ASTM C1652 / C1652M - 14

    Standard Test Method for Measuring Optical Distortion in Flat Glass Products Using Digital Photography of Grids

    Active Standard ASTM C1652 / C1652M | Developed by Subcommittee: C14.11

    Book of Standards Volume: 15.02


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    Significance and Use

    5.1 This test method provides accurate data for evaluation of the optical properties of the glass being inspected.

    5.2 The procedure described is useful for measuring the roll wave introduced during the tempering process of flat architectural glass. (1)

    5.3  This test method is also useful for inspection of laminated and tempered automotive glass in transmitted light, in both flat and curved geometries.

    1. Scope

    1.1 This test method covers the determination of optical distortion of heat-strengthened and fully tempered architectural glass substrates which have been processed in a heat controlled continuous or oscillating conveyance oven. See Specifications C1036 and C1048 for discussion of the characteristics of glass so processed. In this test method the reflected image of processed glass is photographed and the photographic image analyzed to quantify the distortion due to surface waviness. The test method is also useful to quantify optical distortion observed in transmitted light in laminated glass assemblies.

    1.2 The values stated in either SI units or inch-pound units are regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

    1.3 There is no known ISO equivalent to 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 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

    C162 Terminology of Glass and Glass Products

    C1036 Specification for Flat Glass

    C1048 Specification for Heat-Strengthened and Fully Tempered Flat Glass

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


    ICS Code

    ICS Number Code 81.040.20 (Glass in building)

    UNSPSC Code

    UNSPSC Code 30171700(Glass products)


    DOI: 10.1520/C1652_C1652M-14

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