ASTM C1501-01
(Test Method)Standard Test Method for Color Stability of Building Construction Sealants as Determined by Laboratory Accelerated Weathering Procedures
Standard Test Method for Color Stability of Building Construction Sealants as Determined by Laboratory Accelerated Weathering Procedures
SCOPE
1.1 This test method describes laboratory accelerated weathering procedures using either fluorescent ultraviolet or xenon arc test devices for determining the color stability of building construction sealants.
1.2 Color stability rankings provided by these two procedures may not agree.
1.3 The values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only.
1.4 There is no equivalent ISO standard for this test method.
1.5 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.
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Designation: C 1501 – 01
Standard Test Method for
Color Stability of Building Construction Sealants as
Determined by Laboratory Accelerated Weathering
Procedures
This standard is issued under the fixed designation C 1501; 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 for UV Exposure of Nonmetallic Materials
G 155 Practice for Operating Xenon Arc Light Apparatus
1.1 This test method describes laboratory accelerated
for Exposure of Nonmetallic Materials
weathering procedures using either fluorescent ultraviolet or
2.2 CIE Documents:
xenon arc test devices for determining the color stability of
CIE Publication Number 85: 1989, Technical Report-Solar
building construction sealants.
Spectral Irraidiance
1.2 Color stability rankings provided by these two proce-
dures may not agree.
3. Terminology
1.3 The values stated in SI units are to be regarded as the
3.1 Definitions—Definitions of the following terms are
standard. Values given in parentheses are for information only.
found in ASTM standard C 717: compound, cure, sealant, and
1.4 There is no equivalent ISO standard for this test method.
substrate. Definitions of the following terms are found in
1.5 This standard does not purport to address all of the
ASTM standard G 113: sample, file specimen, control material,
safety concerns, if any, associated with its use. It is the
fluorescent ultraviolet lamps, xenon arc, irradiance, radiant
responsibility of the user of this standard to establish appro-
exposure, spectral power distribution, solar radiation-
priate safety and health practices and determine the applica-
ultraviolet, solar radiation-visible.
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
4.1 Specimens for this procedure are prepared in which the
2.1 ASTM Standards:
sealant to be tested adheres to flat aluminum panels. While any
C 717 Definitions of Terms Relating to Building Seals and
2 surface can be specified and used, this test method was
Sealants
developed with aluminum panels. At least four replicates of
C 1442 Practice for Conducting Tests on Sealants using
2 each sealant being tested are required. After curing, one
Artificial Weathering Apparatus
replicate of each sealant being tested is retained as a file
D 1729 Practice for Visual Evaluation of Color Differences
3 specimen and at least three replicates are exposed to actinic
of Opaque Materials
radiation, heat and moisture. At the end of the exposure period,
D 2244 Test Method for Calculation of Color Differences
3 the test sealant is examined for color change by comparison to
from Instrumentally Measured Color Coordinates
the unexposed file specimen.
G 113 Terminology Relating to Natural and Artificial
4 4.2 As recommended in ASTM G 151 Section 4.2, unless
Weathering tests for Nonmetallic Materials
several test sealants are exposed to determine their relative
G 147 Practice for Conditioning and Handling of Nonme-
4 color stabilities, one or two control sealants of similar compo-
tallic Materials for Natural and Artificial Weathering
sition and construction to the test specimen and having known
G 151 Practice for Exposing Nonmetallic Materials in Ac-
color stability should be exposed simultaneously with the test
celerated Test Devices That Use Laboratory Light
4 specimen to rank the color stability of the latter compared with
Sources
the color stability of the control(s).
G 154 Practice for Operating Fluorescent Light Apparatus
5. Significance and Use
5.1 This test method is intended to induce color changes in
This test method is under the jurisdiction of ASTM Committee C24 on Building
sealants, as well as their constituent pigments, associated with
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
end-use conditions, including the effects of sunlight, moisture,
Weathering.
Current edition approved June 10, 2001. Published August 2001.
Annual Book of ASTM Standards, Vol 04.07.
Annual Book of ASTM Standards, Vol 06.01.
4 5
Annual Book of ASTM Standards, Vol 14.02. CIE Central Bureau, Vienna, Kegelgasse 27, A-1030 Wien, Austria
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C1501–01
and heat. The exposures used in this test method are not maintained at 0.77 6 0.12 W/(m · nm) at 340 nm for devices
intended to simulate the color change of a sealant caused by without irradiance control and 0.77 6 0.05 W/(m · nm) at 340
localized weathering phenomena, such as atmospheric pollu- nm 6 when using devices with irradiance control.
tion, biological attack, and saltwater exposure.
