ASTM E2649-20 PDF

Full title and description

ASTM E2649-20 — Standard Test Method for Determining Argon Concentration in Sealed Insulating Glass Units Using Spark Emission Spectroscopy. This procedure describes the use of a spark emission spectroscope (SES) to measure argon concentration in the sealed cavity of insulating glass units (IGUs) as a non-destructive, laboratory-based test, including verification steps and limitations related to coatings and low-concentration ranges.

Abstract

ASTM E2649-20 specifies a controlled, non‑destructive test method using spark emission spectroscopy to determine the percent argon in the gas fill of sealed insulating glass units (double- and certain triple-glazed constructions). The method includes instrument verification, test procedures for clear and coated lites, applicability limits, and notes on potential coating damage and minimum applicable argon levels.

General information

• Status: Active standard (current edition E2649-20).
• Publication date: 2020 (E2649-20; released February 2020).
• Publisher: ASTM International (ASTM).
• ICS / categories: Physicochemical methods of analysis — ICS 71.040.50 (methods for gas/chemical analysis).
• Edition / version: E2649-20 (current edition).
• Number of pages: 8 pages (typical published length for E2649-20).

Scope

This test method covers procedures for using a spark emission spectroscope to determine argon concentration in the space between lites of sealed insulating glass units. It is intended as a non‑destructive laboratory method applicable to clear double-glazed IGUs, certain coated/tinted double-glazed units, and some triple‑glazed constructions where the center lite has a metallic coating; the method also contains procedures for verifying instrument accuracy and notes on applicability limits. The method is to be used in a controlled laboratory environment and does not address all possible safety concerns associated with its use.

Key topics and requirements

• Principle: measurement of argon concentration using spark emission spectroscopy (SES) on IGU exterior without breaching the edge seal.
• Applicability: clear double-glazed units; units with one coated/tinted lite paired with a clear lite; certain triple-glazed configurations with a coated center lite.
• Non‑destructive intent: test does not intentionally breach the IGU edge seal, though some inner-surface coatings can be damaged by the spark process.
• Instrument verification: procedures for verifying SES instrument accuracy and limits of applicability are included; accuracy is dependent on the spectroscope model and concentration range.
• Limitations: reduced accuracy at low argon concentrations and potential coating damage; method intended for laboratory conditions only.
• Significance and use: intended for product development, quality control, and verification of argon fill in IGUs before/during/after durability testing.

Typical use and users

Typical users include IGU manufacturers, independent testing laboratories, building-envelope consultants, façade engineers, research organizations, and quality/acceptance teams who need to verify argon fill levels or confirm gas‑fill retention after accelerated aging or field service. The method is used for QA/QC, research, and compliance checks tied to IGU performance specifications.

Related standards

ASTM E2649-20 is used alongside other IGU performance and test standards such as ASTM E2190 (Specification for Insulating Glass Unit Performance and Evaluation), ASTM E2188 (test methods for insulating glass unit durability/performance), and ASTM E2189 (resistance to fogging tests). E2649-20 replaces earlier E2649 editions (for example E2649-12 / E2649-09); an interlaboratory research report (RR:E06-1003) and work items addressing revision/verification have also been published.

Keywords

argon concentration, insulating glass unit (IGU), argon fill, spark emission spectroscopy (SES), gas fill verification, non-destructive test, IGU QA/QC, E06.22, insulating glass, argon retention.

FAQ

Q: What is this standard?

A: ASTM E2649-20 is a Standard Test Method that defines how to determine argon concentration inside sealed insulating glass units using spark emission spectroscopy in a controlled laboratory, non‑destructive test.

Q: What does it cover?

A: It covers SES measurement procedures, instrument verification, the types of IGU constructions to which the method applies (clear double-glazed, certain coated/tinted configurations, and specified triple-glazed cases), limitations on accuracy at low argon levels, and safety/usage notes.

Q: Who typically uses it?

A: IGU manufacturers, independent test labs, façade/building-envelope consultants, R&D groups, and QA/QC personnel who need to verify argon fill or confirm retention after conditioning or durability testing.

Q: Is it current or superseded?

A: The E2649-20 edition is the current published edition (2020). There have been follow-up work items to revise or update verification sections (work item WK83649), so users should check for any active revision work or newer editions before relying on the method for regulatory or contractual requirements.

Q: Is it part of a series?

A: It is part of the suite of ASTM E06 committee standards covering insulating glass unit performance and evaluation (subcommittee E06.22 covers IGU durability and related tests). E2649 is commonly referenced with E2188, E2189, and E2190 for comprehensive IGU testing and qualification.

Q: What are the key keywords?

A: Argon, IGU, insulating glass unit, spark emission spectroscopy, SES, gas fill concentration, non‑destructive testing, argon retention.