TGP Fireglass20 1/4″ Clear Tempered Fire-Rated Safety Glass, 20-Minute UL Labeled

Usually Ships: 3-5 Business Days
  • 1/4″ Thick Clear Tempered Fire-Rated Glass
  • Safety Glazing Material – CAT II Impact-Rated
  • 20-Minute Fire-Rated – Etched UL Classification

Available Options:


TGP Fireglass®20 – 20-Minute Fire Protective 1/4″ Thick Tempered Glass for Doors

Fireglass®20 is a 1/4″ (6 mm) thick fire-rated and impact safety-rated glazing material. It is listed for use in doors with a fire rating requirement of 20 minutes.

  • Fire-rated for up to 20 minutes
  • Impact safety-rated – ANSI Z97.1 and CPSC 16CFR1201 (Cat. I and II)
  • Tempered (at least 4 times stronger than wired glass)
  • Clear and wireless
  • For use in interior and exterior applications

Note: This product is not a barrier to radiant heat. This product does not meet test standards ASTM E119 or UL 263.

Classified and labeled by Underwriters Laboratories, Inc.®. File number for labeled 20 minute fire-rated assemblies is R13377. Tests performed in accordance with:UL 9, UL 10B, UL 10C, NFPA 80, NFPA 252, LARR 25798. All listing information is subject to change.

Labeling: Each piece of Fireglass20 shall be permanently labeled with the appropriate marking

Please refer to IBC code Chapter 7 (International Building Code) for fire-rated glass requirements and limitations. Frame, door, and/or hardware must also be fire-rated. Fire-rating requirements must match the glazing requirements in order for the assembly to fully meet code requirements. Please refer to manufacturers’ specifications. Please Consult with your door and frame manufacturer’s procedures, for their maximum glass size tested. Interpretation of building and fire codes may vary. Consult with the local authority having jurisdiction to determine appropriate standards in your area. Trudoor assumes no liability or responsibility for any damage to person or property resulting from or incident to the use of the products that we provide. Trudoor assumes no liability or responsibility for misspecified and/or misordered materials. Glass is made to order and non-returnable or refundable.

Fireglass®20 is a trademark of Techincal Glass Products, Inc.

Glass is non-returnable or refundable.



Architectural Applications – Door Vision Lites

Glass Thickness


Glass Impact Safety Rating

ANSI Z97.1 and CPSC 16CFR1201 (Cat. I and II)

Classification (Fire-Rating)

20-Minute UL Label

Glass Fire-Rating

Fire-rated for up to 20 minutes, UL Classified & Labeled. Without hose stream test.

Glass Appearance


Glass Light Transmission

Approx. 89%

Glass Weight

3 lb / ft

Glass Approvals

ANSI Z97.1 and CPSC 16 CFR1201 (Cat I and II), ANSI/UL10B, ANSI/UL10C

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TGP Fireglass20 1/4″ Clear Tempered Fire-Rated Safety Glass, 20-Minute UL Labeled