One of the benefits of GRP natural lighting is that in the event of fire, the roofing burns without dropping flaming particles into the structure which cause re-ignition. At the same time heat, fumes and smoke are ventilated and the roofing web remains draped between the purlins allowing only harmless particles to fall back into the building. In instances where safer egress is required in the event of fire, the addition of fire resin systems can be included to slow the spread of flame, reduce the amount of smoke and alter the flammability point of the roofing product. IDELITE FR addresses these requirements.

Key Benefits:

  • IDELITE FR is a glass reinforced polyester fire retardant sheeting that has been specifically formulated using fire retardant materials for use in commercial building applications and educational institutions to slow the spread of flames and to reduce the level of smoke
  • The sheeting allows the transmittance of natural light into the interior of the structure while providing fire retardance at minimal additional cost
  • IDELITE FR can be specified for any industrial and commercial building that requires compliance to provide safer aggress from a building in the event of fire


  • Schools and educational institutions
  • Public assembly areas
  • Combustible areas with high fire risk
  • Where egress from a building in the event of fire may be restrictive.

Special Applications

  • IDELITE-FR can be supplied tinted with variations to reduce light and heat transmission. This is recommended due to the long term clarity of the sheet.
  • IDELITE FR can be supplied with superior weather surface coating which has UV built-in inhibitors offering improved serviceable life


Sheets are sold by weight –kilograms per square meter – rather than thickness. As the sheet are made heavier (thicker) they become stronger.

The most popular range of weight (Grade) is 1730 g/m, 2100 g/m2, 2440 g/m2 and 3500 g/m2.anuther grades are also available upon request


IDELITE-FR is available in standard colors of Clear, White Tint, Opal, Blue and Blue green. Other colors are available on request to suit specific design applications.

Light and Heat Transmission:



Light        Heat

Blue green

Light        Heat


Light        Heat

White Tint

Light        Heat

1730g/m2 (1 mm)

85%         75%

79%         68%

71%         53%

46%         36%

2100g/m2 (1.2mm)

84%         70%

78%         67%

66%         53%

45%         35%

2440g/m2 (1.5mm)

82%         70%

78%         67%

66%         53%

45%         35%

3500g/m2 (2mm)

75%         68%

73%         67%

73%         50%

39%         32%

Light and heat transmission information is issued as a guide only and base on interpretation of natural exposure.


IDELITE-FR meets with the requirement of ASTM D 3841 (Standard specification for glass-fiber-reinforced polyester plastic panels) and BS 4154 part 1.

Operating Temperature:

The operating temperature range of Topglass is -40° to 110° C.

Anti Ultraviolet:

More than 99%


Do not walk on rooflights at any time. IDELITE panels are not intended to support the undistributed weight of workers. Roofing ladders or crawling boards or equivalent means of protection must be used during any work on roofs