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.
Yes, some manufacturers offer decorative options, such as sandblasting or etching, on fire rated glass, provided these treatments do not compromise the glass's fire performance or certification.