What is the significance of the numbers in EI60, EI120, EI180?

The numbers (e.g., 60, 120, 180) indicate the duration in minutes for which the glass maintains its integrity and insulation properties under fire conditions, as tested according to relevant standards.

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Many multi-layered fire rated glass products inherently offer good acoustic performance due to their laminated structure, providing both fire and sound insulation benefits.
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.
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.