ASTM C1519-10(2017)
(Test Method)Standard Test Method for Evaluating Durability of Building Construction Sealants by Laboratory Accelerated Weathering Procedures
Standard Test Method for Evaluating Durability of Building Construction Sealants by Laboratory Accelerated Weathering Procedures
SIGNIFICANCE AND USE
4.1 This test method describes the procedure to evaluate or compare, or both, the durability of sealants when subjected to accelerated weathering and cyclic movement in a joint.
4.2 Sealant installation procedures, design considerations and movement during cure affect the aging processes and are fundamental to the success of any sealant. These factors are not addressed with this test method.
4.3 The amount, type and frequency of movement a sealant experiences during its lifetime strongly depends on the materials used in construction and on the orientation of the joint toward sunlight and many other factors that are not uniform or consistent.
4.4 Climatic exposures will differ with the orientation of the building and shading as well as with local and regional climatic conditions. Climates in a given location can vary from year to year because of differences in solar radiation, temperature, rainfall, and atmospheric conditions. Further, the quality and intensity of solar radiation on the earth's surface varies with geographic location, season, time of day, and cloud cover.
4.5 Variations in results may be expected when operating conditions are varied within the accepted limits of this test method. Therefore, all test results using this test method must be accompanied by a report of the specific operating conditions as required in Section 11. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to this test method.
4.6 The results of laboratory exposure cannot be directly extrapolated to estimate an absolute rate of deterioration caused by natural weathering because the acceleration factor is material dependent and can be significantly different for each material and for different formulations of the same material. However, exposure of a similar material of known outdoor performance, a control, along with the test specimens allows comparison of the durability relative to that of the control under ...
SCOPE
1.1 This test method covers the method for the determination of the durability of a sealant based on its ability to function in cyclic movement maintaining adhesion and cohesion after repeated exposure to laboratory accelerated weathering procedures.
1.2 This test method describes two laboratory accelerated weathering procedures for evaluating the durability of a sealant.
1.3 RILEM TC139–DBS is related to this test method.
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.
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Designation: C1519 − 10 (Reapproved 2017)
Standard Test Method for
Evaluating Durability of Building Construction Sealants by
Laboratory Accelerated Weathering Procedures
This standard is issued under the fixed designation C1519; 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 G113 Terminology Relating to Natural andArtificial Weath-
ering Tests of Nonmetallic Materials
1.1 This test method covers the method for the determina-
G141 Guide for Addressing Variability in Exposure Testing
tionofthedurabilityofasealantbasedonitsabilitytofunction
of Nonmetallic Materials
in cyclic movement maintaining adhesion and cohesion after
G151 Practice for Exposing Nonmetallic Materials inAccel-
repeated exposure to laboratory accelerated weathering proce-
erated Test Devices that Use Laboratory Light Sources
dures.
G154 Practice for Operating Fluorescent Ultraviolet (UV)
1.2 This test method describes two laboratory accelerated
Lamp Apparatus for Exposure of Nonmetallic Materials
weathering procedures for evaluating the durability of a
G155 Practice for Operating XenonArc LightApparatus for
sealant.
Exposure of Non-Metallic Materials
1.3 RILEM TC139–DBS is related to this test method.
2.2 RILEM Standard:
RILEMTC139–DBS Determination of changes in adhesion,
1.4 This standard does not purport to address all of the
cohesion, and appearance of elastic weatherproofing seal-
safety concerns, if any, associated with its use. It is the
ants for high movement facade joints after exposure to
responsibility of the user of this standard to establish appro-
artificial weathering
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3. Terminology
1.5 This international standard was developed in accor-
3.1 The definitions given in Terminology C717 on terms
dance with internationally recognized principles on standard-
relating to building seals and sealants and in Terminology
ization established in the Decision on Principles for the
G113 on terms relating to natural and artificial weathering tests
Development of International Standards, Guides and Recom-
are applicable to this test method.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Significance and Use
2. Referenced Documents
4.1 This test method describes the procedure to evaluate or
compare, or both, the durability of sealants when subjected to
2.1 ASTM Standards:
accelerated weathering and cyclic movement in a joint.
