ASTM E2649 - 12

    Standard Test Method for Determining Argon Concentration in Sealed Insulating Glass Units Using Spark Emission Spectroscopy

    Active Standard ASTM E2649 | Developed by Subcommittee: E06.22

    Book of Standards Volume: 04.12


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    ASTM E2649

    Significance and Use

    This test method is intended to provide a means for determining the concentration of argon in sealed insulating glass units under controlled conditions in compliance with the apparatus manufacturer's instructions.

    This is a non-destructive test method in that the edge seal of the test specimen is not breached in order to determine the argon gas concentration. However, damage to some glass coatings on the inner surfaces of the glass can occur.

    This test method has been developed based on data collected in a controlled laboratory environment.

    The device shall be used to determine the argon gas concentration in insulating glass units in a controlled laboratory environment. Refer to 12.3.

    This test method may be used to determine the argon gas concentration before, during, or after the insulating glass unit is subjected to durability tests.

    The accuracy of the test method is dependent upon the accuracy of the Spark Emission Spectroscope. When the concentration of the argon being measured is below certain levels, this test method is not applicable. See the spectroscope manufacturers literature for recommended levels of accuracy of a given model.

    1. Scope

    1.1 This test method covers procedures for using a spark emission spectroscope to determine the concentration of argon gas in the space between the lites of a sealed insulating glass unit.

    1.2 This is a non-destructive test method.

    1.3 This test method shall be used only in a controlled laboratory environment.

    1.4 This test method is applicable for insulating glass units where argon has been added to the sealed insulating glass cavity and the balance of the gas is atmospheric air.

    1.5 This test method is applicable for clear, double-glazed insulating glass units.

    1.6 This test method is applicable for double-glazed insulating glass units with one lite having a metallic coating or tinted glass, or both, and with clear glass as the other lite.

    1.7 This test method is applicable for triple-glazed insulating glass units only when the center lite of glass has a metallic coating (either low emissivity (low E) or reflective) and both of the other lites are clear glass.

    1.8 This test method also includes a procedure for verifying the accuracy of the readings of the test apparatus.

    1.9 The values stated in SI units are to be regarded as the standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

    1.10 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. For specific warning statements, refer to 7.1.


    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

    C717 Terminology of Building Seals and Sealants

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

    E631 Terminology of Building Constructions

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

    E2190 Specification for Insulating Glass Unit Performance and Evaluation


    ICS Code

    ICS Number Code 71.040.50 (Physicochemical methods of analysis)

    UNSPSC Code

    UNSPSC Code 30171710(Insulating glass); 41115400(Spectroscopic equipment)


    DOI: 10.1520/E2649-12

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