ASTM G45-75

Recommended Practice for Specifying Limits for Fading and Discoloration of Nonmetallic Materials (Withdrawn 1981)

General Information

• Status: Withdrawn
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.03 - Simulated and Controlled Exposure Tests

Standards Content (Sample)

~~J~ Designation: G 45 - 75
AMERICAN SOCIETY FOR TESTING AND MATERIALS
1916 Race St., Phlladelphla, Pa., 19103
Reprinted from the Annual Book of ASTM Standards, Copyright ASTM
If not listed in the current combined Index. will appear in the next edition.
Standard Recommended Practice for
SPECIFYING LIMITS FOR FADING AND
1
DISCOLORATION OF NONMETALLIC MATERIALS
This Standard is issued under the fixed designation G 45; 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. ·
1. Scope 3. Summary
1.1 This recommended practice estab­ 3.1 This recommended practice estab­
lishes a procedure and limits for the follow­ lishes three levels of fading or discoloration:
ing:
End Point Level I, End Point Level II, and
1.1. l Defining fading or discoloration per­ End Point Level III. It permits these end
formance criteria for inclusion in perform­ points to be determined by one of three nonin­
ance specifications. terchangeable alternative methods, one in­
1.1.2 Demonstrating substantial compli­ strumental, and two visual.
ance with such performance. Specification 3.2 This recommended practice indicates
for the product being offered. how to specify the desired level.
1.2 This recommended practice is applica­
4. Significance
ble to like or unlike, opaque, nonmetallic
materials tested under identical procedures 4.1 This recommended practice provides
without regard to the causes of, or the means an alternative technique for reporting color
by which fading and discoloration are
change whereby the exposure measure, usu­
brought about. ally time, becomes the dependent variable
1.3 This recommended practice does not and the amount of change, expressed quanti­
specify the materials to be evaluated, the tatively, becomes an independent variable.
conditions to which the materials are ex­ 4. 2 It is particularly applicable for compar­
posed, nor the test procedures to be used. ing changes undergone by dissimilar mate­
rials during natural and artificial weathering,
Sample preparation, test conditions, and eval­
uation of other performance characteristics fade testing, and other procedures which
bring about changes in color.
are covered in the ASTM methods or specifi­
4.3 Selection of Method I (Instrumental),
cations designated, or in the nonstandard
tests detailed in the performance specifica­ Method II (ISO Gray Scale), or Method III
(Munsell Gray Scale) shall be at the discre­
tion.
tion of the testing facility unless the govern-
2. Applicable Documents
1
This recommended practice is under the jurisdiction
of ASTM Committee G-3 on Deterioration of Nonmetallic
2.1 ASTM Standards:
Materials, and is the direct responsibility of Subcommittee
D 2244 Instrumental Evaluation of Color
003.03 on Simulated and Controlled Environmental Tests.
2 Current edition approved Oct. 31, 1975. Published De-
Differences of Opaque Materials
cember 1975.
D 2616 Evaluating Change in Color with a • Annual Book of ASTM Standards, Parts 27 and 46.
3
Annual Book of ASTM Standards, Part 27.
3
Gray Scale
• Available from American National Standards Insti­
2.2 ISO Recommendations: tute, 1430 Broadway, New York, N.Y. 10018. Scales with
instructions for use may be obtained from the Secretary,
R 105/1 Tests for Color Fastness of Tex­
American Association of Textile Chemists and Colorists,
4
tiles, First Series
Box 12215, Research Tnangle Park, N.C. 27709.

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G4S
ing periodically to measure the amount of
ing performance specification designates only
one acceptable method of evaluation. Method fading or discoloration that has occurred,
I is to be preferred because it does not re­ then continue testing until the desired end
quire, directly or by inference, personnel point level is achieved.
assigned to evaluation who are known to be 6.1.1 Prepare one additional specimen for
free of color vision anomalies or to possess each product tested. Set the specimen aside,
a given level of color aptitude. isolated from light or other deteriorating
agents, and use as the reference specimen
S. Definitions
during color comparisons.
6.2 End Points:
5.1 performance characteristic-the re­
sponse of a given material or product to a 6.2.1 Three commercially significant per­
formance levels are given for each method in
specified test method, usually stated in quan­
titative terms. 6.3. The absolute values for the levels indi­
5.2 performance criterion-the minimum cated for any one method are not mathemati­
acceptable performance characteristic for a
cally equivalent to the levels given for the
given property as stated in quantitative terms other methods, but represent only similar de­
grees of fading or color change.
in a performance specification.
6.2.2 The user shall determine the end
NOTE I-Performance characteri
...