Fire-rated glass and framing products from Technical Glass Products (TGP)


Fire-rated glass and framing products from Technical Glass Products (TGP)
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Fire-Rated, Safety-Rated Glass

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

20 Minutes

Fire-rated Impact-rated Positive Pressure UL Listed and Labeled
Fireglass 20

Docs & Downloads

Product Fact Sheet

CSI Format Specs

Product Comparison Chart

Watch Product Testing


  • Fire-rated for 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
  • Fits in Fireframes® Designer Series frames from TGP, or standard fire-rated frames
  • Large sizes available
  • Passes positive pressure test standards UL 10C
  • May be lightly sandblasted/etched on one side without affecting fire rating
  • For use in interior and exterior applications
  • Manufactured in U.S.A.
  • Available in insulated glass units (IGU) with other glass products, including (but not limited to):
    • Tinted
    • Low-E
    • Art Glass
    • Reflective
    • One-way mirror

Note: This product is not a barrier to radiant heat. This product does not meet test standards ASTM E-119 or UL 263. If your jurisdiction requires a "barrier to heat" product, please see Pilkington Pyrostop.


Classified and labeled by Underwriters Laboratories, Inc.® and Underwriters Laboratories of Canada. File number for labeled 20 minute fire-rated assemblies is R13377. Tests performed in accordance with CSFM 43.7, NFPA 252, UL 9 and UL 10B and UL 10C (WITHOUT HOSE STREAM TEST).

Rating Assembly Max. Exposed
Area (in2/ft2)
Max. Width
Of Exposed
Glazing (in)
Max. Height
Of Exposed
Glazing (in)
20 min.
Doors 3,204 / 22.25 36 89

Check with frame manufacturer for maximum tested glass sizes and required stop height.

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


All 20 minute fire-rated and impact safety-rated glass designated on the drawings shall be 1/4" (6 mm) thick Fireglass20.

As interpretation of building and fire codes may vary depending on locale, please consult your local authorities for the proper use of Fireglass20.

Please call Technical Glass Products for further information.


Request a sample kit.


Thickness: 1/4" (6 mm)
Min. Glass Size: 4-1/2" (must meet a 12" diagonal)
Weight: 3 lb/ft2
Approx. Visible Transmission: 89%
Approx. Visible Reflection: 8%
Fire Rating: 20 minutes (without hose stream test)
Impact safety-rated: Meets ANSI Z97.1 and CPSC 16CFR1201 (Cat. I and II)
STC Rating: 31

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.

Hardwood Series - 20/45/60 Minute Fire-Rated Doors & Frames

Designed for maximum durability and performance, the Hardwood Series offers an attractive alternative to traditional hollow metal frames. Available with fire ratings from 20 to 60 minutes, this system can incorporate a wide range of fire-rated glazing materials with glass sizes that surpass traditional systems.

Traditional Hollow Metal Steel Frames-Fire-Rated Doors & Frames

TGP glazing can be used in any approved fire-rated door and frame assemblies.

Storage & Handling

Fireglass20 must be handled with care during transportation, storage, inspection and installation. Store in a dry place.

Care & Warranty

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.

Failure to comply with these care and cleaning guidelines may result in loss of warranty.

Download a PDF of our Care & Warranty Brochure.

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