ASTM C1850-17

Standard Guide for Improved Laboratory Accelerated Tests to Predict the Weathering and for Use in Developing Protocols to Predict the Design Life of Building Sealant Systems

SIGNIFICANCE AND USE
4.1 This guide is intended to serve as a reference of recommended methodology for users developing relevant, reliable and valid tests for predicting natural weathering effects and for use in developing methods to determine design life of building sealant systems through the use of accelerated test protocols. The proposed standard corrects for some of the deficiencies of existing laboratory accelerated tests of sealants.  
4.2 The development of accelerated weathering tests capable of being used in protocols to reliably and accurately predict the long-term in-service performance of building sealant systems have limitations due to:  
4.2.1 The external factors that affect functional properties, which are numerous and require effort to quantify, so that many existing accelerated procedures do not include all factors of importance, and  
4.2.2 The sealant specimens are often tested in configurations different from those used in-service.
SCOPE
1.1 This guide describes the steps for developing improved laboratory accelerated weathering tests for predicting the natural weathering effects on building sealant systems and for using those tests in development of methods for design life prediction of the systems.  
1.2 This guide outlines a systematic approach to development of laboratory accelerated weathering tests of building sealant systems including the identification of needed information, the development of accelerated tests, the application of data, and the reporting of results.  
1.3 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: Historical
• Publication Date: 14-Mar-2017
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.20 - General Test Methods

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C1850 −17
Standard Guide for
Improved Laboratory Accelerated Tests to Predict the
Weathering and for Use in Developing Protocols to Predict
1
the Design Life of Building Sealant Systems
This standard is issued under the fixed designation C1850; 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 3.2.2 building sealant system component—a part of a build-
ing sealant system that may include a combination of building
1.1 This guide describes the steps for developing improved
materials, such as cladding, substrates or the sealant.
laboratory accelerated weathering tests for predicting the
3.2.3 building sealant system material—a material that may
natural weathering effects on building sealant systems and for
be used in a building sealant system.
using those tests in development of methods for design life
prediction of the systems.
3.2.4 critical performance characteristic(s)—a property, or
group of properties, of a building sealant system that must be
1.2 This guide outlines a systematic approach to develop-
maintained above a certain minimum level.
ment of laboratory accelerated weathering tests of building
sealant systems including the identification of needed
3.2.5 degradation mechanism—the chemical reactions in-
information, the development of accelerated tests, the applica-
duced in a building component or material by one or more
tion of data, and the reporting of results.
degradation factors resulting in changes in one or more of the
critical performance characteristics.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.2.6 incompatibility factor—any of the group of degrada-
ization established in the Decision on Principles for the
tion factors that result from detrimental chemical and physical
Development of International Standards, Guides and Recom-
interactions between building components or materials.
mendations issued by the World Trade Organization Technical
3.2.7 in-service test—a test in which building components
Barriers to Trade (TBT) Committee.
ormaterialsareexposedtodegradationfactorsunderin-service
conditions.
2. Referenced Documents
3.2.8 performance criterion—a quantitative statement of a
2
2.1 ASTM Standards:
level of properties for a selected characteristic of a component
C717 Terminology of Building Seals and Sealants
or material needed to ensure compliance with a functional
G113 Terminology Relating to Natural andArtificial Weath-
requirement.
ering Tests of Nonmetallic Materials
3.2.9 property measurement test—a test for measuring one
or more properties of building components or materials.
3. Terminology
3.2.10 load stress factor—anydegradationfactorsthatresult
3.1 Definitions—For definitions of terms used in this guide,
fromexternallyappliedsustainedorperiodicmechanicalloads.
refer to Terminologies C717 and G113.
3.2.11 use factor—any factor that affects the material as a
3.2 Definitions of Terms Specific to This Standard:
result of the design of the system, installation and maintenance
3.2.1 biological degradation factor—degradation factors di-
procedures, normal wear and tear, and user abuse. (Example:
rectly associated with living organisms, including
abrasion of foot traffic.)
microorganisms, fungi, and bacteria.
3.2.12 weathering factors—any degradation factors associ-
ated with the natural environment, including radiation,
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ThisguideisunderthejurisdictionofASTMCommitteeC24onBuildingSeals
temperature, rain and other forms of water, freezing and
and Sealants and is the direct responsibility of Subcommittee C24.20 on General
thawing.
Test Methods.
Current edition approved March 15, 2017. Published April 2017. DOI: 10.1520/
4. Significance and Use
C1850-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1 This guide is intended to serve as a reference of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
recommended methodology for users developing relevant,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. reliable and valid tests for predicting natural weathering effects
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1850−17
and for use in developing methods to determine design life of on sealants and for use in development of methods for
building sealant systems through the use of accelerated test estimating design life (see Fig. 1 for a flow chart).
protocols. The p
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