Requirements of Substituting Glass Panels In Insulating Glass Systems

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ASTM 1996-17 Regarding Glass Substitution

Section A1.8 states: “A1.8.1.1 The impact resisting lite (monolithic or laminated) of an insulating glass unit shall be composed of the same glass type and treatment with equal thickness or thicknesses of glass, and thicker or equal interlayer of the same manufacturer and type as originally tested and approved.

Section A1.8 states: “A1.8.1.5 Glazing systems typically have a stationary glazing stop that is a permanent part of the frame or sash, or a removable glazing stop (also referred to as a glazing bead), or both. If a removable stop is used, a system can be tested with this stop removed, if it considered to be non-structural and unnecessary to pass the required test.”

Section A1.8 states: “A1.8.2 Systems Tested with a Removable Glazing Stop or Bead in Place.


Section A1.8 states: “A1.8.2.1 Any substitution to an insulating glass unit from a single glazing (monolithic or laminated glass) shall require the testing of one additional specimen provided the system meets all the preconditions in A1.8.1.

Note:  This is assumed no additional testing is performed.  ASTM provisions permit one additional sample can be tested to substitute spacers or glass.  Contact Engineering Express to further discuss how we can develop a test protocol for your glazing system or provide a review & approval of glass or spacing substitution.

See also ASTM requirements for glass spacers

Last Update: February 19, 2022  

March 17, 2021  Codes & Standards, Engineering  
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