C717 Terminology of Building Seals and Sealants
C719 Test Method for Adhesion and Cohesion of Elasto-
4.2 Sealant installation procedures, design considerations
meric Joint Sealants Under Cyclic Movement (Hockman
and movement during cure affect the aging processes and are
Cycle)
fundamentaltothesuccessofanysealant.Thesefactorsarenot
C1442 Practice for Conducting Tests on Sealants Using
addressed with this test method.
Artificial Weathering Apparatus
4.3 The amount, type and frequency of movement a sealant
E177 Practice for Use of the Terms Precision and Bias in
experiences during its lifetime strongly depends on the mate-
ASTM Test Methods
rials used in construction and on the orientation of the joint
toward sunlight and many other factors that are not uniform or
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
consistent.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
4.4 Climatic exposures will differ with the orientation of the
Weathering.
Current edition approved Sept. 15, 2017. Published October 2017. Originally
buildingandshadingaswellaswithlocalandregionalclimatic
approved in 2002. Last previous edition approved in 2010 as C1519 - 10. DOI:
conditions. Climates in a given location can vary from year to
10.1520/C1519-10R17.
2 year because of differences in solar radiation, temperature,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Published in Materials and Structures2001, pp. 34579–588.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1519 − 10 (2017)
rainfall, and atmospheric conditions. Further, the quality and substrates as well. Substrates should be compatible with the
intensity of solar radiation on the earth’s surface varies with sealant, should not degrade under weathering, and should fit
geographic location, season, time of day, and cloud cover. into the joint movement apparatus. If primer is recommended
by the sealant manufacturer, it should be used in accordance
4.5 Variations in results may be expected when operating
with the manufacturer’s recommendations.
conditions are varied within the accepted limits of this test
method. Therefore, all test results using this test method must 6.2 Spacers, for the preparation of the specimens should be
beaccompaniedbyareportofthespecificoperatingconditions of a non-adherent material and of a shape to produce a sealant
as required in Section 11. Refer to Practice G151 for detailed joint as depicted in Test Method C719.
information on the caveats applicable to use of results obtained NOTE 2—If the spacers are made of a material to which the sealant
adheres, their surfaces should be made non-adherent, for example, by a
according to this test method.
thin wax coating.
4.6 The results of laboratory exposure cannot be directly
6.3 Non-Adherent Substance, for the preparation of test
extrapolated to estimate an absolute rate of deterioration
specimens, for example, polytetrafluoroethylene (PTFE) film
caused by natural weathering because the acceleration factor is
or vellum paper, preferably on the advice of the sealant
material dependent and can be significantly different for each
manufacturer.
material and for different formulations of the same material.
However, exposure of a similar material of known outdoor 6.4 Ventilated Convection-Type Oven, capable of being
maintained at 50 6 2°C.
performance, a control, along with the test specimens allows
comparison of the durability relative to that of the control
6.5 Artificial Weathering Device—Choice of type of appa-
under the test conditions. Evaluation in terms of relative
ratus and duration of exposure shall be by mutual agreement
durability also greatly improves the agreement in test results
among the interested parties. Because of differences in test
among different laboratories.
conditions, test results may differ with the type of apparatus
4.7 Results of this procedure will depend on the care that is used. Consult Practices G154 and G155 for differences in the
spectral power distributions of the exposure sources and
taken to operate the equipment according to Practices G154
and G155. Significant factors include regulation of the line Practice C1442 for the differences in test parameters in the two
types of apparatus specified.
voltage, freedom from salt or other deposits from water,
temperature control, humidity control, where applicable, con- 6.5.1 Fluorescent UV/Condensation Apparatus—Operate
dition and age of the burners and filters in xenon arc the device in accordance with Practice C1442, Section 7.3.
equipment, and age of lamps in fluorescent UV equipment. 6.5.2 Xenon Arc Light Apparatus—Operate the device in
NOTE 1—Additional information on sources of variability and on
accordance with Practice C1442, Section 7.2.
strategies for addressing variability in the design, execution and data
NOTE 3—The xenon arc ruggedness test was run at 70 % RH using an
analysis of laboratory accelerated exposure tests is found in Guide G141.
exposure cycle of 2 h light followed by 2 h light plus water spray for more
thorough wetting. The test results compared well with those of outdoor
5. Summary
exposures. Therefore, these conditions are considered an alternate to the
5.1 For this procedure, specimens are prepared in which the
default parameters.
sealant to be tested adheres to two parallel contact surfaces.
