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ASTM F319-19

Current Revision

Standard Practice for Polarized Light Detection of Flaws in Aerospace Transparency Heating Elements

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1.1 This practice covers a standard procedure for detecting flaws in the conductive coating (heater element) by the observation of polarized light patterns.

1.2 This practice applies to coatings on surfaces of monolithic transparencies as well as to coatings imbedded in laminated structures.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 6.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 This practice is useful as a screening basis for acceptance or rejection of transparencies during manufacturing so that units with identifiable flaws will not be carried to final inspection for rejection at that time.

4.2 This practice may also be employed as a go-no go technique for acceptance or rejection of the finished product.

4.3 This practice is simple, inexpensive, and effective. Flaws identified by this practice, as with other optical methods, are limited to those that produce temperature gradients when electrically powered. Any other type of flaw, such as minor scratches parallel to the direction of electrical flow, are not detectable.

SDO ASTM: ASTM International
Document Number F319
Publication Date Nov. 1, 2019
Language en - English
Page Count 4
Revision Level 19
Supercedes
Committee F07.08
Publish Date Document Id Type View
Nov. 1, 2019 F0319-19 Revision
May 15, 2009 F0319-09 Revision
May 1, 2024 F0319-19R24 Reaffirmation
Dec. 1, 2014 F0319-09R14 Reaffirmation
Oct. 1, 2003 F0319-91AR03 Reaffirmation
Jan. 1, 1997 F0319-91AR97E01 Reaffirmation