Fire rated glass(which is often referred to as fire-resistant glass,fire protection glass,anti fire glass or fireproof glass) is a specialized glazing product designed to act as a barrier against fire, smoke, and heat transfer for a specified period, helping to contain a fire and allow safe evacuation.
These are European classifications: E (Integrity) means the glass prevents the passage of flames and hot gases. EW (Integrity & Radiation) means it prevents flames/hot gases and significantly reduces radiant heat. EI (Integrity & Insulation) means it prevents flames/hot gases and limits temperature rise on the unexposed side.
EN 13501-2 is the European standard for the fire classification of construction products and building elements, used to classify fire-rated glass based on its performance in fire resistance tests.