ASTM F548-09
(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
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.
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Designation: F548 − 09
StandardTest Method for
1
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
3
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
1
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 procedure in this test method has no bias
Current edition approved May 15, 2009. Published June 2009. Originally
because the scratch intensity is defined only in terms of the test
´1
published in 1981. Last previous edition approved in 2003 as F548 – 03a . DOI:
method.
10.1520/F0548-09.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Aresearch report is available fromASTM International Headquarters. Request
the ASTM website. RR:F07-1007.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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F548 − 09
10. Keywords
10.1 comparison standard; scratches; transparent plastic
APPENDIX
(Nonmandatory Info
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
´1
Designation:F548–03a Designation:F548–09
Standard Test Method for
1
Intensity of Scratches on Aerospace Transparent Plastics
This standard is issued under the fixed designation F 548; 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
´ NOTE—Section 4 was editorially corrected in August 2005.
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. Summary of Test Method
2.1A 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. Referenced Documents
2
2.1 ASTM Standards:
F 428 Test Method for Intensity of Scratches on Aerospace Glass Enclosures
3. Significance and Use
3.1Scratches 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. Summary of Test Method
3.1 Avisual 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
NOTE1—Adjuncts are not currently available.
5.Procedure
5.1Place the part in a suitable inspection position. This may be horizontal on a padded table, vertical against a neutral
background,oratanangle.Thescratchedsurfaceshallbetowardtheobserver.Thelightlevelshallbeaminimumof80lux.Either
natural or artificial light may be used. Place the scratch in the visual comparison standard beside and parallel to the scratch 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 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.). 1—Adjuncts
1
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 . Published November 2003. Originally published in 1981. Last previous edition approved in 2003 as F548–03.
´1
Current edition approved May 15, 2009. Published June 2009. Originally published in 1981. Last previous edition approved in 2003 as F 548 – 03a .
2
A research report is available from ASTM International Headquarters. Request RR:F07-1007.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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.
1
---------------------- Page: 1 ----------------------
F548–09
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 F 428 for sources of the glass adjuncts.
6. Int
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