Firestop ________, in conjunction with steel wedging plates, go in a steel cable tray.

Firestop bags are flexible pouches filled with intumescent or ablative granular material that can be shaped around the irregular profiles of cable bundles within a steel cable tray. Steel wedging plates are installed on either side of the bags to compress and hold them firmly in position within the tray opening. Upon exposure to fire, the fill material expands or chars, effectively sealing the opening and maintaining the fire-resistance rating of the barrier the tray penetrates.

Firestop blocks are rigid preformed units suited to open conduit or cable tray ends in wall openings, and are not the designated product paired with steel wedging plates inside a cable tray.

Intumescent sheets are flat, wrap-style materials applied around cable bundles or within conduit openings at wall and floor penetrations, not the standard method used with wedging plates inside cable trays.

Silicone foams are applied as injectable or pour-in sealants within conduit or open penetrations in barriers, and are not designed to be paired with steel wedging plates in cable trays.