Practice for Operating Light-Exposure Apparatus (Xenon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials (Withdrawn 2000)

SCOPE
1.1 This practice covers the basic principles and operating procedure for water- or light-exposure apparatus, or both, employing a xenon-arc light source. Note 1-This practice combines the practices previously referred to as G26 and G27. Practice G27, for Operating Xenon-Arc Type Apparatus for Light Exposure of Nonmetallic Materials , has been discontinued since it is now covered in this edition of G26 under Test Methods C and D.
1.2 This practice does not specify the exposure conditions best suited for the material to be tested, but is limited to the method of obtaining, measuring, and controlling the conditions and procedures of the exposure. Sample preparation, test conditions, and evaluation of results are covered in ASTM methods or specifications for specific materials.  
1.3 This practice includes four test methods:  
1.3.1 Test Method 1 -Continuous exposure to light and intermittent exposure to water spray.  
1.3.2 Test Method 2 -Alternate exposure to light and darkness and intermittent exposure to water spray.  
1.3.3 Test Method 3 -Continuous exposure to light without water spray. Exposure conditions are characteristic of those specified by AATCC Test Method 16E 1976.  
1.3.4 Test Method 4 -Alternate exposure to light and darkness without water spray. Exposure conditions characteristic of those natural conditions experienced when exposing are in accordance with Practice G24.  
1.4 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents of the SI units may be approximate.  
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.

General Information

Status
Withdrawn
Publication Date
09-Jan-1996
Current Stage
Ref Project

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ASTM G26-96 - Practice for Operating Light-Exposure Apparatus (Xenon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials (Withdrawn 2000)
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Standards Content (Sample)

~ ~~ ~-
STD-ASTM G26-ENGL 2996 = 0759510 0611152 191 W
AMERICAN SOCIETY FOR TESTING AND MATERIALS
Designation: G 26 - 96
100 Barr Harbor Dr , West Conshohocken. PA 19428
4Tb Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Operating Light-Exposure Apparatus (Xenon-Arc Type) With
and Without Water for Exposure of Nonmetallic Materials’
This standard is issued under the fixed designation G 26; 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. Consult the DoD Index of Specijcations and
Standards for the specijic year of issue which has been adopted by the Department of Defense.
D 1293 Test Methods for pH of Water2
1. Scope
D 45 17 Test Method for Low-Level Total Silica in Hi&
1. I This practice covers the basic principles and operating
Punty Water by Flameless Atomic Absorption3
procedure for water- or light-exposure apparatus, or both,
69 1 Practice for Conducting an Interlaboratory Study to
E
employing a xenon-arc light source.
Determine the Precision of a Test Method4
NOTE 1-This practice combines the practices previously referred to
G 24 Practice for Conducting Natural Light E~~~~~~~~
as G26 and G 27. Practice G 27, for Operating Xenon-Arc Type
Under Glass5
Apparatus for Light Exposure of Nonmetallic Materials2, has been
2.2 AATCC Standard:
discontinued since it is now covered in this edition of G 26 under Test
Method 16 Colorfastness to Light6
Methods C and D.
2.3 CIE Standard:
i .2 This practice does not specify the exposure conditions
N~. 20 Recommendations for the Integrated Irradiance
best suited for the material to be tested, but is limited to the
and the Spectral Distribution of Simulated Solar Radia-
method of obtaining, measuring, and controlling the condi-
tion for Testing Purposes7
tions and procedures of the exposure. Sample preparation,
2.4 IS0 Standard:
test conditions, and evaluation of results are covered in
G~~~ Scale8
ASTM methods or specifications for specific materials.
1.3 This practice includes four test methods:
3. Significance and Use
1.3.1 Test Method I-Continuous exposure to light and
intermittent exposure to water spray.
3.1 Several types of apparatus with different exposure
1.3.2 Test Method 2-Alternate exposure to light and
conditions are available for use. No single operating proce-
darkness and intermittent exposure to water spray.
dure for light-exposure apparatus with and without water can
1.3.3 Test Method 3-Continuous exposure to light
be specified as a direct simulation of natural exposure. This
without water spray. Exposure conditions are characteristic
practice does not imply expressly or otherwise an accelerated
of those specified by AATCC Test Method 16E 1976.
weathering test.
1.3.4 Test Method 4-Altemate exposure to light and
3.2 Since the natural environment varies with respect to
darkness without water spray. Exposure conditions charac-
time, geography, and topography, it may be expected that the
teristic of those natural conditions experienced when ex-
effects of natural exposure will vary accordingly. All mate-
posing are in accordance with Practice G 24.
rials are not affected equally by the same environment.
1.4 The values stated in SI units are to be regarded as the
Results obtained by use of this practice should not be
standard. The inch-pound equivalents of the SI units may be
represented as equivalent to those of any natural weathering
approximate.
test until the degree of quantitative correlation has been
1.5 This standard does not purport to address all of the
established for the material in question.
safety concerns, if- any, associated with its use. It is the
3.3 Variations in results may be expected among instru-
responsibility of the user of this standard to establish appro-
ments of different types or when operating conditions among
priate safety and health practices and determine the applica-
similar type instruments vary within the accepted limits of
bility of regulatory limitations prior to use.
this practice. Therefore, no reference should be made to
results from use of this practice unless accompanied by the
1 or unless otherwise specified in a
report form shown in Fig.
2. Referenced Documents
referenced procedure.
2.1 ASTM Standard:
D 859 Test Methods for Silica in Water2
Annual Book of ASTM Siandards, Vol 1 1.02.
Annual Book of ASTM Standards, Vol 14.02.
5 Annual Book of ASTM Standards, Vol 06.0 I.
This practice is under the jurisdiction of ASTM Committee G-3 on Durability
ci Available from The Secretary, American Association of Textile Chemists and
of Nonmetallic Materials and is
...

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