In the classification of fire glasses, there are three different markings.

E = It protects product integrity during flame resistance period.
W = It avoids certain radiation during period of radiation restriction.
I = It does not transmit the heat forming during period of isolation to the other side.

Glasses that are within EI30 class, avoid for the passage of flames, fume, toxic gases, radiant heat, and temperature completely for a period of 30 minutes.

Glasses that are within EI60 class, avoid for the passage of flames, fume, toxic gases, radiant heat, and temperature completely for a period of 60 minutes.

Glasses that are within EI90 class, avoid for the passage of flames, fume, toxic gases, radiant heat, and temperature completely for a period of 90 minutes.

Glasses that are within EI120 class, avoid for the passage of flames, fume, toxic gases, radiant heat, and temperature completely for a period of 120 minutes.

As Inter Cephe, we produce fire resistant glasses within classes of EI30, EI60, EI90, and EI120.