6.7.2 Laboratory Light Source —Xenon Arc light source in
5.2 When conducting exposures in devices that use labora-
accordance with Practice G 155. Use the following exposure
tory light sources, it is important to consider how well the
conditions: Daylight filters; Irradiance at the control point shall
artificial test conditions will reproduce property changes and
be maintained at 0.50 6 0.03 W/(m · nm) at 340 nm, or the
2 2
failure modes associated with end-use environments for the
equivalent of 55 63.5 W/m at 300-400 nm or 530 6 30 W/m
sealant being tested. Information on the use and interpretation
at 300-800 nm; Exposure cycle of 102 minutes light at 63
of data from accelerated exposure tests is provided in ASTM
(62.5) °C uninsulated black panel temperature, followed by 18
G 151.
minutes light and water spray or immersion in water. Control
5.3 When this test method is used as part of a specification,
relative humidity at the control point at a minimum of 55 6 5%
exact procedure, test conditions, test duration and evaluation RH, preferably as high as 70 65% RH, during the light only
technique must be specified. Results obtained between the two
period.
procedures may vary, because the spectral power distribution
NOTE 2—CIE Publication No. 85-1989 provides data on solar spectral
of the light sources (fluorescent UV and xenon arc) differ.
irradiance for typical atmospheric conditions, which can be used as a basis
Sealants should not be compared to each other based on the
for comparing laboratory light sources with daylight. For example, global
results obtained in different types of apparatus.
solar irradiance is 0.68 W/(m · nm) at 340 nm as presented in CIE 85 table
5.4 These devices are capable of matching ultraviolet solar
4.
radiation reasonably well. However, for sealants sensitive to
6.7.3 Moisture—The test specimens may be exposed to
long wavelength UV and visible solar radiation, the absence of
moisture in the form of water spray, condensation, immersion,
this radiation in the fluorescent UV apparatus can distort color
or high humidity as agreed on by the mutual parties. Refer to
stability ranking when compared to exterior environment
Practice G 151 Section 6.6 for discussion of the various forms
exposure.
of moisture in accelerated test devices.
NOTE 1—Refer to Practices G 151 for full cautionary guidance regard-
ing laboratory weathering of non-metallic materials.
7. Procedure
7.1 Condition sufficient sealant in an original closed con-
6. Apparatus
tainer for at least 24 hours at standard conditions. Standard
6.1 Aluminum Panels—Apply sealant to four aluminum
conditions are a temperature of 2362°C (7363.6°F) and
panels, alloy 3003 H14, dimensions, 152mm by 76mm by
relative humidity of 5065%, away from light.
0.64mm thick (6 by 3 by 0.025 inches thick), using rectangular
7.2 Prepare at least four sealant test specimens and at least
Brass Frame described in 6.3. Other substrate materials are
four of the control material, if used, on aluminum panels. Clean
acceptable when specified.
the aluminum panels using cleaning solvent. Allow solvent to
6.2 Spatula, steel, about 150 mm (6 inches) long.
dry before applying sealant.
6.3 Rectangular Brass Frame, with outside dimensions of
7.3 Position the brass frame on the aluminum panel and
approximately 152mm by 76mm, and inside dimensions 75mm
overfill the entire frame with conditioned sealant. Strike off flat
by 65mm by 3.0mm (3 inches long by 2.5 inches wide by 0.125
using the spatula. Immediately separate the sealant from the
inches deep).
frame by running a thin bladed knife along the inside of the
6.4 Thin Bladed Knife.
frame. Lift the frame from the aluminum panel.
6.5 Color Evaluation Apparatus:
7.4 Cure the test specimens at standard conditions for 21
6.5.1 Lighting Equipment, to evaluate color difference ac-
days. Other conditions for curing are acceptable when specified
cording to D 1729; or,
provided they meet the following requirements: 1) the curing
6.5.2 Spectrophotometer, complying with Practice E 1164;
period shall not exceed 21 days, and 2) the temperature during
or,
the curing period shall not exceed 50°C (122°F). Keep one test
6.5.3 Colorimeter, complying with Test Method D 2244.
specimen as an unexposed file specimen and store at standard
6.6 Cleaning Solvent, isopropyl alcohol.
conditions.
6.7 Test Chamber—Choice of apparatus and exposure con-
7.5 Place at least three of the cured specimens and the
ditions selected will be by mutual agreement among the
control material if used, in the weathering apparatus with the
interested parties . The test cycles listed have been used by
sealant surface facing the radiation source.
historical convention and may not adequately simulate the
7.6 Apparatus shall be operated continuously. However, if
effects of outdoor exposure of sealants. Other cycles can be
the test needs to be interrupted to perform routine maintenance
used by mutual agreement of all concerned parties.
or inspection, it should be during a dry period.
6.7.1 Laboratory Ultraviolet S
...
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