New ASTM Insulating Glass Units Standard Contributes
to Testing for Energy Efficiency of Windows
July 20, 2009
ASTM International has published a new standard that provides a
method for evaluating gas concentration inside insulating glass
units without destroying or altering the edge seal. Subcommittee
E06.22 on Durability Performance of Building Constructions, part
of ASTM International Committee E06 on Performance of Buildings,
developed the new standard, ASTM E2649, Test Method for Determining
Argon Concentration in Sealed Insulating Glass Units Using Spark
"The inert gases that are often contained between the panes
of glass that make up an insulating glass unit provide better thermal
efficiency and reduce heat loss through the window," says Jeffery
Haberer, technical services engineer, Cardinal Glass Industries,
and E06.22.05 task group chair. "While the inert gas is only
one component of a window that reduces heat loss, if the inert gas
leaks out, the total potential to reduce heat loss is compromised."
Haberer says that, for a test on gas loss, it is necessary to know
the concentration prior to weather cycling and after.
"Previously, IG units were either altered with a septum for
gas sampling or the edge seal of the IG was destructively broken
in order to sample the gas content," says Haberer. "Until
now, there was no nondestructive test method to sample gas concentrations
in IG units." According to Haberer, certification groups and
researchers will use ASTM E2649 to show the compliance of an IG
unit to hold gas at a minimum accepted level.
HERE for more information on ASTM International committee E06.
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