ASTM E2649-20,Standard Test Method for Determining Argon Concentration in Sealed Insulating Glass Units Using Spark Emission Spectroscopy.
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ASTM E2649-20 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.
Referenced Documents
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method.
3. Terminology
3. 1 Definitions: For definitions of terms found in this test method refer to Terminologies C162, C717, and E631.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 sealed insulating glass unitan assembled unit, comprising sealed lites of glass separated by dehydrated space(s),normally intended for clear vision areas of buildings.
4. Summary of Test Method
4.1 The spark emission spectroscope is placed against the glass surface of a sealed insulating glass unit in a prescribed manner.A high voltage, at low current, is applied to the glass surface. This voltage creates a spark which induces a plasma from the gas molecules inside the test specimen.
This causes light emissions (photons) of characteristic wavelengths. The instrument then collects the photons and analyzes them by spark emission spectroscopy. The resulting spectrum is compared to calibration data internal to the instrument to determine the concentration of argon inside the unit.