Pilkington Pyrostop (EI-glazing)

Pilkington Pyrostop® (EI-glazing)

Fire-resistant glass for situations and applications that need the highest level of reliable protection from fire, smoke and dangerous radiant heat

A range of fire-resistant glass types is available in offering increasing levels of classified protection, which is measured in defined time periods (30, 60, 90, 120 and 180 minutes) and in terms of Integrity and Insulation or Integrity only as designated by the European Standards. It should be noted that fire-resistant glass must always be specified as part of a tested and approved glazing system, and installation should be carried out by specialists in order to ensure that the expected fire performance achieved should be called upon.

Insulation : The ability of a specimen of a separating element to restrict the temperature rise of the unexposed face to below specified levels. Temperature rise on the unexposed fire side shall not be more than 140ºC (average value) or 180ºC (maximum individual value) above ambient temperature

Integrity : The ability of a specimen of a separating element to contain a fire to specified criteria for collapse, freedom from holes, cracks and fissures and sustained flaming on the unexposed face.

Fire Classification

These diverse regulations and requirements for the use of fire-resistant glazing have led to the definition of the European standardised fire-resistance performance classification which comprises three classes :

  • Class EI : Fire-resistant glass in this category offers highest level of protection from fire, smoke and radiant heat for a defined period of time.
  • Class EW : Glass in this category offers an integrity performance (protection from fire and smoke) whilst reducing transfer of dangerous radiant heat.
  • Class E : Fire-resistant glass which remains transparent in the event of fire offers protection from fire and smoke event of a fire (integrity only performance). 


  • Door systems
  • Windows/façade glazing
  • Shopfronts
  • Fixed glazing for interior and exterior applications
  • Horizontal system for fire protection
  • Totally clear
  • Allows natural light and transparency to unlock fire partitions and access areas
  • Protect the building structure
  • Provides escape corridors and protected access for fire fighters
  • Limit fire damage to property and valuables
  • Approved worldwide and glazed in a wide range of sizes
  • Excellent sound reduction properties
  • Available with short lead times
Production Specification
EI Class Fire resistance Glass type Recommended Maximum Sizes
Integrity Insulation Steel Frame
Doors Screens
30 30 15mm Pilkington PyrostopTM 30-10   Warres 62326
1320mm x
30 30 18mm Pilkington PyrostopTM 30-20 WFRA21962 Max w. Max h.
860mm x 2260mm
60 60 23mm Pilkington PyrostopTM 60-101 CF328p Warres 113978
Max area 1.79m2 1495mm x 2895mm
max w.1338mm  
max h.2280mm  
60 60 27mm Pilkington PyrostopTM 60-201 CF328p CF328p
Max area 4.13m2 Max area 4.13m2
max w.2000mm max w.2000mm
max h.3000mm max h.3000mm
90 90 44mm Pilkington PyrostopTM 90-100   CF328p
Max area 2.8m2
max w.1400mm
max h.2000mm
120 120 52mm Pilkington PyrostopTM 120-104   Warress 117011
1415mm x