This procedure uses the same type of specimens, in the same
7. Preparation of Test Specimens
dimensions, and the same preparation and cure as described in
7.1 Adhere the sealant to be tested to two parallel contact
Test Method C719. While any substrates can be specified and
surfaces as described in Test Method C719. The user is to
used, this procedure was developed with anodized aluminum
specify the number of specimens.
substrates. Following cure, the specimens are placed in an
7.2 Unless specified otherwise, use anodized aluminum
artificial weathering chamber for 4 weeks. On removal from
substrates.
the weathering chamber, they are placed in a cyclic movement
machine and subjected to 6 cyclic movements of extension and
7.3 For each specimen, assemble two supports and two
compression at room temperature according to the method of
spacers as shown in Test Method C719 and set up on the
C719. Any degree of extension and compression can be used.
non-adherent substrate.
After the movement cycles the sealant is blocked open at the
7.4 Follow the instructions of the sealant manufacturer, for
recommended extension and examined for flaws. The cycle of
instance, whether a primer is to be used.
weathering followed by movement testing and examination is
repeated as often as specified. After each cycle, the number of 7.5 Fill the hollow space formed by supports and spacers
cycles is recorded as well as the mode of failure, that is,
shall be with sealant previously conditioned for 24 h at 23 6
cohesive or adhesive, amount of failure, the depth of any 2°C. The following precautions shall be taken:
cracks or breaks and other pertinent observations, such as
7.5.1 avoid the formation of air bubbles;
sealant deformation and bubble formation.
7.5.2 discardthefirst5gofsealantoutofthetube,cartridge
or dispenser;
6. Apparatus
7.5.3 press the sealant towards the contact surface of the
6.1 Aluminum Supports, for the preparation of test speci- supports; and
mens (two supports for each specimen).Anodized aluminum is 7.5.4 trim the sealant surfaces so that they are flush with the
the standard substrate, but this method can be used with other face of the supports and spacers.
C1519 − 10 (2017)
7.6 Backing materials and other joint formation aids should 10. Periods of Exposure and Evaluation of Results
beremovedassoonaspossible,consistentwithnodeformation
10.1 In most cases, periodic evaluation of materials is
of the sealant, to assist in the curing process.
necessary to determine when significant changes occur.
10.2 The time of radiant exposure necessary to produce a
8. Conditioning
defined change in a material property can be used to evaluate
8.1 The specimens shall be conditioned or cured following
or rank the stability of materials. This method is more reliable
the procedures of Test Method C719, Section 8.
than evaluating materials after an arbitrary exposure time or
radiant exposure.
9. Test Procedure
10.2.1 Exposure to an arbitrary time or radiant exposure
may be used for the purpose of a specific test if agreed upon by
9.1 After completion of 7.6 process, place the test speci-
the parties concerned or if required for conformance to a
mens in an artificial weathering device so that the sealant
particular specification.When a single exposure period is used,
surface (top of the joint) faces the exposure source.The face of
select a time or radiant exposure that will produce the largest
the samples are positioned at the specified distance from the
performance differences between the test materials.
exposure source.
