ASTM F2248-09

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:F2248–03 Designation:F2248–09
Standard Practice for
Specifying an Equivalent 3-Second Duration Design Loading
for Blast Resistant Glazing Fabricated with Laminated
1
Glass
This standard is issued under the fixed designation F2248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Historical records show that fragments from glazing that has failed as the result of intentional or
accidental explosions present a serious threat of personal injury. Glazing failure also allows blast
pressure to enter the interior of buildings thus resulting in additional threat of personal injury and
facility damage. This standard practice provides a means for designers to determine equivalent
3-second duration design loadings with which they can size blast resistant glazing comprised of
laminated glass or insulating glass fabricated with laminated glass, or both. Blast resistant glazing
systems of this genre can reduce the number and size of glass fragments in an explosion as well as
reducing greatly or eliminating blast pressure that enters buildings when an explosion occurs.
1. Scope
1.1 This practice sets forth a method to specify an equivalent 3-second design loading suitable to use with Practice E1300 to
select the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration.
1.2This practice applies to blast resistant glazing fabricated using laminated glass only, including single laminated glass and
insulating glass fabricated with laminated glass.
1.3This practice assumes that blast resistant glazing shall be adhered to its supporting frame using structural silicone sealant or
adhesive glazing tape. The width of the structural silicone sealant bead shall be at least equal to but not larger than two times the
thickness designation of the glass to which it adheres. The width of glazing tape shall be at least equal to two times but not more
than four times the thickness designation of the glass to which it adheres.
1.4This practice assumes the framing members shall restrict deflections of edges of blast resistant glazing they support to to
select the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration. Glass plies used to
construct laminated glass are recommended to be either annealed or heat strengthened glass.
1.2 This practice applies to blast resistant glazing fabricated using laminated glass only, including single laminated glass and
insulatingglassfabricatedwithlaminatedglass.Asaminimum,insulatingglassshalluselaminatedglassfortheinboard(protected
side) lite.
1.3 This practice assumes that blast resistant glazing shall be adhered to its supporting frame using structural silicone sealant
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or adhesive glazing tape. The width of the structural silicone sealant bead shall be at least equal to the larger of 10-mm ( ⁄8-in.)
or the thickness designation of the glass to which it adheres but not larger than two times the thickness designation of the glass
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to which it adheres.The minimum thickness of the structural silicone bead shall be 5-mm ( ⁄16-in.).The width of glazing tape shall
be at least equal to two times but not more than four times the thickness designation of the glass to which it adheres. The width
of silicone or glazing tape is referred to as bite and is shown and discussed in Guide C1564.
1.4 This practice assumes that the structural silicone bead or glazing tape is applied to both sides of single lite laminated glass
but need only be applied to the inboard side (protected side) of insulating glass.
1.5 Thispracticeassumestheframingmembersshallrestrictdeflectionsofedgesofblastresistantglazingtheysupportto L/160
under the equivalent 3-second duration design loading as determined herein, where /60 under 2.03 the load resistance of the blast
resistant glazing for inward loading, where L denotes the length of the supported edge.
1.5This practice assumes the framing system supporting the blast resistant glazing shall attach mechanically to the structural
1
This practice is under the jurisdiction ofASTM Committee F12 on Security Systems and Equipment and is the direct responsibility of Subcommittee F12.10 on Systems
Products and Services.
Current edition approved Aug. 10, 2003. Published Aug. 2003. DOI: 10.1520/F2248-03.
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