ASTM F548-09(2014)
(Test Method)Standard Test Method for Intensity of Scratches on Aerospace Transparent Plastics
Standard Test Method for Intensity of Scratches on Aerospace Transparent Plastics
SIGNIFICANCE AND USE
4.1 Scratches exist on all transparent plastic surfaces. Usually they are very fine scratches from cleaning operations that are not visible when looking through the plastic. Deeper scratches may result from careless cleaning or handling. While these may not be deep enough to affect the structural integrity of the part, their appearance in certain locations may be distracting to the observer looking through the plastic. Therefore, a procedure to define these scratches is useful.
SCOPE
1.1 This test method covers the visual inspection of shallow or superficial scratches on the surface of aerospace transparent plastic materials.
1.2 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
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F548 − 09 (Reapproved 2014)
Standard Test Method for
Intensity of Scratches on Aerospace Transparent Plastics
ThisstandardisissuedunderthefixeddesignationF548;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 6. Procedure
1.1 This test method covers the visual inspection of shallow 6.1 Place the part in a suitable inspection position.This may
or superficial scratches on the surface of aerospace transparent be horizontal on a padded table, vertical against a neutral
plastic materials. background, or at an angle. The scratched surface shall be
toward the observer. The light level shall be a minimum of 80
1.2 This standard does not purport to address all of the
lux. Either natural or artificial light may be used. Place the
safety concerns, if any, associated with its use. It is the
scratch in the ASTM comparison standard beside and parallel
responsibility of the user of this standard to establish appro-
to the scratch to be assessed on the plastic material. Rotate the
priate safety and health practices and determine the applica-
part or viewing angle to get the best definition of the scratch.
bility of regulatory limitations prior to use.
Disregarding the length of the scratch on the plastic material
2. Referenced Documents
and on the standard, select and record the highest-numbered
2 standard scratch that most clearly matches the appearance of
2.1 ASTM Standards:
the scratch on the plastic material. Measure and record the
F428 Test Method for Intensity of Scratches on Aerospace
length of the scratch to the nearest 1 mm (0.04 in.).
Glass Enclosures
7. Interpretation
3. Summary of Test Method
7.1 Customer specifications for transparent plastic materials
3.1 A visual comparison is made between a set of graded
and parts may detail allowable frequency, location, length, and
scratch standards and the scratch on the plastic material to
standard number for scratches and they may assign maximum
determine the relative intensity of the scratch.
scratch limits for critical and noncritical optical viewing areas.
4. Significance and Use
8. Report
4.1 Scratches exist on all transparent plastic surfaces. Usu-
8.1 For each scratch within the scope of the plastic scratch
ally they are very fine scratches from cleaning operations that
standard, report its ASTM standard number (for example,
are not visible when looking through the plastic. Deeper
ASTM F548-09), length, frequency, and location.
scratches may result from careless cleaning or handling. While
these may not be deep enough to affect the structural integrity
9. Precision and Bias
of the part, their appearance in certain locations may be
9.1 Precision:
distracting to the observer looking through the plastic.
9.1.1 The repeatability of judging the intensity of a scratch
Therefore, a procedure to define these scratches is useful.
within one scratch value, for the same observer, is 92 % or
5. Reference Materials
better.
NOTE 1—Adjuncts for scratches on plastic are not currently available.
9.1.2 The reproducibility (between observers) of judging
However,adjunctsareavailableforscratchesonglasssurfacesandastudy
the intensity of a scratch within one scratch value is 90 % or
has been done to equate the two (see the Appendix). Refer to F428 for
better for scratch values 14 and above. The reproducibility of
sources of the glass adjuncts.
judging the intensity of a scratch within two scratch values is
92 %orbetterforscratchvaluesbelow14.Thedatareflectthat
This test method is under the jurisdiction of ASTM Committee F07 on
it is more difficult to judge finer scratches.
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 on
Transparent Enclosures and Materials.
9.2 Bias—The pro
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F548 − 09 F548 − 09 (Reapproved 2014)
Standard Test Method for
Intensity of Scratches on Aerospace Transparent Plastics
This standard is issued under the fixed designation F548; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the visual inspection of shallow or superficial scratches on the surface of aerospace transparent
plastic materials.
1.2 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.
2. Referenced Documents
2.1 ASTM Standards:
F428 Test Method for Intensity of Scratches on Aerospace Glass Enclosures
3. Summary of Test Method
3.1 A visual comparison is made between a set of graded scratch standards and the scratch on the plastic material to determine
the relative intensity of the scratch.
4. Significance and Use
4.1 Scratches exist on all transparent plastic surfaces. Usually they are very fine scratches from cleaning operations that are not
visible when looking through the plastic. Deeper scratches may result from careless cleaning or handling. While these may not be
deep enough to affect the structural integrity of the part, their appearance in certain locations may be distracting to the observer
looking through the plastic. Therefore, a procedure to define these scratches is useful.
5. Reference Materials
NOTE 1—Adjuncts for scratches on plastic are not currently available. However, adjuncts are available for scratches on glass surfaces and a study has
been done to equate the two (see the Appendix). Refer to F428 for sources of the glass adjuncts.
6. Procedure
6.1 Place the part in a suitable inspection position. This may be horizontal on a padded table, vertical against a neutral
background, or at an angle. The scratched surface shall be toward the observer. The light level shall be a minimum of 80 lux. Either
natural or artificial light may be used. Place the scratch in the ASTM comparison standard beside and parallel to the scratch to be
assessed on the plastic material. Rotate the part or viewing angle to get the best definition of the scratch. Disregarding the length
of the scratch on the plastic material and on the standard, select and record the highest-numbered standard scratch that most clearly
matches the appearance of the scratch on the plastic material. Measure and record the length of the scratch to the nearest 1 mm
(0.04 in.).
7. Interpretation
7.1 Customer specifications for transparent plastic materials and parts may detail allowable frequency, location, length, and
standard number for scratches and they may assign maximum scratch limits for critical and noncritical optical viewing areas.
This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
Enclosures and Materials.
Current edition approved May 15, 2009Dec. 1, 2014. Published June 2009December 2014. Originally published in 1981. Last previous edition approved in 20032009 as
ε1
F548 – 03aF548 – 09. . DOI: 10.1520/F0548-09.10.1520/F0548-09R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.