10.2.2 In the development of a specification, the minimum
9.1.1 If the specimens do not completely fill the racks, fill
exposure time shall be that necessary to produce a substantial
the empty spaces with blank metal panels to maintain the test
change in the property of interest for the least stable material
conditions within the chamber.
being evaluated. An exposure time that produces a significant
9.1.2 Specimens should be confined to an exposure area
change in one type of material cannot be assumed to be
where the irradiance is at least 90 % of that measured at the
applicable to other types of materials.
center of the exposure area. Unless it is shown that irradiance
uniformity meets the requirements of Practice G151, section
11. Report
5.1.3 for no repositioning, use one of the procedures described
11.1 The report shall make reference to this test method and
in section 5.1.4 to insure that all specimens receive radiant
shall include the following information:
exposures that are as similar as possible. Irradiance uniformity
11.1.1 The name and type of sealant;
can be determined in accordance with Practice G151, Section
11.1.2 The batch of sealant from which the specimens were
A1.
produced, if possible;
9.1.3 Operate the artificial weathering device according to
11.1.3 The type of support material if different than the
the specifications in 6.5 for 4 weeks.
standard of anodized aluminum;
NOTE 4—If the irradiance level of the xenon arc apparatus is set at 0.35
11.1.4 The primer used, if applicable;
rather than 0.51 W/m .nm) at 340 nm, operate it for 5.8 weeks instead of
11.1.5 Weathering information to conform to the Report
4 weeks. (SeeAnnexA1.2.1 in C1442 for determination of exposure time
at other irradiance levels.
section of Practice G151 plus the following:
11.1.5.1 Type, manufacturer and model of artificial weath-
9.2 At the end of the 4 weeks in the artificial weathering
ering apparatus used,
machine, test the sealant to 6 movement cycles as described in
11.1.5.2 Irradiance level and actual time (number of hours)
Test Method C719, sections 9.4 and 9.5 (room temperature
in weathering apparatus.
movement), at the prescribed movement amplitude.
11.1.6 The amplitude of extension/compression used for the
9.2.1 Extend the specimen to the prescribed maximum
movement cycles;
extension and block open with appropriate spacers. Examine
11.1.7 Whetherornotflawsoccurred,and,iftheaffirmative,
the sealants for any flaws. Flaws include any cracks, breaks,
the cycle at which they occurred, types of flaws (adhesion or
adhesive or cohesive loss. Measure and record the depth of any
cohesion or other types), and depth of any flaws; and
crack or flaw and any pertinent observations. Observations
11.1.8 Any deviations from the specified procedures and
should be recorded on a scale o
...
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.
Designation: C1519 − 10 C1519 − 10 (Reapproved 2017)
Standard Test Method for
Evaluating Durability of Building Construction Sealants by
Laboratory Accelerated Weathering Procedures
This standard is issued under the fixed designation C1519; 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
1.1 This test method covers the method for the determination of the durability of a sealant based on its ability to function in
cyclic movement maintaining adhesion and cohesion after repeated exposure to laboratory accelerated weathering procedures.
1.2 This test method describes two laboratory accelerated weathering procedures for evaluating the durability of a sealant.
1.3 RILEM TC139–DBS is related to this test method.
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 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.
2. Referenced Documents
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
C719 Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
C1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G141 Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials
2.2 RILEM Standard:
RILEM TC139–DBS Determination of changes in adhesion, cohesion, and appearance of elastic weatherproofing sealants for
high movement facade joints after exposure to artificial weathering
3. Terminology
3.1 The definitions given in Terminology C717 on terms relating to building seals and sealants and in Terminology G113 on
terms relating to natural and artificial weathering tests are applicable to this test method.
4. Significance and Use
4.1 This test method describes the procedure to evaluate or compare, or both, the durability of sealants when subjected to
accelerated weathering and cyclic movement in a joint.
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
Weathering.
Current edition approved July 15, 2010Sept. 15, 2017. Published September 2010October 2017. Originally approved in 2002. Last previous edition approved in 20042010
as C1519 - 04.C1519 - 10. DOI: 10.1520/C1519-10.10.1520/C1519-10R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Published in Materials and Structures2001, pp. 34579–588.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1519 − 10 (2017)
4.2 Sealant installation procedures, design considerations and movement during cure affect the aging processes and are
fundamental to the success of any sealant. These factors are not addressed with this test method.
4.3 The amount, type and frequency of movement a sealant experiences during its lifetime strongly depends on the materials
used in construction and on the orientation of the joint toward sunlight and many other factors that are not uniform or consistent.
