ASTM F428-83(1997)e2
(Test Method)Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures
Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures
SCOPE
1.1 This test method covers the visual inspection of scratches on the glass surface of aerospace transparent enclosures.
1.2 This standard may involve hazardous materials, operations, and equipment. 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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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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e2
Designation: F 428 – 83 (Reapproved 1997)
Standard Test Method for
Intensity of Scratches on Aerospace Glass Enclosures
This standard is issued under the fixed designation F 428; 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.
e NOTE—Sections 9 and 10 were added editorially in April 1997.
e NOTE—Note 1 was added editorially in July 2001.
1. Scope 428-2 and the heaviest as ASTM F 428-8.
1.1 This test method covers the visual inspection of
NOTE 1—The Glass Scratch Visual Comparison Standard is being
scratches on the glass surface of aerospace transparent enclo- revised and is currently not available as an adjunct.
sures.
6. Procedure
1.2 This standard may involve hazardous materials, opera-
6.1 Place the part in a suitable inspection position. This may
tions, and equipment. This standard does not purport to
address all of the safety concerns, if any, associated with its be horizontal on a padded table, vertical against a neutral
background, or at an angle simulating the installed position.
use. It is the responsibility of the user of this standard to
establish appropriate safety and health practices and deter- The scratched surface shall be toward the observer. The light
level shall be a minimum of 80 lumens. Either natural or
mine the applicability of regulatory limitations prior to use.
artificial light may be used. Place the scratch in the visual
2. Referenced Documents
comparison standard beside and parallel to the scratch in
2.1 ASTM Adjuncts: question. Rotate the part or viewing angle to get the best
Scratch Test Standard (Glass) Adjunct F 428 definition of the scratch. Disregarding the length of the scratch
on the part and on the standard, select and record the standard
3. Summary of Test Method
that most closely matches the appearance of the scratch on the
3.1 A visual comparison is made between a set of graded
part. Measure and record the length of the scratch to the nearest
scratch standards and the scratch on the glass aerospace 1 mm (or 0.05 in.).
transparency to determine the relative intensity of the scratch.
7. Interpretation
4. Significance and Use
7.1 Customer specifications for aerospace glass surfaced
4.1 Scratches exist on all glass surfaces. Usually they are
transparent enclosures may detail allowable frequency, loca-
very fine scratches from cleaning operations that are not visible tion, length, and standard number for scratches and they may
when looking through the glass. Visible scratches may be
assign maximum scratch limits for critical and noncritical
distracting to the observer looking through the enclosure.
optical viewing areas.
There
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