ASTM C1520-20

Standard Guide for Paintability of Latex Sealants

SIGNIFICANCE AND USE
5.1 The intent of this guide is to provide the reader with information concerning possible reasons for paint failures where the paint is used over a latex sealant.
SCOPE
1.1 This guide describes the practical considerations that may be used to determine the compatibility of a paint or coating to be applied over a latex sealant or caulk. It evaluates the appearance and not the performance characteristics of the coated or painted joint.  
1.2 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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-2020
• ICS: 87.040 - Paints and varnishes
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.10 - Specifications, Guides and Practices

Relations

• Referred By: ASTM C919-22 - Standard Practice for Use of Sealants in Acoustical Applications
• Effective Date: 01-May-2020

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: C1520 − 20
Standard Guide for
1
Paintability of Latex Sealants
This standard is issued under the fixed designation C1520; 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 3. Terminology
1.1 This guide describes the practical considerations that 3.1 Definitions—Refer to Terminology C717 for definitions
may be used to determine the compatibility of a paint or of the following term(s) used in this guide: compatibility, cure,
coating to be applied over a latex sealant or caulk. It evaluates joint, latex sealant. Refer to Terminology E284 for definitions
the appearance and not the performance characteristics of the of the following term(s) used in this guide: gloss.
coated or painted joint.
3.2 color change—a change in either the observed (see
Practice D1729) or measured color (see Practice D2244)ofa
1.2 Thecommitteewithjurisdictionoverthisstandardisnot
substance.
aware of any comparable standards published by other orga-
nizations.
3.3 cracking—a failure resulting in a discontinuous film (of
paint) or bead (of sealant).
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Summary of Practice
standard.
4.1 This guide reviews many of the issues concerning the
1.4 This standard does not purport to address all of the
compatibility of latex sealants with paint. While the focus of
safety concerns, if any, associated with its use. It is the
this guide is on latex sealants, the paint or coating may be of
responsibility of the user of this standard to establish appro-
any composition.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.5 This international standard was developed in accor-
5.1 The intent of this guide is to provide the reader with
dance with internationally recognized principles on standard-
information concerning possible reasons for paint failures
ization established in the Decision on Principles for the
where the paint is used over a latex sealant.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
CONSIDERATIONS
Barriers to Trade (TBT) Committee.
6. Temperature
2. Referenced Documents
6.1 Since standard testing is usually performed at “room
2
2.1 ASTM Standards:
temperature,” about 23°C, this would be considered the ideal
C717 Terminology of Building Seals and Sealants
temperature for application and curing. As the temperature
D1729 Practice for Visual Appraisal of Colors and Color
deviates from this ideal, the “science” of drying changes in that
Differences of Diffusely-Illuminated Opaque Materials
lower temperature results in slower drying and higher tempera-
D2244 Practice for Calculation of Color Tolerances and
ture results in faster drying.
Color Differences from Instrumentally Measured Color
Coordinates
7. Percent Relative Humidity
E284 Terminology of Appearance
7.1 In waterborne sealants, the humidity directly affects the
retained water in the material. Standard testing is typically
1
performed at 50 % RH, which allows for an acceptable water
ThisguideisunderthejurisdictionofASTMCommitteeC24onBuildingSeals
and Sealants and is the direct responsibility of Subcommittee C24.10 on
evaporation rate. Temperature and humidity variations in
Specifications, Guides and Practices.
climatic regions, and fluctuations occurring during the appli-
Current edition approved May 1, 2020. Published June 2020. Originally
ɛ1 cation and cure, will affect the cure and sealant performance.
approved in 2002. Last previous edition approved in 2015 as C1520-02(2015) .
DOI: 10.1520/C1520-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 8. Type of Paint
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
8.1 The type of paint applied to the sealant has an effect on
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. how well the paint may accommodate dimensional changes,
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1520 − 20
adhere to the sealant, or dry during the curing of the sealant. substrate will wick water or solvent and shorten the paint
Paints made from more flexible resins (low Tg) wi
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: C1520 − 02 (Reapproved 2015) C1520 − 20
Standard Guide for
1
Paintability of Latex Sealants
This standard is issued under the fixed designation C1520; 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
ε NOTE—Duplicate wording was deleted in 18.1 in July 2015.
1. Scope
1.1 This guide describes the practical considerations that may be used to determine the compatibility of a paint or coating to
be applied over a latex sealant or caulk. It evaluates the appearance and not the performance characteristics of the coated or painted
joint.
1.2 The committee with jurisdiction over this standard is not aware of any comparable standards published by other
organizations.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory requirementslimitations 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
E284 Terminology of Appearance
3. Terminology
3.1 Definitions—Refer to Terminology C717 for definitions of the following term(s) used in this guide: compatibility, cure, joint,
latex sealant. Refer to Terminology E284 for definitions of the following term(s) used in this guide: gloss.
3.2 color change—a change in either the observed (see Practice D1729) or measured color (see Test Method Practice D2244)
of a substance.
3.3 cracking—a failure resulting in a discontinuous film (of paint) or bead (of sealant).
4. Summary of Practice
4.1 This guide reviews many of the issues concerning the compatibility of latex sealants with paint. While the focus of this guide
is on latex sealants, the paint or coating may be of any composition.
5. Significance and Use
5.1 The intent of this guide is to provide the reader with information concerning possible reasons for paint failures where the
paint is used over a latex sealant.
1
This guide is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.10 on Specifications,
Guides and Practices.
Current edition approved June 1, 2015May 1, 2020. Published July 2015June 2020. Originally approved in 2002. Last previous edition approved in 20102015 as
ɛ1
C1520-02(2010).C1520-02(2015) . DOI: 10.1520/C1520-02R15E01.10.1520/C1520-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1520 − 20
CONSIDERATIONS
6. Temperature
6.1 Since standard testing is usually performed at “room temperature,” about 22°C,23°C, this would be considered the ideal
temperature for application and curing. As the temperature deviates from this ideal, the “science” of drying changes in as much
as that lower temperature results in slower drying and faster drying occurs at elevated temperatures.higher temperature results in
faster drying.
7. Percent Relative Humidity
7.1 In waterborne sealants, the humidity directly affects the ability of the system to lose water. retained water in the material.
Standard testing is typically doneperformed at 50 % RH, which allows for an acceptable water evaporation rate. Temperature and
humidity variations in clima
...