Firestop mortars are most typically used to firestop large openings in walls and floors required to have a fire-resistance rating. They are passive fire protection items subject to stringent bounding[citation needed]. Firestop mortars most often exhibit densities near 1kg/L. This makes the product easy enough to handle, yet heavy enough to absorb a lot of heat from penetrants, to keep the unexposed side of the assembly cool.
Firestop mortars differ in formula and properties from most other cementitious substances and cannot be substituted with generic mortars without violating bounding requirements.
 Firestop mortar, starts as a powder, is mixed with water, forms cement stone, dries hard, is often leavened with lightweight aggregates, such as perlite or vermiculite and pigmented to distinguish it from generic materials in an effort to prevent unlawful substitution and to enable verification of bounding{{#if:citation needed|[citation needed]|}}{{#if:||{{#if:Category:Articles with unsourced statements|[[Category:Articles with unsourced statements {{#if:September 2007|since September 2007}}]]}}}}. For instance, Nelson CMP is pigmented red and 3M Fire Barrier Mortar is pigmented blue for that purpose. |
 20kg bags of firestop mortar are mixed at once for immediate installation. |
 Firestopped cable tray penetration. The cables and the tray are penetrants. |
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 Cable tray cross barrier firestop test, full scale wall, in Germany as per DIN4102. |
 Positive displacement mixer/feeder firestop mortar pump. The premixed dry powder is dumped into the hopper and fed by a screw towards a rotor/stator assembly. To the left of the assembly, the dry powder is mixed with water by paddles welded to the feeder shaft. The resulting paste is then pulled and squeezed through the rotor/stator assembly and into the hose. |
 Detail from a fire test: Proven repair procedure for re-entry and resealing of firestop mortar. |
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