ASTM F2156 - 11

    Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope

    Active Standard ASTM F2156 | Developed by Subcommittee: F07.08

    Book of Standards Volume: 15.03


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    Significance and Use

    Transparent parts, such as aircraft windshields, canopies, cabin windows, and visors, shall be measured for compliance with optical distortion specifications using this test method. This test method is suitable for assessing optical distortion of transparent parts as it relates to the visual perception of distortion. It is not suitable for assessing distortion as it relates to pure angular deviation of light as it passes through the part. Either Test Method F801 or Practice F733 is appropriate and shall be used for this latter application. This test method is not recommended for raw material.

    1. Scope

    1.1 When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all transparencies but is especially critical to aerospace applications such as combat and commercial aircraft windscreens, canopies, or cabin windows. This is especially true during operations such as takeoff, landing, and aerial refueling. It is critical to be able to quantify optical distortion for procurement activities.

    1.2 This test method covers the apparatus and procedures that are suitable for measuring the grid line slope (GLS) of transparent parts, including those that are small or large, thin or thick, flat or curved, or already installed. This test method is not recommended for raw material.

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

    1.3.1 ExceptionThe values given in parentheses are for information only.

    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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    F733 Practice for Optical Distortion and Deviation of Transparent Parts Using the Double-Exposure Method

    F801 Test Method for Measuring Optical Angular Deviation of Transparent Parts


    ICS Code

    ICS Number Code 49.020 (Aircraft and space vehicles in general)

    UNSPSC Code

    UNSPSC Code 25202507(Aircraft windows); 25202508(Aircraft windshields)


    DOI: 10.1520/F2156-11

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