ASTM E 119 is commonly used to test the fire resistance of various building components and assemblies. Here are some examples of components and assemblies that are typically tested using ASTM E 119:

1. Walls: Different types of walls, such as load-bearing walls, curtain walls, and partition walls, are tested to evaluate their ability to resist the spread of fire.

1. Floors and Roofs: Structural floor and roof assemblies, including concrete slabs, steel decking, and composite systems, are tested to assess their fire resistance and ability to maintain structural integrity during a fire.

1. Columns and Beams: Structural columns and beams, made of materials like steel or concrete, are tested to determine their fire resistance and load-bearing capacity under fire conditions.

1. Fire Doors: Fire-rated doors and door assemblies, including frames, hardware, and glazing, are subjected to fire exposure to evaluate their ability to prevent the passage of flames and smoke.

1. Fireproofing Materials: Fire-resistant coatings, sprays, and insulating materials applied to structural elements, such as steel beams or columns, are tested to verify their ability to protect the underlying structure from the effects of fire.

1. Penetration and Joint Systems: Firestop systems, sealants, and other penetration or joint protection systems are tested to assess their ability to prevent fire and smoke from spreading through openings in fire-rated assemblies.

These are just a few examples, and there are many other building components and assemblies that can be tested using ASTM E 119. The specific components and assemblies chosen for testing depend on the building's design, construction materials, and the fire safety requirements of the project.