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Fire-Rated or Fire/Impact Safety-Rated Insulated Glass Units

FireLite® IGU is composed of FireLite products and tempered or annealed float glass with an insulating air space between the pieces of glass. *3 hour rated units must be specified with FireLite NT® or FireLite Plus®.



Now with ultraHD® Technology for improved color,clarity and surface quality
  • Available in two surface finishes for clear viewing,
    Premium Grade and Standard Grade
  • May be lightly sandblasted or etched on one side without affecting fire rating
  • Passes positive pressure test standards UL 10C, UBC 7-2 and UBC 7-4
  • 10 year limited warranty
  • Stainless steel spacers
  • Decorative films applied by SHT
  • Fire-rated for up to 3 hours with hose stream test
  • Clear and wireless
  • Impact safety-rated version meets ANSI Z97.1 and CPSC 16CFR1201 (Cat. I and II)
  • Large sizes available
  • Typical 1" thickness fits in Designer Series or Hardwood Series framing from SHT, or
    standard hollow metal frames
  • Available incorporating a variety of glass products, including (but not limited to):
    • Tinted
    • Low-E
    • Reflective
    • One-Way Mirror
    • Art


Classified and labeled by Underwriters Laboratories, Inc.® and Underwriters Laboratories of Canada. File number for labeled fire-rated assemblies is R13377. Tests performed in accordance with UL 9, UL 10B, UL 10C, ASTM E2074, CSFM 43.7, NFPA 80, NFPA 252, NFPA 257, UBC 43.2, UBC 43.4, UBC 7-2, UBC 7-4, CAN4 S-104 and CAN4 S-106. Approved for use in New York City: MEA 290-90-M-6. Approved for use in Los Angeles: LARR 25798.

Rating Assembly Max. Exposed Area (in2/ft2) Max. Width Of Exposed Glazing (in) Max. Height Of Exposed Glazing (in)
20-60 min. Doors (non-temp rise) 3,204/22.25 36 89
  Doors (temp rise) 100/0.69 12 33
  Other than doors 3,325/23.09 95 95
90 min. Doors (non-temp rise) 2,034/14.13 36 56-1/2"
  Doors (temp rise) 100/0.69 12 33
  Other than doors 2,627/18.24 56-1/2" 56-1/2"
3 hour Doors 100/0.69 12 33
Check with frame manufacturer for maximum tested glass sizes and required stop height.

Note: Individual lite sizes cannot exceed "Max. Exposed Area" shown above.

This information is intended for general reference only. For current listing details, please
call Technical Glass Products.


  • Exterior applications where energy codes require an insulated product
  • Interior applications with special needs such as sound reduction



Request a sample kit.

Surface Options

Because FireLite is made from transparent glass-ceramic, it differs in color from float glass. FireLite appears to have a warmer earth tone when compared to the blue green tint of typical float glass. However, like float glass, FireLite ceramic will not demonstrate a highly perceptible color once installed in a frame. Additionally, FireLite products are manufactured in three distinct surface grades (Premium, Standard and Obscure) that are best reviewed prior to specification. Please contact SHT at 800.426.0279 or to request a sample kit.

FireLite Standard Grade:
May have slight surface imperfections, which may become more apparent in larger sheet sizes. FireLite Standard Grade is comparable to alternative fire-rated ceramics that are marketed as having a “Premium” finish.
FireLite Premium Grade:
Both surfaces are polished to minimize distortion and provide superior surface quality. FireLite Premium Grade is the industry leader for quality and is unmatched by alternative products or production methods.
FireLite Obscure Grade:
The glass-ceramic features a patterned surface to allow more privacy.


Seal: Dual-seal polysulfide units with breather tubes
U-Value: Similar to standard insulating units with a make-up of:1/4" float glass - 1/2" air space - 1/4" float glassSummer U-Value: Approximately .55*Winter U-Value: Approximately .49*
STC Rating: 3/16" FireLite - 9/16" air space - 1/4" float glass = Approx. 35 dB** 3/16" FireLite NT - 9/16"air space - 1/4" float glass = Approx. 35 dB** 5/16" FireLite Plus - 9/16" air space - 1/4" float glass = Approx. 38 dB**

*U-values increase with use of high performance float glass producers.

**Values were achieved with these specific make ups.

Framing Options

Designer Series - 20/45/60/90 Minute Fire-Rated Doors & Frames
The Designer Series doors and frames incorporate precise European engineering, providing a sleek, modern alternative to traditional hollow metal frames.

Traditional Hollow Metal Steel Frames-Fire-Rated Doors & Frames
SHT glazing can be used in any approved fire-rated door and frame assemblies.


To maintain aesthetics, it is important to clean the glass during and after construction. For routine cleaning, use a soft, clean, grit-free cloth and a mild soap, detergent, or nonabrasive window cleaning solution.

Rinse immediately with clean water and remove any excess water from the glass surface with a squeegee. Do not allow any metal or hard parts of the cleaning equipment to contact the glass surface.