PYRAN® Star

At a glance

PYRAN® Star is a transparent fire-rated glass-ceramic for architectural application produced using SCHOTT’s rolling process.

PYRAN® Star fire-rated glass-ceramics are certified by Underwriters Laboratories for fire-protection ratings up to 90 minutes in windows and 180 minutes in doors. For safety-rated applications, filmed and laminated versions are available.


General Characteristics

  • Transparent, wireless
  • Withstands thermal shock (hose-stream tested)
  • Approximate visible light transmission: 87 percent
  • Surface finish: Standard with a slight texture
  • Maximum sheet sizes: Approximately 77 x 43 inches
  • Suited for use with standard fire-rated frames with the same rating
  • Conforms to positive pressure test standards

Areas of application

Fire Door Lites

  • A Fire Door is the door component of a fire door assembly, that together with the frame, hardware and other accessories provide a specific degree of fire protection to the opening. Fire Doors are tested according to NFPA 252 or UL 10B or UL 10C and installed according to NFPA 80.
  • PYRAN® Star fire-rated glazing installed as vision panels in Fire Doors provides a clear view for occupants exiting the building in an emergency.
  • For Fire Door Lites installed in areas subject to human impact, PYRAN® Star F and PYRAN® Star L meet CPSC 16 CFR 1201 impact requirements.
  • PYRAN® Star in Fire Door Lites passes the required hose stream test and is fire-rated up to 180 minutes. It is permanently labeled D-H-90 or D-H-180.

Fire Window Glazing

  • Fire Windows are constructed and glazed to give protection against the passage of fire. Fire Windows are tested according to NFPA 257 or UL 9 and installed according to NFPA 80.
  • PYRAN® Star fire-rated glazing installed in Fire Windows remains clear during a fire and provides a clear view for occupants exiting the building in an emergency.
  • For Fire Windows installed in areas subject to human impact, PYRAN® Star F and PYRAN® Star L meet CPSC 16 CFR 1201 impact requirements.
  • PYRAN® Star in Fire Windows passes the required hose stream test and is fire-rated up to 90 minutes. It is permanently labeled OH-90.

Transoms, Sidelites and Borrowed Lites

  • Transoms and Sidelites are smaller glazed windows that may surround the Fire Door. Borrowed Lites are installed in interior walls to allow light from an adjacent room. Transoms, Sidelites and Borrowed Lites in Fire Rated walls are constructed and glazed to give protection against the passage of fire. These three special windows are tested as Fire Windows according to NFPA 257 or UL 9 and installed according to NFPA 80.
  • PYRAN® Star fire-rated glazing installed in Fire Windows remains clear during a fire and provides a clear view for occupants exiting the building in an emergency.
  • For Fire Windows installed in areas subject to human impact, PYRAN® Star F and PYRAN® Star L meet CPSC 16 CFR 1201 impact requirements.
  • PYRAN® Star in Fire Windows, including Transoms, Sidelites and Borrowed Lites passes the required hose stream test and is fire-rated up to 90 minutes. It is permanently labeled OH-90.

Product types

PYRAN® Star fire-rated glass ceramics are available in three product types:

All three product types are certified by Underwriters Laboratories for use in fire-rated windows. Both PYRAN® Star F and PYRAN® Star L meet CPSC impact requirements for safety-rated applications according to ANSI Z 97.1 and CPSC 16 CFR 1201 (Cat. I and II).

Technical data

Rating (Minutes) Location Max. exposed area of glazing (in²) Max. width of exposed glazing (in) Max. height of exposed glazing (in) Min. depth of glazing channel (in)

Applying for PYRAN® Star, PYRAN® Star F & PYRAN® Star L
Up to 90 Other than doors 3,202 76 76 5/8”
Up to 90 Doors temp rise 100 12 33 5/8”
Up to 90 Doors non-temp rise 2,736 36 76 5/8”

Applying for PYRAN® Star L
Up to 180 Doors temp rise / non-temp rise 100 12 12 1/2”

All fire tests performed in accordance with UL9, UL10B, UL10C, UBC7-2 (1997), UBC7-4 (1997), NFPA252, NFPA257, NFPA80, ASTME2010-01, ASTME2074-00, ULCCAN4-S104 and ULCCAN4-S106.

Note: This product is not considered a barrier to radiant heat and does not meet the ASTM E-119 or UL 263 test standards.
All listing information is subject to change. The current listing can be accessed in the UL directory under file #R22036 or upon request from SCHOTT.

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