ASTM C793-04

Standard Test Method for Effects of Accelerated Weathering on Elastomeric Joint Sealants

SCOPE
1.1 This test method covers a laboratory procedure for determining the effects of accelerated weathering on cured-in-place elastomeric joint sealants (single- and multicomponent) for use in building construction.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other ASTM committees or other organizations.
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: 30-Jun-2004
• ICS: 83.060 - Rubber
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.40 - Weathering

Relations

• Replaces: ASTM C793-02 - Standard Test Method for Effects of Accelerated Weathering on Elastomeric Joint Sealants
• Effective Date: 01-Jul-2004
• Replaced By: ASTM C793-05 - Standard Test Method for Effects of Laboratory Accelerated Weathering on Elastomeric Joint Sealants
• Effective Date: 01-Jul-2005
• Referred By: ASTM D5893/D5893M-16(2021) - Standard Specification for Cold-Applied, Single-Component, Chemically Curing Silicone Joint Sealant for Portland Cement Concrete Pavements
• Effective Date: 01-Jul-2004
• Referred By: ASTM D8138-23 - Standard Specification for Preformed Silicone Joint Sealing System for Bridges
• Effective Date: 01-Jul-2004
• Referred By: ASTM C920-18 - Standard Specification for Elastomeric Joint Sealants
• Effective Date: 01-Jul-2004
• Referred By: ASTM C1193-16(2023) - Standard Guide for Use of Joint Sealants
• Effective Date: 01-Jul-2004
• Referred By: ASTM C1021-08(2023) - Standard Practice for Laboratories Engaged in Testing of Building Sealants
• Effective Date: 01-Jul-2004

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C793–04
Standard Test Method for
Effects of Laboratory Accelerated Weathering on
1
Elastomeric Joint Sealants
This standard is issued under the fixed designation C793; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) 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 Three sealant specimens are spread on aluminum plates
determining the effects of accelerated weathering on cured-in- and exposed in one of the laboratory accelerated weathering
place elastomeric joint sealants (single- and multicomponent) chambers specified in Section 6 and operated in accordance
for use in building construction. with specifications in Section 8 and Practice C1442.
1.2 The values stated in SI units are to be regarded as the 4.2 Following this treatment the specimens are exposed for
standard. The values in parentheses are for information only. 24 h in a freezer maintained at −26 6 2°C (−15 6 4°F).
1.3 Thecommitteewithjurisdictionoverthisstandardisnot 4.3 At the end of the cold exposure, the specimens are bent
aware of any comparable standards published by otherASTM over a mandrel within1satthe specified temperature.
committees or other organizations.
5. Significance and Use
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.1 It is known that solar radiation contributes to the
degradation of sealants in exterior building joints.The use of a
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- laboratory accelerated weathering machine with actinic, mois-
tureandheatappearstobeafeasiblemeanstogiveindications
bility of regulatory limitations prior to use.
of early degradation by the appearance of sealant cracking.
2. Referenced Documents
However, simulated weather factors in combination with ex-
2
2.1 ASTM Standards: tension may produce more severe degradation than weather
C717 Terminology of Building Seals and Sealants factors only. Therefore, the effect of the weathering test is
C1442 Practice for Conducting Tests on Sealants Using made more sensitive by the addition of the bending of the
Artificial Weathering Apparatus specimen at cold temperature.
G151 Practice for Exposing Nonmetallic Materials in Ac-
6. Apparatus
celerated Test Devices that use Laboratory Light Sources
6.1 Exposure Apparatus—The exposure apparatus shall be
3. Terminology
one of the three types of laboratory accelerated weathering
3.1 Definitions—See Terminology C717 for applicable devices described in Practice C1442 that use either xenon arc,
definitions of the following terms: cure, elastomeric, joint, fluorescent UV, or open flame carbon arc radiation. Consult
sealant, and substrate. Practice C1442, Section 5.3 for the differences in test param-
eters among the devices. Because of differences in test condi-
tions, test results may differ with the type of device used. The
choice of device shall be by mutual agreement among the
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
interested parties.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
6.2 Freezer or Cold Box, having a temperature controlled
Weathering.
at−26 6 2°C (−15 6 4°F).
Current edition approved July 1, 2004. Published August 2004. Originally
approved in 1975. Last previous edition approved in 2002 as C793–02.
6.3 Rectangular Brass Frame, with inside dimensions 130
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1 1
by40by3mm(5by1 ⁄2 by ⁄8 in.).
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.4 Aluminum Plates,three,each152by80by0.3mm(6by
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 3 by 0.01 in.).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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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.
C793–04
1
arc exposure tiem required to obtain the same radiant exposure at other
6.5 Steel Mandrel, 12.7 mm ( ⁄2 in.) in diameter and about
irradiance levels.
102 mm (4 in.) long.
6.6 Thin-Bladed Knife.
8.1.4 At the end of exposure, remove the specimens from
6.7 Straightedge, metal or plastic, about 152 mm (6 in.)
the machine and note changes in appearance as compared with
long.
the unexposed file specimen.
6.8 Spatula, stee
...