ASTM F428-01

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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2001
• ICS: 49.045 - Structure and structure elements
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.08 - Transparent Enclosures and Materials

Relations

• Replaces: ASTM F428-83(1997)e2 - Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures
• Effective Date: 10-Nov-2001
• Replaced By: ASTM F428-03 - Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures
• Effective Date: 10-Nov-2001
• Referred By: ASTM F548-19 - Standard Test Method for Intensity of Scratches on Aerospace Transparent Plastics
• Effective Date: 10-Nov-2001
• Referred By: ASTM F790-23 - Standard Guide for Testing Materials for Aerospace Plastic Transparent Enclosures
• Effective Date: 10-Nov-2001

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 428 – 01
Standard Test Method for
1
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.
1. Scope The lightest scratch is identified as ASTM F 428-3 and the
3
heaviest as ASTM F 428-8.
1.1 This test method covers the visual inspection of
scratches on the glass surface of aerospace transparent enclo-
6. Procedure
sures.
6.1 Place the part in a suitable inspection position. This may
1.2 This standard may involve hazardous materials, opera-
be horizontal on a padded table, vertical against a neutral to
tions, and equipment. This standard does not purport to
dark background, or at an angle simulating the installed
address all of the safety concerns, if any, associated with its
position. The scratched surface shall be toward the observer.
use. It is the responsibility of the user of this standard to
The light level shall be a minimum of 80 lux. Either natural or
establish appropriate safety and health practices and deter-
artificial light may be used. If possible, move the light until the
mine the applicability of regulatory limitations prior to use.
scratch has the highest contrast against the background. Place
2. Referenced Documents the scratch in the visual comparison standard beside and
parallel to the scratch in question. Rotate the part or viewing
2.1 Other Standards:
2 angle to get the best definition of the scratch. Disregarding the
Glass Scratch Visual Comparison Standard
length of the scratch on the part and on the standard, select and
3. Summary of Test Method record the standard that most closely matches the appearance
of the scratch on the part. Measure and record the length of the
3.1 A visual comparison is made between a set of graded
scratch to the nearest 1 mm (or 0.05 in.).
scratch standards and the scratch on the glass aerospace
transparency to determine the relative intensity of the scratch.
7. Interpretation
4. Significance and Use 7.1 Customer specifications for aerospace glass surfaced
transparent enclosures may detail allowable frequency, loca-
4.1 Scratches exist on all glass surfaces. Often there are very
tion, length, and standard number for scratches and they may
fine scratches from cleaning operations that are not visible
assign maximum scratch limits for critical and noncritical
when looking through the glass. Visible scratches may be
optical viewing areas.
distracting to the observer looking through the enclosure.
Therefore, a procedure to define scratches is useful. A visual
8. Report
standard is used because it is not practical to measure the
8.1 For each scratch within the scope of the glass scratch
dimensions of the fine scratches in the scope of this test
standard, report its standard number, length, frequency, and
method.
location.
5. Reference Materia
...