draft philippine national standard dpns 2100 2013 specification for insulating glass unit performance and evaluation ics 81.040.20 alignleft this specification covers preassembled permanently sealed insulating glass units with one or two airspaces and preassembled insulating glass units with capillary tubes intentionally left open. alignleft this is applicable only to sealed insulating glass units that are constructed with glass. alignleft applicable to both double-glazed and triple-glazed insulating glass units for triple-glazed insulating glass units where both of the outer lites are glass and inner lite is either glass or a suspended film. alignleft the qualification of test specimens is based on frost dew point and on the absence of fog after the specified test durations. alignleft the qualification of argon gas filled test specimens is based on the qualifications in 1.3 and maintaining the specified argon gas amounts before and after testing to test method e2188. alignleft qualification under this specification is intended to provide a basis for evaluating the durability of sealed insulating glass units. alignleft this specification is not applicable to sealed insulating glass units containing a spandrel glass coating due to test method limitations and this does not cover other physical requirements such as appearance thermophysical properties heat and light transmission and glass displacement. alignleft note 1sealed insulating glass units qualified according to this specification are alignleft not necessarily suitable for structurally glazed applications. factors such as sealant alignleft longevity when exposed to long term ultraviolet light and the structural properties of alignleft the sealant must be reviewed for these applications. for more information on the alignleft requirements for structural sealant glazing applications refer to specification c1369 alignleft guide c1249 and test method c1265. alignleft the values stated in si units are to be regarded as standard. no other units of alignleft measurement are included in this standard. alignleft 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.