  • Third-party compliance testing to meet customer requirements or regulatory guidelines.
  • Providing objective data in product datasheets and technical literature.

Related Standards

• ASTM C681: Test Method for Volatility of Oil- and Resin-Based, Knife-Grade, Channel Glazing Compounds - offers a similar approach for different sealant types.
• ASTM C717: Terminology of Building Seals and Sealants - provides definitions relevant to this standard.
• ASTM E145: Specification for Gravity-Convection and Forced-Ventilation Ovens - outlines oven requirements for laboratory testing.

There is currently no directly equivalent ISO standard for this specific test method. Users should always verify the appropriateness of this standard for their particular application and consult referenced standards for complementary testing protocols or terminology.

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By following ASTM C771-14(2019), manufacturers, specifiers, and quality assurance professionals can ensure that preformed tape sealants meet demanding performance expectations, particularly regarding stability and longevity after heat exposure. This test method reinforces product reliability in critical sealing applications across building and industrial sectors.

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
...