4.4 Climatic exposures will differ with the orientation of the building and shading as well as with local and regional climatic
conditions. Climates in a given location can vary from year to year because of differences in solar radiation, temperature, rainfall,
and atmospheric conditions. Further, the quality and intensity of solar radiation on the earth’s surface varies with geographic
location, season, time of day, and cloud cover.
4.5 Variations in results may be expected when operating conditions are varied within the accepted limits of this test method.
Therefore, all test results using this test method must be accompanied by a report of the specific operating conditions as required
in Section 11. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to this
test method.
4.6 The results of laboratory exposure cannot be directly extrapolated to estimate an absolute rate of deterioration caused by
natural weathering because the acceleration factor is material dependent and can be significantly different for each material and
for different formulations of the same material. However, exposure of a similar material of known outdoor performance, a control,
along with the test specimens allows comparison of the durability relative to that of the control under the test conditions. Evaluation
in terms of relative durability also greatly improves the agreement in test results among different laboratories.
4.7 Results of this procedure will depend on the care that is taken to operate the equipment according to Practices G154 and
G155. Significant factors include regulation of the line voltage, freedom from salt or other deposits from water, temperature
control, humidity control, where applicable, condition and age of the burners and filters in xenon arc equipment, and age of lamps
in fluorescent UV equipment.
NOTE 1—Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of
laboratory accelerated exposure tests is found in Guide G141.
5. Summary
5.1 For this procedure, specimens are prepared in which the sealant to be tested adheres to two parallel contact surfaces. This
procedure uses the same type of specimens, in the same dimensions, and the same preparation and cure as described in Test Method
C719. While any substrates can be specified and used, this procedure was developed with anodized aluminum substrates.
Following cure, the specimens are placed in an artificial weathering chamber for 4 weeks. On removal from the weathering
chamber, they are placed in a cyclic movement machine and subjected to 6 cyclic movements of extension and compression at
room temperature according to the method of C719. Any degree of extension and compression can be used. After the movement
cycles the sealant is blocked open at the recommended extension and examined for flaws. The cycle of weathering followed by
movement testing and examination is repeated as often as specified. After each cycle, the number of cycles is recorded as well as
the mode of failure, that is, cohesive or adhesive, amount of failure, the depth of any cracks or breaks and other pertinent
observations, such as sealant deformation and bubble formation.
6. Apparatus
6.1 Aluminum Supports, for the preparation of test specimens (two supports for each specimen). Anodized aluminum is the
standard substrate, but this method can be used with other substrates as well. Substrates should be compatible with the sealant,
should not degrade under weathering, and should fit into the joint movement apparatus. If primer is recommended by the sealant
manufacturer, it should be used in accordance with the manufacturer’s recommendations.
6.2 Spacers, for the preparation of the specimens should be of a non-adherent material and of a shape to produce a sealant joint
as depicted in Test Method C719.
NOTE 2—If the spacers are made of a material to which the sealant adheres, their surfaces should be made non-adherent, for example, by a thin wax
coating.
6.3 Non-Adherent Substance, for the preparation of test specimens, for example, polytetrafluoroethylene (PTFE) film or vellum
paper, preferably on the advice of the sealant manufacturer.
6.4 Ventilated Convection-Type Oven, capable of being maintained at 50 6 2°C.
6.5 Artificial Weathering Device—Choice of type of apparatus and duration of exposure shall be by mutual agreement among
the interested parties. Because of differences in test conditions, test results may differ with the type of apparatus used. Consult
Practices G154 and G155 for differences in the spectral power distributions of the exposure sources and Practice C1442 for the
differences in test parameters in the two types of apparatus specified.
6.5.1 Fluorescent UV/Condensation Apparatus—Operate the device in accordance with Practice C1442, Section 7.3.
6.5.2 Xenon Arc Light Apparatus—Operate the device in accordance with Practice C1442, Section 7.2.
NOTE 3—The xenon arc ruggedness test was run at 70 % RH using an exposure cycle of 2 h light followed by 2 h light plus water spray for more
C1519 − 10 (2017)
thorough wetting. The test results compared well with those of outdoor exposures. Therefore, these conditions are considered an alternate to the default
parameters.
