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ASTM G53-96

(Practice)

Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials (Withdrawn 2000)

Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials (Withdrawn 2000)

SCOPE
1.1 This practice covers the basic principles and operating procedures for using fluorescent ultraviolet (UV) and condensation apparatus to simulate the deterioration caused by sunlight and water as rain or dew.  
1.2 This practice is limited to the method of obtaining, measuring, and controlling the conditions and procedures of exposure. It does not specify the exposure conditions best suited for the material to be tested. Specimen preparation and evaluation of the results are covered in ASTM test methods or specifications for specific materials.  
1.3 The values stated in SI units are to be regarded as the standard.  
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
Withdrawn
Publication Date
09-Jan-1996
ICS
83.080.01 - Plastics in general
Technical Committee
G03 - Weathering and Durability
Drafting Committee
G03.03 - Simulated and Controlled Exposure Tests
Current Stage
Ref Project

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ASTM G53-96 - Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials (Withdrawn 2000)ASTM G53-96 - Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials (Withdrawn 2000)
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ASTM G53-96 - Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials (Withdrawn 2000)
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Standards Content (Sample)

Designation: G 53 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Operating Light- and Water-Exposure Apparatus
(Fluorescent UV-Condensation Type) for Exposure of
1
Nonmetallic Materials
This standard is issued under the fixed designation G 53; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Terminology
1.1 This practice covers the basic principles and operating 3.1 Definitions of Terms Specific to This Standard:
procedures for using fluorescent ultraviolet (UV) and conden- 3.1.1 irradiance—the radiation incident on a surface ex-
2
sation apparatus to simulate the deterioration caused by sun- pressed in W/m . Irradiance is the total of the incident radiation
light and water as rain or dew. at all wavelengths. Forty watt fluorescent lamps of the UV-B
1.2 This practice is limited to the method of obtaining, and UV-A types generate similar amounts of irradiance.
measuring, and controlling the conditions and procedures of However, since this irradiance is distributed at different wave-
exposure. It does not specify the exposure conditions best lengths, the photochemical effects caused by these different
suited for the material to be tested. Specimen preparation and lamps vary greatly. Therefore, irradiance should not be used to
evaluation of the results are covered in ASTM test methods or compare UV light sources.
specifications for specific materials. 3.1.2 spectral irradiance—distribution of irradiance as a
2
1.3 The values stated in SI units are to be regarded as the function of wavelength. It is expressed in W/m per wave-
standard. length band. The spectral irradiance of sunlight is often shown
2
1.4 This standard does not purport to address all of the as W/m per 10 nm band. The spectral irradiance of fluorescent
safety concerns, if any, associated with its use. It is the UV lamps should be shown in bands 1 or 2 nm wide. Spectral
responsibility of the user of this standard to establish appro- irradiance is the proper method for comparing sources with
priate safety and health practices and determine the applica- different energy distributions.
bility of regulatory limitations prior to use. 3.1.3 spectral energy distribution (SED)—general term for
the characterization of the amount of radiation present at each
2. Referenced Documents
wavelength. SEDs can be expressed by power in watts,
2
2.1 ASTM Standards:
irradiance in W/m , or energy in joules. The shape of the SED
E 220 Method for Calibration of Thermocouples by Com- would be identical in all of these units. Fluorescent lamps are
2
parison Techniques
frequently described by relative SEDs which show the amount
E 691 Practice for Conducting an Interlaboratory Study for
of radiation at each wavelength as a percentage of the amount
3
Determining the Precision of a Test Method of radiation at the peak wavelength. Fig. 1 is a relative SED.
G 7 Practice for Atmospheric Environmental Exposure
3.1.4 ultraviolet regions—CIE Publication No. 20 (1972)
4
Testing of Nonmetallic Materials divides the ultraviolet spectrum into three regions: UV-A,
2.2 CIE Standard:
radiation in wavelengths between 315 nm and 400 nm; UV-B,
No. 20 Recommendations for the Integrated Irradiance and radiation in wavelengths between 280 nm and 315 nm; and
the Spectral Distribution of Simulated Solar Radiation for
UV-C, radiation in wavelengths shorter than 280 nm.
5
Testing Purposes 3.1.5 fluorescent UV lamp—lamp in which radiation at 254
nm from a low-pressure mercury arc is transformed to longer
wavelength UV by a phosphor. The spectral energy distribution
1
This practice is under the jurisdiction of ASTM Committee G-3 on Durability
of a fluorescent UV lamp is determined by the emission
of Nonmetallic Materials, and is the direct responsibility of Subcommittee G03.03
spectrum of the phosphor and the UV transmission of the glass
on Simulated and Controlled Environmental Tests.
Current edition approved Jan. 10, 1996. Published April 1996. Originally
tube.
published as G 53 – 77. Last previous edition G 53 – 95.
2
Annual Book of ASTM Standards, Vol 14.03.
4. Summary of Practice
3
Annual Book of ASTM Standards, Vol 14.02.
4
4.1 Specimens are alternately exposed to ultraviolet light
Annual Book of ASTM Standards, Vol 06.01.
5
Available from Secretary, U.S. National Committee, CIE, National Institute of
alone and to condensation alone in a repetitive cycle.
Standards and Technology, Gaithersburg, MD 20899.
1

---------------------- Page: 1 ----------------------
G53
6
6.1.1 Type A : An exposure apparatus where the lamps shall
b
...

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4.2 Compressive properties include modulus of elasticity, yield stress, deformation beyond yield point, and compressive strength (unless the material merely flattens but does not fracture). Materials possessing a low order of ductility may not exhibit a yield point. In the case of a material that fails in compression by a shattering fracture, the compressive strength has a very definite value. In the case of a material that does not fail in compression by a shattering fracture, the compressive strength is an arbitrary one depending upon the degree of distortion that is regarded as indicating complete failure of the material. Many plastic materials will continue to deform in compression until a flat disk is produced, the compressive stress (nominal) rising steadily in the process, without any well-defined fracture occurring. Compressive strength can have no real meaning in such cases.  
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4.4 Before proceeding with this test method, reference should be made to the ASTM specification for the material being tested. Any test specimen preparation, conditioning, dimensions, and testing parameters covered in the materials specification shall take precedence over those mentioned in this test method. If there is no material specification, then the default conditions apply. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist.
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1.5 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.  
1.6 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. Specific precautionary statements are given in 1.3 and 1.4.
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