ASTM C1257-06

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C1257–06
Standard Test Method for
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Accelerated Weathering of Solvent-Release-Type Sealants
This standard is issued under the fixed designation C 1257; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method includes two laboratory accelerated 3.1 Definitions
exposure procedures for predicting the effects of ultraviolet or 3.1.1 Refer to Terminology C 717 andG113 for definitions
ultraviolet/visible radiation, heat, and moisture on color, chalk- of terms used in this test method.
ing, cracking, and adhesion of solvent-release sealants.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the
4.1 Four test specimens are prepared in U-shaped aluminum
standard. The values given in parentheses are for information
only. channels. After curing, three of the specimens are exposed in
the laboratory accelerated weathering device and the fourth
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the specimen is stored under standard conditions as an unexposed
file specimen.At the end of the exposure period, the specimens
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- are examined for chalking, color change, center cracking, edge
cracking, and loss of adhesion versus the unexposed file
bility of regulatory limitations prior to use.
1.4 Thecommitteewithjurisdictionoverthisstandardisnot specimen.
aware of any comparable standards published by other orga-
5. Significance and Use
nizations.
5.1 It is difficult to establish a precise correlation between
2. Referenced Documents
laboratory accelerated and natural weathering because of (1)
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2.1 ASTM Standards: geographical climatic variations, local weather variation from
normal, and local pollutants and (2) the fact that the accelera-
C 717 Terminology of Building Seals and Sealants
C 1442 Practice for Conducting Tests on Sealants Using tion factor is material dependent, varying with the type of
Artificial Weathering Apparatus material as well as its formulation. This test method is used to
determine the resistance of a sealant to laboratory accelerated
G113 Terminology Relating to Natural and Artificial
Weathering Tests of Nonmetallic Materials weathering and, if a control material with known outdoor
weathering performance is used, the relative weathering per-
G 151 Practice for Exposing Nonmetallic Materials in Ac-
celerated Test Devices that Use Laboratory Light Sources formance of the sealant against that of the control material.
5.2 Thistestmethodisconductedusingaluminumchannels.
G 154 Practice for Operating Fluorescent Light Apparatus
for UV Exposure of Nonmetallic Materials Other substrate materials may show different results.
G 155 Practice for Operating Xenon Arc Light Apparatus
6. Apparatus
for Exposure of Non-Metallic Materials
6.1 Exposure Apparatus:
6.1.1 Fluorescent UV/Condensation Apparatus, that con-
forms to the requirements in Practices G 151 and G 154 with
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ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
UVA-340 type lamps.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
6.1.2 Xenon-Arc Apparatus, that conforms to the require-
Weathering.
ments in Practices G 151 and G 155 with daylight type filters.
Current edition approved Jan. 1, 2006. Published February 2006. Originally
approved in 1994. Last previous edition approved in 2004 as C 1257-04.
6.2 Four-Mill Finish Aluminum U-Channels, 76 mm long
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3 3
by 19 mm wide by 9.5 mm deep (3 by ⁄4 by ⁄8 in.) inside
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
dimensions. Additional substrate materials may be specified.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.3 Steel Spatula.
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C1257–06
7. Procedure faces the light source. Keep the fourth test specimen as an
unexposed file specimen of the test material and store at
7.1 Condition sufficient compound in an original closed
standard conditions.
container for at least 24 h at standard conditions. Standard
7.4.1 Procedure for Fluorescent UV/Condensation
conditions are to be a temperature of 23 6 2°C (73 6 3.6°F)
Apparatus—Operate the device in accordance with the proce-
and relative
...