7. Preparation of Test Specimens
7.1 Adhere the sealant to be tested to two parallel contact surfaces as described in Test Method C719. The user is to specify
the number of specimens.
7.2 Unless specified otherwise, use anodized aluminum substrates.
7.3 For each specimen, assemble two supports and two spacers as shown in Test Method C719 and set up on the non-adherent
substrate.
7.4 Follow the instructions of the sealant manufacturer, for instance, whether a primer is to be used.
7.5 Fill the hollow space formed by supports and spacers shall be with sealant previously conditioned for 24 h at 23 6 2°C.
The following precautions shall be taken:
7.5.1 avoid the formation of air bubbles;
7.5.2 discard the first 5 g of sealant out of the tube, cartridge or dispenser;
7.5.3 press the sealant towards the contact surface of the supports; and
7.5.4 trim the sealant surfaces so that they are flush with the face of the supports and spacers.
7.6 Backing materials and other joint formation aids should be removed as soon as possible, consistent with no deformation of
the sealant, to assist in the curing process.
8. Conditioning
8.1 The specimens shall be conditioned or cured following the procedures of Test Method C719, Section 8.
9. Test Procedure
9.1 After completion of 7.6 process, place the test specimens in an artificial weathering device so that the sealant surface (top
of the joint) faces the exposure source. The face of the samples are positioned at the specified distance from the exposure source.
9.1.1 If the specimens do not completely fill the racks, fill the empty spaces with blank metal panels to maintain the test
conditions within the chamber.
9.1.2 Specimens should be confined to an exposure area where the irradiance is at least 90 % of that measured at the center of
the exposure area. Unless it is shown that irradiance uniformity meets the requirements of Practice G151, section 5.1.3 for no
repositioning, use one of the procedures described in section 5.1.4 to insure that all specimens receive radiant exposures that are
as similar as possible. Irradiance uniformity can be determined in accordance with Practice G151, Section A1.
9.1.3 Operate the artificial weathering device according to the specifications in 6.5 for 4 weeks.
NOTE 4—If the irradiance level of the xenon arc apparatus is set at 0.35 rather than 0.51 W/m .nm) at 340 nm, operate it for 5.8 weeks instead of 4
weeks. (See Annex A1.2.1 in C1442 for determination of exposure time at other irradiance levels.
9.2 At the end of the 4 weeks in the artificial weathering machine, test the sealant to 6 movement cycles as described in Test
Method C719, sections 9.4 and 9.5 (room temperature movement), at the prescribed movement amplitude.
9.2.1 Extend the specimen to the prescribed maximum extension and block open with appropriate spacers. Examine the sealants
for any flaws. Flaws include any cracks, breaks, adhesive or cohesive loss. Measure and record the depth of any crack or flaw and
any pertinent observations. Observations should be recorded on a scale of 0 to 5, with 0 indicating no observed change, and 5
indicating excessive change. Remove the blocks and allow the samples to recover to the dimensions of the sealant at initial cure.
NOTE 5—A rating of 0 to 5 is a subjective evaluation and is useful for an individual laboratory to compare surface appearance but is less useful for
comparing results between laboratories.
9.3 Other measurements such as hardness, tensile strength, elongation and modulus can also be made, if specified.
9.4 The artificial weathering exposure, the movement test, the examination and measurements of any flaws represent one cycle
of this durability procedure.
9.5 The cycle is to be repeated as often as is specified. Observations and measurements are to be made and recorded at the end
of each cycle.
10. Periods of Exposure and Evaluation of Results
10.1 In most cases, periodic evaluation of materials is necessary to determine when significant changes occur.
10.2 The time of radiant exposure necessary to produce a defined change in a material property can be used to evaluate or rank
the stability of materials. This method is more reliable than evaluating materials after an arbitrary exposure time or radiant
exposure.
10.2.1 Exposure to an arbitrary time or radiant exposure may be used for the purpose of a specific test if agreed upon by the
parties concerned or if required for conformance to a particular specification. When a single exposure period is used, select a time
or radiant exposure that will produce the largest performance differences between the test materials.
C1519 − 10
...
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